TUV Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Water Audit Report
XXXXX One Building – Chennai, India
www.irepartners.com
IREP ENERGY & ASSET MANAGEMENT SERVICES
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
RESTRICTED - COMMERCIAL
Water Audit Report
For
XXXXX One, Chennai, India – Feb 2023
Prepared for
Prepared by
Mr. XXXXX
Hari Vignesh S
Certified Energy Auditor
Sr Engineer – Energy & Technical
XXXXXXXXXX
Certified Energy Auditor
For XXXXX One, Chennai, India
International Real Estate Partners
+91-98411-86158
hari.vignesh@irepartners.com
Survey Reference
IREP/2022/India/TUV-XXXXX/02
Country
India
Date
06-02-2023 & 08-02-2023
Report Status
Draft report
Prepared by
Checked by
Approved by
Hari Vignesh S
Suresh Kumar DK
John Weber
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Contents
1.
Executive Summary ..................................................................................................................... 4
2.
Site brief ........................................................................................................................................ 5
3.
Scope of Work.............................................................................................................................. 5
4.
List of Water Conservation Measures ...................................................................................... 6
5.
Monthly Water Consumption & Cost Trend for the year Jan22-Dec22 ............................ 7
6.
Water Network Diagram at XXXXX One ................................................................................. 9
7.
Water Management system at XXXXX One ......................................................................... 10
8.
Water Treatment plant at XXXXX One .................................................................................. 10
9.
Water Treatment plant at XXXXX One Observations & Recommendations .................. 11
10.
RO plant at XXXXX One ....................................................................................................... 11
11.
RO plant at XXXXX One Observations & Recommendations ....................................... 11
12.
STP plant at XXXXX One ...................................................................................................... 12
13.
STP plant at XXXXX One Observations & Recommendations ...................................... 14
14.
Water Balance Diagram at XXXXX One ............................................................................ 15
15.
Site Level Water Conservation Measures (WCMs) Opportunities: - ............................ 17
16.
Standards ................................................................................................................................ 29
17.
Annexure ................................................................................................................................. 30
18.
Proposed flow meter areas .................................................................................................. 31
19.
Standard Operating Procedure .......................................................................................... 32
20.
Awareness and Training on Water Savings ...................................................................... 34
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
1. Executive Summary
XXXXX One commercial office complex building located in Ambattur, Chennai, India is important for
Chennai office hub. The buildup area of the building is 1.9 Million sq ft
Baseline information and water conservation opportunities summary,
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
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✓
2022 Annual Raw Flush water consumption
2022 Annual Raw water consumption
2022 Annual Flush water consumption
2022 Annual water cost
Unit Raw water cost
Annual operating days considered.
Annual Water cooled chiller operating hours
Annual Water saving potential
Annual Water Cost saving potential
% Water reduction
% Water cost reduction
Overall investment required
Overall Return on Investment
=
=
=
=
=
=
=
=
=
=
=
=
=
1,41,647 kL
52,404 kL
89,243 kL
45,38,186 Rs.
86.8 Rs./kL
300 days.
3544 hours.
21,038 kL
18,21,920 Rs.
40.1%
40.1%
58,94,500 Rs.
3.2 years
Highlights of the Water Audit Report:
✓
Five individual Water Conservation Measures (WCMs) presented here have a total annual cost
savings potential is Rs. 18,21,920 with an investment of Rs. 73,94,500 i.e., with an attractive
payback of 4.1 Years. This will result in annual water savings of 21,038 kL at XXXXX One Chennai.
✓
Taken together, once implemented, the actions should lead to a reduction of 40.1% in the overall
Domestic Water consumption and 40.1% reduction in cost which translates into direct profit
improvement.
✓ There are 2 individual Water Conservation Measures (WCMs)
presented here have a total annual water cost savings potential of Rs.
1,19,934 with no investment i.e., Immediate payback.
Water Performance Index (WPI) : Liter/Person/Day
Below is the baseline water consumption, present Water Performance Index, and post WCM project
implementation optimized Water Use Intensity, WPI is optimized from current 66.4 Liter/Person/day to
56.5 Liter/Person/day which implies significant water performance improvement is possible.
Metrics
Annual Raw + Flush Water Consumption
(Year Jan 2022-Dec 22)
Expected Annual Raw Water savings
Average Annual foot fall count
Unit
Total Built up area
Value
kL
1,41,647
kL
Nos
21,038
21,34,675
Million Sq ft
1.9
Present Water Use Intensity (WUI)
Liter/Person/day
66.4
Optimized Water Use Intensity (WUI)
Liter/Person/day
56.5
WPI
66.4
WPI = 65.7
WPI
56.5
WPI = 64.6
26.37
Good
Housekeeping
HVAC, Water, STP
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Ceramic
Filtration
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
2. Site brief
This report presents the results of Water audit at XXXXX One, Chennai.
The agreed objectives of the assessment were:
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✓
To identify and prioritize actions that can be taken by the organization to improve water
management effectiveness.
To identify and prioritize actions that can be taken by the organization at site level to reduce water
costs and move towards zero liquid discharge (ZLD).
Whilst XXXXX one have made initiated many water conservation initiative in progress and in incorporating
water efficiency at design stage, XXXXX One has requested specific support to:
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✓
Identify additional water saving opportunities that can reduce their water bill / ZLD.
Identify standard water saving opportunities that can be implemented.
XXXXX one had agreed to accelerate the water management program with an overall effective water
management planning.
To start with, During onsite water assessment on 6th to 8th Feb 2022, we thank you for the support while
sharing the necessary information through-out the detailed water audit process. We are pleased to outline
the audit findings.
3. Scope of Work
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✓
✓
✓
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✓
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✓
✓
Development of Water Circuit Flow Diagram (using PPT) for the entire complex showing
locations of reservoir tanks and pumps etc.
Collection compilation of basic data of pumps rated details, operating hours of pumps,
reservoirs/tanks capacities etc.
Measurements of Flow Pressure and Power at major operating pumps
Performance Assessment of Pumps in terms of actual v/s rated efficiency
Identification of inefficient pumps
Preparation of Water Balance Diagram (using PPT)
Study of existing Water Distribution system Estimation of associated losses
Evolving recommendations on water conservation cost reductions
Suggestions for reduction, reuse, recycling, regeneration recharging options for water
conservation with cost benefit analysis and the required investment.
Provide details on Rainwater Harvesting (Potential for the given site and suggest possible
RWH schemes)
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TUV Water Audit Report
XXXXX One-Chennai, India
Feb-2023
4. List of Water Conservation Measures
List of Water Conservation Measures (WCM) Identified at XXXXX ONE- Chennai
Estimated Annual
Estimated
Water savings
Investment
WCM
Description
no.
Water,
Rs.
Rs.
m3
A. No investment proposals (Immediate Payback)
WCM 1: Arrest the water leaks at identified location to save water and
1
367
31,800
NIL
energy cost
2
WCM 2: Reduce the makeup water consumption by maintaining the
COC from 2.6 to 3.5 in CT-3
Return On
Investment
Immediate
Good
housekeeping
Good
housekeeping
1,018
88,134
NIL
Immediate
1,385
1,19,934
NIL
Immediate
1,740
1,50,664
2,00,000
1.3
720
62,352
1,94,500
3.1
2,460
2,13,016
3,94,500
1.9
17,194
14,88,971
55,00,000
3.7
SUB TOTAL - C
17,194
14,88,971
55,00,000
3.7
OVERALL TOTAL (A + B + C)
21,038
18,21,920
58,94,500
3.2
SUB TOTAL - A
Category
Years
B. Low/Medium investment proposals (Payback between 1-2.5 years)
3
WCM 3: Segregate low TDS AHU condensate water from STP line to use
for Cooling tower makeup line to reduce domestic water consumption
and cost
4
WCM 4: Convert Common area Gents and Ladies Restroom Manual
Handwash Taps and Urinals to Sensor based system to reduce water
consumption
SUB TOTAL - B
C. Medium/high investment proposals (Payback >2.5 years)
5
WCM 5: Recover Cooling tower blowdown, RO reject, UF 1&2
backwash, STP & WTP backwash and treat using new UF & RO system
for Cooling tower makeup water
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Limitations of the report
✓
✓
✓
Report is prepared based on the site operation for the year Jan 2022-Dec 22.
Annual water cost considered 86.6 Rs./kL
Annual Chiller operation hours 3544 hr/annum
5. Monthly Water Consumption & Cost Trend for the year Jan22-Dec22
Table 1 Monthly Water consumption & cost trends for the Year Jan22-Dec22.
Month
Raw Water purchased
kL
Raw Water Cost
Rs.
Flush water consumption
kL
Occupancy
Nos
Water Cost,
Rs./KL
Jan-22
2,376
2,05,762
5,653
68,801
86.6
Feb-22
2,880
2,49,408
4,142
64,627
86.6
Mar-22
3,684
3,19,034
7,336
1,39,839
86.6
Apr-22
4,140
3,58,524
7,245
1,63,117
86.6
May-22
4,440
3,84,504
8,287
1,87,623
86.6
Jun-22
4,584
3,96,974
7,778
2,04,904
86.6
Jul-22
5,652
4,89,463
8,066
1,98,199
86.6
Aug-22
4,872
4,21,915
8,624
2,11,462
86.6
Sep-22
5,136
4,44,778
7,883
2,22,850
86.6
Oct-22
4,572
3,95,935
7,766
2,12,044
86.6
Nov-22
4,776
4,13,602
8,007
2,33,715
86.6
Dec-22
5,292
4,58,287
8,457
2,27,494
86.6
52,404
45,38,186
89,243
21,34,675
86.6
TOTAL
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
52,404,
37%
Raw water
Flush water
Raw water & Flush in kL
89,243,
63%
10,000
8,000
6,000
4,000
2,000
0
600,000
500,000
400,000
300,000
200,000
100,000
0
Raw water
Flush
Raw water cost
Raw water cost in Rs.
Water consumption Vs Cost, Occupancy
Water Share
Occupancy
*Note:
1.The Average Specific Water Consumption is arrived by the formula [Liters/Person] = (Raw water + Flush water) [Liter]
Occupancy [Person]
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TUV Water Audit Report
XXXXX One-Chennai, India
Feb-2023
6. Water Network Diagram at XXXXX One
Recycled STP treated water
Usage
Raw water Usage
Tanker
water
purchased
Cooling
Tower
makeup
RO
Inlet
Mobile
rest
room
RBS
Low rise
Domestic
RBS
High rise
Domestic
Food
court
Total Flush
water
consumption
RBS
High
rise
Flush
RBS
Low rise
Flush
kL
kL
kL
kL
kL
kL
kL
kL
kL
kL
Jan-22
2,376
927
88
14
1,531
590
75
5,653
275
0*
Feb-22
2,880
1,133
126
22
1,150
417
75
4,142
162
0*
Mar-22
3,684
1,699
152
35
2,203
530
81
7,336
793
0*
Apr-22
4,140
1,625
144
26
2,351
618
101
7,245
456
0*
May-22
4,440
1,605
170
20
727
536
81
8,287
532
0*
Jun-22
4,584
1,817
191
31
746
315
111
7,778
313
0*
Jul-22
5,652
1,663
229
36
169
383
155
8,066
590
0*
Aug-22
4,872
1,290
346
46
733
286
170
8,624
610
0*
Sep-22
5,136
1,461
305
44
2,706
233
251
7,883
466
0*
Oct-22
4,572
1,175
128
31
616
208
178
7,766
385
0*
Nov-22
4,776
1,238
209
56
0*
346
211
8,007
462
0*
Dec-22
5,292
1,281
242
32
0*
292
260
8,457
647
0*
TOTAL
52,404
16,914
2,330
393
12,932
4,754
1,748
89,243
5,692
0
Month
Note: 0* indicates the meter has become faulty for the particular duration based on XXXXX One Historic data
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
7. Water Management system at XXXXX One
The major water consumers contributing to the facility consumptions are Domestic, Flush, Cooling tower
makeup, Ro plant, Cleaning, Gardening, WTP, UF 1& 2 Backwash.
The Water is being purchased from tanker water supplied by two vendors locally, the Raw water purchased
is stored in storage tank at Basement Floor.
Automatic Hydro Pneumatic water transfer pumps used to transfer the water from basement tank to all end
users through automatic pressure based hydro pneumatic pumping.
Building used water to be treated with the help of 510 KLD Sewage Treatment Plant (STP) and STP treated
water is pumped for flushing and for landscaping.
In the year Jan’22 – Dec’22, XXXXX Domestic water consumption is 52,404 kL and cost spent on
45,38,186 Rs. per annum and at an average water charge per m3 is 86.6 Rs/kL.
Table 2 Monthly Water consumption source wise & cost trends for the Year Jan22-Dec22.
Source 1
Source 2
Source 3
Borewell
water
Municipal
water
Tanker water
Jaya Murugan
No of 12 kL
No of 24 kL
tankers
tankers
Nos
Nos
K.K. Water
No of 12 kL
No of 24 kL
tankers
tankers
Nos
Nos
Raw Water
purchased
in kL
Raw Water
Cost,
Water
Cost,
Recycled
water
Rs.
Rs./KL
kL
kL
Flush water
consumption
kL
99
0
99
0
2,376
2,05,762
86.6
0
0
5,653
120
0
120
0
2,880
2,49,408
86.6
0
0
4,142
153
0
154
0
3,684
3,19,034
86.6
0
0
7,336
158
0
181
3
4,140
3,58,524
86.6
0
0
7,245
168
0
202
0
4,440
3,84,504
86.6
0
0
8,287
174
0
208
0
4,584
3,96,974
86.6
0
0
7,778
220
0
251
0
5,652
4,89,463
86.6
0
0
8,066
184
0
222
0
4,872
4,21,915
86.6
0
0
8,624
198
0
230
0
5,136
4,44,778
86.6
0
0
7,883
192
0
189
0
4,572
3,95,935
86.6
0
0
7,766
171
0
227
0
4,776
4,13,602
86.6
0
0
8,007
216
0
225
0
5,292
4,58,287
86.6
0
0
8,457
2,053
0
2,308
3
52,404
45,38,186
86.6
0
0
89,243
8. Water Treatment plant at XXXXX One
✓
✓
✓
✓
✓
✓
✓
XXXXX One have installed one water treatment plant consisting of Pressurized Sand Filter (PSF) and
Activated Carbon Filter (ACF) and water is sent to final treated water tank.
Note: There is no softener installed
Automatic Hydro Pneumatic water transfer pumps used to transfer the water from basement treated
water tank and flush tank for Domestic and Flushing purpose to all end users through automatic
pressure based hydro pneumatic pumping.
For Domestic water pumping the Hydro-pneumatic pumps are set at 5 bar for low rise level which is
from B2 level to 6th floor in all three towers A,B& C
For Domestic water pumping the Hydro-pneumatic pumps are set at 7 bar for low rise level which is
from 7th floor to Terrace in all three towers A,B& C
For Flush water pumping the Hydro-pneumatic pumps are set at 5 bar for low rise level which is from
B2 level to 6th floor in all three towers A,B& C
For Flush water pumping the Hydro-pneumatic pumps are set at 7 bar for low rise level which is from
7th floor to Terrace in all three towers A,B& C
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
The Efficiency of Domestic High and Low rise, Flush High rise and Low rise pumps were
done and refer below table for efficiency
Location
Low Rise Flush-8
Low Rise Domestic-4
High Rise Domestic-1
High Rise Flush-6
Set Pressure
Date
Trail time
5 bar
5 bar
7 bar
7 bar
07-02-2023
07-02-2023
08-02-2023
08-02-2023
30 minutes
29 minutes
19 minutes
12 minutes
Energy
consumed
kWh
1.63
0.56
2.24
0.27
Water
Utilized
kL
7.0
3.0
5.0
1.0
SEC of HNP
0.23
0.19
0.45
0.27
9. Water Treatment plant at XXXXX One Observations & Recommendations
S.no
1
2
Observation
Hardness of Raw water is 383 ppm
which is on higher side, and there
is no softener plant installed at
XXXXX one
Identified Pumps were operating at
<72%
Recommendation
Photo
It is recommended to install
Softener to reduce the hardness
of raw water
Ref test report
in Annexure
Replace the pumps with energy
efficient pump for energy savings
General
observation
Measured Values
Description
Voltage
Current
Power
Power factor
Motor Efficiency
Frequency
Measured flow
Suction Pressure
Discharge Pressure
Total Head
Operating Pump Efficiency
Unit
WTP Filter feed pump
Volt
Ampere
kW
PF
421
13.7
9.1
0.90
83.2
50
46.3
0.30
4.60
43.0
72
ηmotor%
Hz
m3/hr
kg/cm2
kg/cm2
meter
η%
10. RO plant at XXXXX One
XXXXX One have installed one RO treatment plant of 4.5m3/hr for Drinking purpose.
11. RO plant at XXXXX One Observations & Recommendations
S.no
1
2
Observation
RO inlet water TDS is ~900 ppm, RO reject is 1450
ppm. RO product flow is 3.4 kL/hr and reject is 3
kL/hr average operating hour of RO plant is
1hr/day for 365 days
Recommendation
RO reject water is
recoverable and be used
for cooling tower after
proper treatment
Identified Pumps were operating at <39%
Replace the pumps with
energy efficient pump for
energy savings
IREP ENERGY & ASSET MANAGEMENT SERVICES
Photo
Process
improvement
General
observation
11
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Measured Values
Description
Voltage
Current
Power
Power factor
Motor Efficiency
Frequency
Measured flow
Suction Pressure
Discharge Pressure
Total Head
Operating Pump Efficiency
Unit
RO high Pressure pump
RO Filter feed pump
Volt
Ampere
kW
PF
Hz
394
6.3
3.8
0.86
88.0
50
389
4.0
2.3
0.86
83.2
50
m3/hr
8.0
8.0
kg/cm2
kg/cm2
meter
η%
1.00
7.00
60.0
39
0.10
2.50
24.0
27
ηmotor%
12. STP plant at XXXXX One
XXXXX one have installed one Sewage Treatment Plant (STP) of 510 kLD Moving Bed Bio-Film Reactor
(MBBR) which is recently retrofitted from existing SBR system.
After Aeration and settling tank the pre treated water is filtered through PSF and ACF and sent to treated
water tank
STP have also installed with two Ultra Filtration system with capacity of UF1 (310 kLD) & UF2 (510 kLD) for
final treatment of STP treatment water, where treated water is pumped and Ultra filtered and stored in flush
tank and this water is used for Flushing and Gardening purpose.
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
13. STP plant at XXXXX One Observations & Recommendations
S.no
1
2
Observation
Soil well chamber design capacity (86
kL) is not adequate for present STP
inflow, not able to maintain the
retention time there by quality of
treated STP water is reduced and foul
smell is observed.
UF outlet water and inlet water clarity
remains the same, possibility for
membrane puncture is like to be there.
Need to check the membrane condition
and revamp the system thereby
improve the water quality.
Note: As per UF1 membrane design
spec: effective membrane area 64m2
per membrane, as a thumb rule 64x35
L/m2/hr = 2.5 m3/hr/membrane. total
6 membrane = 13. 44 m3/hr is the
maximum possible but actual measured
flow 14.5 to 17 m3/hr which is sign of
membrane puncture. It was observed
membrane failure recently and the
present one was replace 6 months ago,
but still UF is not performing well
Recommendation
Photo
Additional collection
tank shall be
arranged at
Basement
General observation
Segregate the UF
backwash water
separately from the
exiting line which is
to the Pre filtration
tank. Which is
increasing the TDS
concentration of
STP system
UF backflush water is being sent to prefiltration tank-Not a good engineering
practice
Segregate the UF
backwash water
separately from the
exiting line which is
to the Pre filtration
tank. Which is
increasing the TDS
concentration of
STP system
Process improvement
4
No chemical cleaning at UF filter is
done
Use generic low cost
and safe handling
acid like citric acid
to clean the filter
membrane
Process improvement
5
Identified Pumps were operating at
<45%
Replace the pumps
with energy
efficient pump for
energy savings
General observation
3
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
14. Water Balance Diagram at XXXXX One
Name - Water Source
Water Source
kL/yr
Bore Well
Tanker Source 1
Tanker Source 2
Other Source
Municipal water
Rain water
Recycled STP water
0
24,636
27,768
0
0
0
Total
1,41,647
89,243
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Area of Use
Domestic
Flushing
Cooling Tower
WTP Back Wash
UF 1& 2 Back Wash
Garden
Ro Plant
Food court
Usage kL/yr
Water
Usage
(%)
19,513
84,984
16,914
3,431
8,468
4,259
2,330
1,748
1,41,647
14%
60%
12%
2%
6%
3%
2%
1%
100%
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Sources of water % 2022
Bore Well
0%
Tanker Source 1
17%
Bore Well
Tanker Source 1
Tanker Source 2
Other Source
Tanker Source 2
Municipal water
20%
Recycled STP
water
63%
Rain water
Rain water
0%
Other Source
0%
Recycled STP water
Municipal water
0%
Section wise water consumption in kL, 2022
UF 1& 2 Back
Wash
6%
Garden
3%
Ro Plant Food courtDomestic
14%
2%
1%
Domestic
WTP Back Wash
2%
Flushing
Cooling Tower
WTP Back Wash
UF 1& 2 Back Wash
Cooling Tower
12%
Garden
Ro Plant
Food court
Flushing
60%
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
15. Site Level Water Conservation Measures (WCMs) Opportunities: WCM-01
Arrest the water leaks at identified location to save water and energy cost
Water Savings
(kL/year)
Cost Saving
(Rs.)
367
31,800
Details
•
Rational
•
•
•
•
•
•
•
•
Risk
Not identified.
Next step
•
•
•
Energy saving
(kWh)
66
Investment
(Rs.)
Nil
ROI
(Years)
Immediate
Direct water leaks that are drained and let outside the building can be arrested to avoid
the raw water consumption
Identified are the locations of water leaks
Domestic water line to UF-2 Pump priming line
Jockey pump hydrant line
Inlet line to Pr monitoring header
WTP filter feed pump seal leak
WTP pump beside Pr gauge ball valve passing
WTP discharge line (inlet line to filter)
It is proposed to arrest all the identified leaks to reduce the raw water consumption and
reduce the water cost.
Explained to operation team.
Implement the proposal by the vendor/OEM support verify the water savings.
Monitor and control the energy consumption
IREP ENERGY & ASSET MANAGEMENT SERVICES
17
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Backup Calculation: -
WCM 1: Arrest the water leaks at identified location to save water and energy cost
Description
Unit
Formula
Domestic
water
line to
UF-2
pump
Sampling volume
Sampling time
Water quantity leak
lost
Water quantity leak
lost
Water quantity leak
lost
Annual operating days
Annual Domestic water
savings
Total Annual Domestic
water savings
Domestic water cost
Annual water cost
savings
Makeup water cost
pumping SEC
Proposed power
savings in makeup
water pumping system
Annual operating
hours
Annual energy savings
Electricity cost
Recurring annual cost
savings
One-time cost of
implementation
Payback period
ml
sec
A
B
220
30
10
30
20
30
50
10
WTP
pump
beside
Pr
gauge
ball
valve
passing
15
30
ml/sec
C=A/B
7.33
0.33
0.67
5.00
0.50
0.33
l/hr
D=C*60*60/
1000
26.4
1.2
2.4
18
1.8
1.2
l/day
E=D*24
634
29
58
432
43
29
days
F
300
300
300
300
300
300
m3/year
G=E*F
190
9
17
130
13
9
kL/year
H=SUM(G1:G6)
367
Rs/kL
I
86.6
Rs/year
J=H*I
31,800
kW/m3/hr
K
0.18
kW
L=K*(H/8760)
0.0075
hours
M
8,760
kWh
Rs./kWh
N=L*M
O
66.1
9.08
Rs.
P=N*O
600
Rs.
Q
0
Years
R=Q/P
Immediate
IREP ENERGY & ASSET MANAGEMENT SERVICES
Jockey
pump
hydrant
line
leak
Inlet line
to Pr
monitoring
header
WTP
Filter
feed
pump
seal
leak
18
WTP
pump
discharge
line (inlet
line to
filter)
10
30
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
WCM-02
Reduce the makeup water consumption by maintaining the COC from 2.6 to 3.5 in CT-3
Water Savings
(kL/year)
Cost Saving
(Rs.)
1,018
Details
88,134
•
•
•
•
•
Energy saving
(kWh)
0
Investment
(Rs.)
Nil
ROI
(Years)
Immediate
XXXXX one has four cooling tower for four water cooled chillers, with two of capacity
357.5 TR and two of capacity 306 TR commissioned on 2009
Chiller 3 & 4 of 306 TR are operational and Chiller 1& 2 are not operated
Four cooling towers – CT 1 & 2 are BAC make cross flow cooling tower, which is not in
operational. CT-3 & 4 of Paharpur make Induced counter flow is used for chiller 3 & 4
of 306 TR.
During audit chillers 3 & 4 were in operation and CT 3 was in operation.
CT performance study was done on CT3
Rational
•
•
•
Risk
Not identified.
Next step
•
•
It is observed the sump TDS is 2,310 ppm and makeup water is 890 ppm
COC of CT 3 is 2.6
It is proposed to operate the cooling tower blow down set point from existing 2000
ppm to 3100 ppm with COC 3.5, thereby reducing the makeup water consumption
Discussion with facility manager and implement by vendor/OEM support.
Monitor the parameters and energy consumption to be achieved.
Cooling Tower 3
IREP ENERGY & ASSET MANAGEMENT SERVICES
Cooling Tower 4
19
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Cooling tower 3 Makeup, Evaporation and Blow down losses Calculation.
Description
Unit
Tag No. / ID
Year of Installation
CT Type
CT Material
Total no. of cells (Installed/Operating)
Ambient Dry Bulb temperature
nos
o
C
CT 3 Actual
Utility block
terrace
CT3
2008
ID Counter flow
FRP
4
32.0
Location
Ambient Web Bulb temperature
o
C
25.0
Hot water temperature
o
C
30.1
Cold water temperature
o
C
28.5
Range
o
C
1.55
C
nos
ppm
ppm
3.5
4
2,310
890
2.6
644
161.0
1.527
0.957
2.484
9,98,200
31%
CT 3 Actual
36.7
23.0
59.6
Approach
Total no. of fans (Installed/Operating)
Supply Water TDS
Make UP water TDS
COC
Total Circulation rate of CT
Circulation rate/cell
Evaporation loss
Blow down loss
Make-up
Heat Load of CT
Effectiveness
m3/hr
m3/hr
m3/hr
m3/hr
m3/hr
kcal/hr
%
Evaporation loss
Blow down loss
Make-up
m3/day
m3/day
m3/day
IREP ENERGY & ASSET MANAGEMENT SERVICES
o
20
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Backup Calculation: -
WCM 2: Reduce the makeup water consumption by maintaining the COC from 2.6 to 3.5 in CT-3
Description
Sump water TDS
Makeup water TDS
Measured COC
Measured Condenser water circulation flow in CT3
Measured Condenser water inlet temperature in CT3
Measured Condenser water outlet temperature in CT3
Present Calculated Evaporation loss water quantity
Present Calculated Blow down loss water quantity
Proposed COC
Proposed Calculated Blow down loss water quantity
Reduction in Blowdown water quantity
Annual operating hours
Annual Domestic water savings
Domestic water cost
Annual water cost savings
One-time cost of implementation
Payback period
IREP ENERGY & ASSET MANAGEMENT SERVICES
Unit
ppm
ppm
m3/hr
°C
°C
m3/hr
m3/hr
m3/hr
m3/hr
hours
m3/year
Rs/kL
Rs/year
Rs.
Years
Formula
A
B
C=A/B
E
F
G
E=0.00085*1.8*E*(F-G)
F=E/(C-1)
G
H=E/(G-1)
I=F-H
J
K
M
N
O
P=O/N
CT 3
2,310
890
2.6
534
30.05
28.50
1.266
0.794
3.5
0.507
0.287
3,544
1,018
86.6
88,134
0
Immediate
21
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Segregate low TDS AHU condensate water from STP line to use for Cooling tower
makeup line to reduce domestic water consumption and cost
WCM-03
Water Savings
(kL/year)
1,740
•
Details
•
•
•
Rational
•
•
Cost Saving
(Rs.)
Energy saving
(kWh)
Investment
(Rs.)
1,50,664
0
2,00,000
ROI
(Years)
1.33
XXXXX one has installed total of 105 no of AHUs of different capacities ranging from 32 to
110 TR totaling up to 5577 TR
On an average 66 no of AHU with total of 63% of total TR loading is in operational
Trails on one 40TR AHU was done to estimate the condensate water flow rate which is
250ml for 30sec equating to 30 liter/ hr
It is proposed to utilize this low TDS and low hardness water for cooling tower makeup
which can bring down the inlet tanker water consumption with some changes in the existing
system.
Currently XXXXX one is utilizing this condensate water which is connected to the Soil well
chamber.
It is proposed to Isolate this line from the STP system and use a dedicated system closed
loop system, usable for cooling tower makeup
Risk
No risk identified.
Next step
Discussion with Facility Management team and implement by vendor/OEM support
Monitor and control the parameter and water consumption throughout the year.
Backup Calculation: -
WCM 3: Segregate low TDS AHU condensate water from STP line to use for Cooling tower makeup line to reduce
domestic water consumption and cost
Description
Sampling AHU/AC TR capacity
Sampling volume
Sampling time
Water quantity recovery/reuse potential
Water quantity recovery/reuse potential
Water quantity recovery/reuse potential
Specific water recovery/reuse potential
Total no of AHU/AC installed
Total installed AHU TR capacity
Average operation percentage of AHU/AC unit
Water recovery potential (Considered Diversity
factor=0.186)
Annual operating days
Annual Domestic water savings
Total Annual Domestic water savings
Domestic water cost
Annual water cost savings
One-time cost of implementation
Payback period
IREP ENERGY & ASSET MANAGEMENT SERVICES
Unit
Formula
TR
ml
sec
ml/sec
l/hr
l/day
l/day/TR
nos
TR
%
A
B
C
D=B/C
E=60*60/1000
F=E*11.8
G=F/A
H
I
J
AHU 3
condensate
40
250
30
8.33
30
354
9
105
5,577
63
kl/day
K=(I*J%*G*0.186)/1000
5.8
0.02
days
m3/year
m3/year
Rs/kL
Rs/year
Rs.
Years
L
M=K*L
N=SUM(M1:M2)
O
P=N*O
Q
R=Q/P
300
1,735
300
5
Split AC
1,740
86.6
1,50,664
2,00,000
1.33
22
2
100
303
0.33
1.2
14
7
6
12
100
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
WCM-04
Convert Common area Gents and Ladies Restroom Manual Handwash Taps and Urinals to
Sensor based system to reduce water consumption
Water Savings
(kL/year)
720
•
Details
•
Rational
•
Cost Saving
(Rs.)
Energy saving
(kWh)
Investment
(Rs.)
62,352
106
1,94,500
ROI
(Years)
3.1
XXXXX One has common area wash room for Gents and Ladies with manual and sensor
based taps.
Study was conducted in manual taps to arrive the water flow rate in LPM
It is proposed to change only the manual taps to sensor based taps to save on domestic
water consumption
Risk
No risk identified.
Nest step
Discussion with FM team and implement by vendor/OEM support.
Monitor and control the parameter and water consumption throughout the year.
Manual Tap
Manual Tap
Manual Urinal flush
Sensor taps at XXXXX One
IREP ENERGY & ASSET MANAGEMENT SERVICES
23
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Backup Calculation: -
WCM 4: Convert Common area Gents and Ladies Restroom Manual Handwash Taps and Urinals to Sensor
based system to reduce water consumption
Gents
Ladies
Gents
Description
Unit
Formula
Handwash
Handwash
Urinal
Taps
Taps
Total number of Taps/Urinals in Manual system
No
A
14
9
5
Average operating hours of each tap per day
hr/day/tap
B
0.5
0.5
0.5
Present Measured water flow rate on manual
LPM
C
6.0
4.0
6.0
tap (on sampling basis)
Proposed Water flow rate on sensor tap
LPM
D
2.5
2.5
2.5
Water saving per tap
LPM
E
3.5
1.5
3.5
Annual operating days
days
F
300
300
300
Annual Domestic water savings
kL/year
G=E*F
441
122
158
Total Annual Domestic water savings
kL/year
H=SUM(G1:G6)
720
Domestic water cost
Rs/kL
I
86.6
Annual water cost savings
Rs/year
J=H*I
62,352
Makeup water cost pumping SEC
kW/m3/hr
K
0.18
Proposed power savings in makeup water
kW
L=K*(H/8760)
0.0148
pumping system
Annual operating hours
hours
M
7,200
Annual energy savings
kWh
N=L*M
106.5
Electricity cost
Rs./kWh
O
9.08
Recurring annual cost savings
Rs.
P=N*O
967
One-time cost of implementation
Rs.
Q
1,94,500
Payback period
Years
R=Q/P
3.1
WCM –
05
Recover Cooling tower blowdown, RO reject, UF 1&2 backwash, STP & WTP backwash and treat
using new UF & RO system for Cooling tower makeup water
Water
Savings
(kL/year)
Cost Saving
(Rs.)
17,194
14,88,971
Details
•
Rational
•
•
•
•
•
•
•
•
•
•
•
•
Proposal
Energy saving
(kWh)
•
-
Investment
(Rs.)
55,00,000
ROI
(Years)
3.7
XXXXX one has one WTP, Water cooled chiller plant & cooling tower, UF 1 & 2 in STP 510 kLD
MBR system for which Domestic water is used for back wash.
WTP backwash is drained out of the building – XXXXX one
UF 1& 2 backwash is drained out of the building – XXXXX one
Cooling tower blowdown water is drained out of the building– XXXXX one
RO plant reject water is drained out of the building -– XXXXX one
All the water that is let out of the building – XXXXX one is recoverable and can be reused after
proper water treatment with new technology in place.
Quantification of all the water was done during the water audit which are as follows
Cooling tower blowdown at 0.957 m3/hr at TDS 2310 ppm at 9.7 hrs/day
RO plant reject 3 m3/hr at TDS 1560 ppm at 1 hrs/day
UF 1 & 2 backwash at (14.4+14.6)= 29 m3/hr at TDS 1600 ppm at 0.8 hrs/day
STP backwash at 51.6 m3/hr at TDS 2100 ppm at 0.8 hrs/day
WTP backwash at 9.4 m3/hr at TDS 890 ppm at 1 hr/day
It is recommended to install Ceramic filters to treat above mentioned drain water and reduce the
TDS to <100 ppm with 65% recovery rate and use it for cooling tower purpose
Based on recommendation the water quality test for all the water mixed was done (RO reject,
UF1 & 2 backwash, Cooling tower blow down, STP backwash, WTP backwash, STP UF outlet )
IREP ENERGY & ASSET MANAGEMENT SERVICES
24
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Refer to below table for water quality parameters
•
•
It is proposed for installation of 120 kLD / 5 kLPH Pipe Flocculator, Settling tank, & Ceramic UF
filter for mixed waste water
•
The treated water from STP cooling tower blowdown, R.O reject from drinking water R.O,
Backwash water of filters from WTP,STP, UF1,UF2, from the collection tank is pumped to pipe
flocculation system where coagulant & flocculant is dosed due to the turbulence inside the pipe
flocculation system flocs formed will overflow into a intermediate settling tank where it has tube
settler media to separate solids & liquids, the settled sludge is bleed out at regular intervals, the
overflow from settling tank flows into ceramic membrane tank where it has very short retention
time in which it will remove all parameters in the effluent and the outlet water will have turbidity
less than <1 NTU
•
The treated water is then passed in R.O For Recovery to topped up in cooling tower
Raw water parameter: Design
•
BOD
Mg/l
100
•
COD
Mg/l
300
•
TSS
Mg/l
250
Treated Effluent our of Ceramic filter.
Parameter
Unit
Results
•
BOD
Mg/l
< 30 mg/l
•
COD
Mg/l
<100 mg/l
•
TSS
Mg/l
<5ppm
•
3 KL/Hr permeate Waste recovery R.O System For Cooling Tower
•
The reject which is from drinking water R.O, cooling tower blowdown,UF1&II , WTP&STP
Backwash & Flush tank water is collected in horizontal HDPE/FRP tanks is passed through
Ceramic UF & then passed to recovery R.O in which it has 65%-70% recovery with first of its kind
fouling resistant membrane
Feed Flow : 5 KL/Hr
•
Recovery 65%-70% = 3-3.5 KL/HR @ <100 TDS (inlet TDS upto 5000ppm)
•
Reject 35%-30% =2-1.5 KL/HR will be sent down to drain
•
Total feed quantity : 120 KL/D
•
Recovery : 70-80KLD
Design Raw water quality
Parameter
pH
Hardness
TDS
Silica
Unit
7.5-8.5
Mg/l
Mg/l
Mg/l
Design
900
3000-7000
<100
IREP ENERGY & ASSET MANAGEMENT SERVICES
25
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Treated parameters out of Reject Recovery R.O
Parameter
Unit
Design
pH
6.5-8.0
Hardness
Mg/l
<10
TDS
Mg/l
<100
Silica
Mg/l
<5
Risk
Not Identified
Next
step
Obtain the supplier quotations & Design review with engineering team
Post commercial approval; implement the project and verify water savings
Schematic of Ceramic UF Based STP
Chemical Dosing
Collection
Tank
P
Pipe
Floccul
ator
Primary
tube
settler
P
Ceramic
UF Skid
To end Use
Sludge to
drain
WTP back wash 3,431 kL
UF 1 & 2 back wash 8,468 kL
RO Reject 1,081 kL
CT blow down 3,388 kL
Water recovery
28,752 kL
Ceramic
filter &
RO with
65%
recover
y
Water recovery
17,194 kL
STP Backwash 12,384 kL
IREP ENERGY & ASSET MANAGEMENT SERVICES
26
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
IREP ENERGY & ASSET MANAGEMENT SERVICES
27
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Backup Calculation: -
WCM 5: Recover Cooling tower blowdown, RO reject, UF 1&2 backwash, STP & WTP backwash
and treat using new UF & RO system for Cooling tower makeup water
Description
Cooling tower blowdown
Cooling tower blowdown operation time
RO reject
RO reject operation time
UF1 & 2 backwash
UF1 & 2 backwash operation time
STP backwash
STP backwash operation time
WTP backwash
WTP backwash operation time
Cooling tower blowdown
RO reject
UF1 & 2 backwash
STP backwash
WTP backwash
Total recovery water
Recovery 65-70%
Annual operating hours
Annual Domestic water savings
Domestic water cost
Annual water cost savings
One-time cost of implementation
Payback period
Unit
m3/hr
hr/day
m3/hr
hr/day
m3/hr
hr/day
m3/hr
hr/day
m3/hr
hr/day
m3/day
m3/day
m3/day
m3/day
m3/day
m3/day
m3/day
days
m3/year
Rs/kL
Rs/year
Rs.
Years
Formula
A
B
C
D
E
F
G
H
I
J
K=A*B
L=C*D
M=E*F
N=G*H
O=I*J
P=SUM(K:O)
Q=P*65%
R
S=Q*R
T
U=S*T
V
W=V/U
Value
0.957
11.8
3.0
1.0
29.0
0.8
51.6
0.8
9.4
1.0
11.3
3.0
23.2
41.3
9.4
88
57
300
17,194
86.6
14,88,971
55,00,000
3.7
Vendor details
1.
IREP India Pvt Ltd
2nd Floor, No 703, Raj towers, ANNA SALAI, mount road, Thousand lights Chennai
Tamil Nadu 600006
Sureshkumar.dk@irepartners.com
IREP ENERGY & ASSET MANAGEMENT SERVICES
28
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
16. Standards
IREP ENERGY & ASSET MANAGEMENT SERVICES
29
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
17. Annexure
Summary of Areas Covered in Water Audit at XXXXX One
Water Management and Reporting System
Policy and Strategy
YES

Practised at site
Water Management responsibility
YES
Practised at site
Use of meters
No


Data collection and analysis
YES

Publicising Water Performance
YES

Reviewed by client
No

Presently not followed
Use of the Standards for Managing Water

Connected to BMS
Reviewed by client
Water Performance (Utility and Process)
HVAC systems and plant
YES
Domestic consumption
YES

Flushing
YES

RO plant
YES

Included in the report
Included in the report


Included in the report

Included in the report
Water Treatment plant
YES

Sewage Treatment plant
YES

Gardening
Included in the report

YES

Opportunities for Reduce
YES

Opportunities for Reuse
YES

Opportunities for Recovery
YES

Included in the report

Included in the report
Water Conservation
IREP ENERGY & ASSET MANAGEMENT SERVICES
Considered, and estimated the
savings
Considered, and estimated the
savings
Considered, and estimated the
savings
30
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
18. Proposed flow meter areas
- Proposed flow meter in lines
- Existing flow meter in lines
IREP ENERGY & ASSET MANAGEMENT SERVICES
31
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
19. Standard Operating Procedure
It was observed during water audit, there was no standard operating procedure no operation of all
the filters, Pressurized Sand Filter (PSF), Activated Carbon Filter (ACF) and Softener is displayed.
Typical Valve numbering for Softener identical to PSF and ACF
SOP for WTP and STP
Pressure Sand Filter (PSF)
1. Backwash: Whenever the pressure crosses more than 0.8 kg/cm2 or once in a day. Close the
normal service valve no V1 & V2, open valve no V3 & V4 for 15 minutes. Switch on raw
water pump.
2. Rinse: close Valve no V3 & V4, switch on the filter feed pump, open valve no V1 & V5, for 10
minutes
3. Service: close valve no V5 & Open valve no V1 & V2 maintain the flow rate of 15 m3/hr.
Note the maximum and minimum working pressure of sand filter is 3.5 kg/cm2 and 2.0 kg/cm2
respectively.
Activated Carbon Filter (ACF)
1. Backwash: Whenever the pressure crosses more than 0.8 kg/cm2 or once in a day. Close the
normal service valve no V1 & V2, open valve no V3 & V4 for 15 minutes. Switch on raw
water pump.
2. Rinse: close Valve no V3 & V4, switch on the filter feed pump, open valve no V1 & V5, for 10
minutes
3. Service: close valve no V5 & Open valve no V1 & V2 maintain the flow rate of 15 m3/hr.
IREP ENERGY & ASSET MANAGEMENT SERVICES
32
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Maintenance – Sand Filter/Carbon filter
1. Extended Back wash: Once a week, the duration of back wash may be increased to 45
minutes. This will help minimize the accumulation of the suspended matter on the filter bed.
2. Inside painting/ Rubber Lining: The inside painting/rubber lining should be checked at lease
once a year and if metal is exposed at any place, corrective action of repainting/re-lining
should be carried out
3. Filter media(sand): One a year open the top cover and observe the filter bed. If any mud
balling or lump formation is noticed, air may be admitted into bed through a 25mm steel or
GI pipe attached to a hose connected to an air blower or air compressor giving oil free air.
Carefully insert steel pipe into the filter bed from top and admit air into the bed to churn the
bed water level above the bed should be about 200 mm. The process of inserting the pipe
admitting air cross section. After the entire bed has been churned, an extended backwash
shall carry out to clean the bed.
4. Filter Media: Inspect the filter media once a year. Open the top cover and observe the
carbon bed. Remove the fine dust by back wash and physically scraping of the top layer. A
sample may be drawn from about 300mm from and for laboratory analysis. Check the bed
depth and make up any shortfall with fresh carbon.
If the media is giving unsatisfactory performance and the laboratory analysis confirms the
same, replace the entire media.
IREP ENERGY & ASSET MANAGEMENT SERVICES
33
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
20. Awareness and Training on Water Savings
The adoption of the above approach ultimately enables ‘Zero Discharge’. This simply
implies reducing freshwater usage and increasing treated waste water use in the
urban sectors. Below figure identified measures for improving water use efficiency in
buildings
IREP ENERGY & ASSET MANAGEMENT SERVICES
34
Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Training and capacity building programs help in not only creating awareness amongst
the employees on water conservation measures but also help in promoting the
culture of water saving amonst them. Tools such as competitions, suggestion
schemes, leaflets, posters, stickets and Department/group meetings are options to
increase awareness on key aspects.
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Water conservation posters
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
Water saving awareness poster
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Water Audit Report
XXXXX One-Chennai, India
Feb-2023
International Real Estate Partners (India) Pvt Ltd
Bangalore, India
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