Waste water treatment - conforming
to EU Waste Water Directive
study case of Tg. Mures
Otto DARABAN
General Director
SC Compania Aquaserv SA
Who we are?
Status: regional operation company shareholders 6 Local Councils and Mures
County Council Consiliul Judetea Mures
Turnower:38 mil RON (1 Euro=3.7 RON)
Employees:820
Operation locations: 6 city and 14 locations in rural areea
Infrastructure:
•water treatment plants 7
•waste water treatment plants 6
•water network 936km
•sewers 620km
Servicies:
•drinking water treatment&distribution 15 mil mc/y
•waste water collection&treatment 14,1 mil mc/y
Clients:
•hoseholds 230,486
•industrial&institutions 15,107
History
1909 - 1911
•
34 km combined sewer
•
preliminary treatment plant
•
pumping station
1967 -1979
•
primary treatment
•
two digesters 2x1500 mc
•
sludge drying beds 0.25 ha
•
sludge lagoon 40000 mc
1980 -1989
•
secondary treatment (900 l/s)
•
digesters 2x4000 mc
•
gr. thickeners 2x1568 mc
•
biogas holders 2x1000 mc
•
sludge pumping stations
•
sludge drying beds 1.85 ha
New institutional framework
No finances from
the Government
Low service
tariffs
Low treatment
efficiency
High ware of
the equipment
Waste water
treatment
High energy tariffs
High electrical
consumption
More stringent
effluent standards
MUDP I Project-trying to survive
Objective:
• Investments in infrastructure
• Realization of the operator’s financial independence
• Management improving
Budget: Total 6.6 Mil $ (3.2 Mil $ for WWTP)
• 50% EBRD loan
• 45% Romanian Government
• 5% Local Council Tirgu Mures
Period:
1995-2001
MUDP I Project-scope of the works
Extension of the secondary
treatment’s capacity
• Finally clarifier
• Activated sludge pumping
station
Improving sludge treatment
• Digester’s rehabilitation
• Sludge thickening
• Sludge dewatering
Project CHP-new resources
Objective:
Reduce CO2 emission
Budget: total 1.1 Mil $ (for
WWTP)
• 1 Mil $ Dutch Government’s
grant
• 0.1 Mil $ company’s
contribution
Period:
1998-2000
CHP plant
• fuel: biogas/CH4
• capacity: 450 kWe+730 kWth
ISPA Project-EU support
Objective of the project: to
rehabilitate the existing
infrastructure
Results of the project:
• waste water treatment for a
perspective year 2020,
including surrounding villages
• comply with 271/91/EEC
• reducing risk regarding public
health
• decreasing pollution
downstream Mures River
Budget:
• Total 28 Mil Eu (21 UE
grant, 7 EBRD loan)
• Comp B WWTP - 8.5 Mil Eu
Contractor:
Allewijse & Spaans Babcock
(The Netherlands)
Finish: Dec 2007
ISPA Project-scope of the works(1)
Preliminary treatment: new
structure
• screens (coarse & fine)
• compactor for screenings
• combined sand/grease
separator
• sand washing unit
Storm management
• refurbishment of the existing
balancing tank (sugar factory)
• storm water return pumping
station
Primary treatment:
• repair of primary clarifiers
• replacing the PC bridges
• automated sludge withdrawal
system
• refurbishment of sludge
pumping station
• refurbishment of decanted
water pumping station
ISPA Project-scope of the works(2)
Secondary treatment:
• refurbishment of the
biological reactor
• refurbishment of activated
sludge pumping station
• automated sludge withdrawal
system
• refurbishment of sludge
pumping station
• refurbishment of decanted
water pumping station
Power supply
• island operation for CHP
• refurbishment of transformer
house
• replacing main power cables
Process control
• complete automation
• new SCADA system
• automated sampling system
Where we are now?
•
Treatment capacity 1200 l/s
•
Sludge cake (18-20% DS)
22,000 mc/y
Biogas produced
1,400,000 mc/y
Energy recovered
~3,300 MWh/y electrical
~5,100 MWh/y thermal
•
•
Performance of the plant
91/271/EEC Limits
Parameter
BOD-5
COD-Cr
TSS
N tot
P tot
Conc.
(mg/l)
25
125
35
10
1
Efficiency
(%)
70-90
min. 75
min. 90
70-80
min. 80
Non conform
samples
18
18
18
0
0
Aquaserv resoults in 2007
Conc.
(mg/l)
22.5
42.4
28.6
18.6
2.9
Efficiency
(%)
81
78
92
22.6
15.8
Non conform
samples
22
11
7
140
17
What is left?
Implement Directive 91/271/EEC in the operation region of
Compania Aquaserv according to the EU negotiation documents and
improuving the sludge management&disposal
•Master Plan for Mures county (2037) identyfies 1,320 mil Euro,
from which:
•drinking water 650 mil Euro
•waste water 670 mil Euro
•first priority investments prepared for EU cohesion founds 89
mil Euro, from which :
•collection systems 27 mil Euro (20 ext. + 7 reab.)
•WWTP 18 mil Euro (10 newTP + 8 reab.)
•DWT facilities 31 mil Euro (15 new TP + 16 reab.)
•water distrib. systems 13 mil Euro (8 ext. + 5 reab.)
Conclusions
WATER means LIFE!
WASTE WATER TREATMENT means CIVILISATION !
High efforts were made by community of TG. Mures
Operator company’s contribution
• identifying&implementing projects
• properly operation of the infrastructure
Thank you!