METAWATER Ceramic Membrane
Filtration System
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
What is Ceramic Membrane?
• High permeability
– Low feed pressure, Low energy consumption
• Particle separation
– Narrow pore size distribution
•Chemical resistance
- pH range, cleaning chemical
•Temperature range
- 30 /150 F
•Wider pressure range
- 70psi （Backwash)
Nominal pore size
Dimension
Channel I.D.
Surface area
Number of channel
Flow rate
0.1micron
OD 7.1” x L 60”
1/8”
269ft2
2000
18gpm at 100gfd
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
What is benefit of Ceramic membrane?
• Stable operation
– No membrane breakage
• Lower O&M cost
– Longer membrane life
– Lower energy consumption
• High permeability & high permeability recovery
• Applicable many type of water
–
–
–
–
Surface water
Secondary effluent
Filter backwash
Industrial process water
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How water flows inside membrane?
Filtration cell
Support layer
Membrane Layer
(0.1micron pore size)
Water collection cell
(No membrane layer)
Membrane Surface
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Water flow pattern
Filtration cell (hexagon channel)
Water collection cellCopyright©
(rectangle
channel)
2008 METAWATER
Co., Ltd. All Rights Reserved.
Pore size distribution
META ceramic
membrane
Polymeric
membrane
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
Installation
Ceramic membrane installed in a housing (module)
Ceramic membrane
Membrane rack
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Membrane skid
10 modules x 4 racks(40membrane elements)
METAWATER provides whole skid:
Membrane racks, internal connection, control panel, BW equipment
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Schematic
*Inline dosage
Pretreatment option: Powdered Activated Carbone (PAC),
Coagulant, Ozone, Chlorine, KMnO4 etc.
Operation: Filtration - Backwash – Chemical Enhanced Backwash –
Cleaning in Place
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TMP(psi)
Filtration and Backwash
Filtration
Backwashing
Filtration
Filtration cycle(60-360min)
Compressed air
Filtrate
Backwashing water
Filtrate
Raw water
Backwashing water
Time
Pressurized 70psi
Wastewater
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How membrane is cleaned?
Shooting point
Filtrate
Feed water
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Chemical cleaning (CEB)
CEB cycle (1 per day-week)
TMP(psi)
Backwash
TMP baseline increase
by irreversible fouling
Chemical Enhanced Backwash (CEB)
Time
•Maintenance cleaning purpose
•Chemical soaking
•15-30min followed by BW
•Chemical: pH2 H2SO4
: Hypo 10-100ppm
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
Chemical cleaning (CIP- Full Cleaning)
CIP cycle (1 per month-3months)
TMP(psi)
20psi
CIP
CEB
Cleaning In Place (CIP)
•Full cleaning
•Chemical soaking
•Citric acid (1%) 4-12hours
•Hypo (300-3000ppm) 4-8hours
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
Full scale installation
•More than 120 installations in Japan since 1998
•First installation in US (Parker, CO Start up 2015)
•No membrane breakage, No membrane replacement
•Small to Large scale installation (100gpm to 13MGD)
• First wastewater installation in 2010 (pre-ozonation)
• Awarded 45MGD BTO project, City of Yokohama
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
Example Layout 2 skid (3MGD)
Receiving tank/ Flocculation
Feed pump
Air compressor
Chemical storage
70’
CIP unit
Control panel
91’
Membrane skid
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
Example layout 8 skids (15-20MGD)
Raw water/ Flocculation
Electrical room
Chemical storage
160 ft
BW unit
Membrane Skid
Control room
CIP unit
220 ft
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
Operation History1
DWTP in Kyoto (Start up in 1998)
Capacity:
Raw water:
Flow:
Flux:
BW interval:
CIP interval:
Recovery:
0.2MGD (425 m3/day)
River surface water
Coagulation (PACl) => Membrane filtration
50gfd
6 hrs (No CEB)
One per year
>99%
CIP
2.0
TMP (bar)
1.5
1.0
0.5
0.0
1998
1999
2000
2001
2002
2003
2004
year
2005
2006
2007
2008
2009
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Operation History2
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Wastewater application
– Tertiary treatment
– Ozonation followed by ceramic membrane
– Smaller foot print
– Less coagulant dosage
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
Full scale installation (Shibaura WWTP)
● Capacity : 1.85MGD (7,000 m3/day)
● Biofilter : φ4.5m x 4 tanks = 120 m/day
● Ozonizer : 133ppd
2.5 kg-O3/hr x 2
● Ceramic membrane : 54membrane x 2units
Ozonizer building
Ceramic membrane
building
Operated since
April 2010
Ozone contactor
Biofilter
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Water reclamation full scale operation
Residual O3 ：0.1 ～ 0.5mgO3/L (0.3 mg/L more than 90% of time)
pH control ：6.3 ～ 6.8
PACl dosage：20 ～ 68mgPACl/L
BW cycle: 2hours CEB: soak 10ppm Hypo 1 per 3-7days
TMP
Flux
20
CIP
200
CIP 1 rack per month
160
15
120
10
80
5
40
0
1-Apr-10
Flux (gfd)
Initial TMP （Psid at 25 ℃）
25
0
28-Sep-10 27-Mar-11 23-Sep-11 21-Mar-12 17-Sep-12 16-Mar-13
Stable membrane filtration demonstrated at the
high flux without CIP.
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
Upcoming project: Yokohama 45MGD
• BTO (Build-Transfer-Operation) project Commission
period of operation = 25 years
• Surface water
• Fine Powder Activated Carbon (s-PAC)
• 2,400 ceramic membrane
• Filtration by gravity (no feed pump)
Sludge
Dewatering
Filtration
room
Clear well
Solar panel
Ceramic membrane system
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Yokohama: Plant design
Utilize head pressure to filtration
• No feed pump required
• Save feed pump energy
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Summary
• High quality water
– Mechanical strength
• High integrity -No breakage
– Uniform pore size distribution
• Reliable physical separation
• Water saving
– High feed water recovery >98%
• Energy Saving
– Electric power consumption< 0.1 kWh/m3 (0.38 Wh/gal)
• Low Maintenance
– Long membrane Life >20years
– Easy chemical cleaning
• Design flexibility
– Combination with enhanced treatment (e.g.) coagulation,
pre-ozonation, Powdered Activated Carbon (PAC)
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.
Pilot unit
• Flow rate: 15-30gpm
• Full automatic operation
• Remote monitoring available
Mem
brane
10 ’
3. Mixing
Tank
5’x4’
4.Chem.
Feed
5’x3’
1.Main Unit
12’x5’
Trans
6.Compresso
r
3’x2’
24
’
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Bench scale testing set up
•Ceramic membrane OD 1”x 3” ; 0.44sqf
•Flow rate: 0.03gpm(=0.11Lmin) at 100gfd
Testing space: lab 3’x6’ table
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Small scale unit (4membranes)
10ft
20ft
7ft
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Small scale unit (4membranes)
Membrane
7’
20’
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Certification
• NSF61 certified
• California Department of Public Health
(CDPH)
– Flux 175gfd
– LRV4 crypto, LRV1 Virus
• CDPH Title 22 for wastewater treatment
• Colorado Department of Public Health
and Environment
Copyright© 2008 METAWATER Co., Ltd. All Rights Reserved.