75,000 gallons per day capacity Small Plant operations
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Crockery Township Clean Water Plant Ultra-Filtration Membrane Treatment 75,000 gallons per day capacity Small Plant operations (If wishes were horses…) Joe Hebert – Supervisor, Ottawa County Dept. Public Utilities
Transcript of 75,000 gallons per day capacity Small Plant operations
Crockery Township Clean Water Plant
Ultra-Filtration Membrane Treatment 75,000 gallons per day capacity
Small Plant operations
(If wishes were horses…)
Joe Hebert – Supervisor, Ottawa County Dept. Public Utilities
OTTAWA
Crockery Twp. Clean Water Plant Flow Schematic
Outfall
Alum NaOH
Force Main
2mm Fine Screen
Bio-Reactor Bio-Reactor
RAS
Membrane
Filters
Sludge Storage
UV Disinfection
Cascade
Aeration
Solids Disposal
Sludge Disposal
MLSS
Still only 30% of design flow (fewer customers and $$$)
-aging membranes (beyond 10 yrs)
Reducing permeability
-need to maintain performance
Cut costs where possible
-electricity, labor, laboratory, sludge
No “turn down” capability built in
-develop new operations procedures
No air optimization capabilities
-find ways to use air more efficiently
Operations challenges
NPDES Permit Limits
Daily Monthly Ave.
• CBOD5 10 mg/l 4 mg/l
• NH3 2 mg/l 0.5 mg/l
• T Phos -- 0.15 mg/l
• TSS -- 20 mg/l
• F/C -- 200 cts
Construction in 2005
Initial Costs
In Millions USD
$0.653
$0.451
$0.053
$0.069
$0.183
$0.167
Building
Process Equipment
Admin.
Engineering
Site Work
Land
Total
$1.575 M
Influent Flow
• 22,000 gpd as of Mar 2017 (30% cap.)
• CBOD5 290 mg/l
• NH3 42 mg/l
• Phos 7-9 mg/l
• TSS 270 mg/l
Influent Screening
• 2 - Ortec 2mm drum screens with rotating brushes
• .37 MGD capacity each
2 Aeration Basins
• 37,000 gallons each
• Fine bubble (EDI – 2014,2016)
• Startup in January 2006
• Biomass seeded in March 2006
Aeration Blowers
• 3 Bio-Reactor Blowers
• 204 cfm each
• 2 membrane air scour blowers
• 220 cfm each
• 2 – Aquafine units
• Dual unit redundancy
• 0.18 MGD capacity per unit
• 12 Hg low pressure lamps each
Ultraviolet Disinfection
GE/Zenon Modular Membrane Units
• 2 Independent Trains
ZW-500b modules
• Each cassette contains 8 modules
• 5,200 sq.ft. filter area per cassette
• 0.04 micron nominal pore size
0.04
• Every 12 months / 3 days per cassette
• Inspection
• Hose out sludge and debris
• 300 mg/l Cl2 for 12 hours
• 2,000 mg/l Citric Acid for 24 hours with pH adjustment to 2.2
Membrane Recovery Cleaning
Permeability Problem (RC only)
Permeability Problem (RC and CIP)
horses, turnips, if’s, and’s
• Stay ahead of permeability issues
• Need better membrane condition tracking
• Use more aggressive cleaning strategies
• Push membrane life (another 10 years?)
Joe Hebert, Supervisor
Ottawa County Road Commission, Department of Public Utilities
Email: [email protected]
Office: 616-850-7219 Cell: 616-638-0382
