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