Northern Michigan Wastewater Operators Seminar 2008 Onaway Wetlands Treatment
City of Onaway WWTP John Palmer, City of Onaway WWTP Operator Randy Scott, Project Manager, Wilcox Professional Services, LLC
Location
Demographics • Area: 1.5 Square Miles • Population: 993 • Families in Poverty: 20.3% • Household Median Income: $20,787 • Taxable Value: $12 million • Low/Mod Population: 59.6% • Annual Budget: $400,000 – $130,000 Water – $280,000 Wastewater
Original Project DesignTeam Wilcox Professional Services, LLC McNamee Porter & Seeley Tetra Tech Dr. Robert Kadlec
Early Activities 1998 • Referendum (February 24 th ) • Application for NPDES Permit (March 12 th ) • Environmental Review (April 28 th ) • Wetlands Evaluation (July 18 th )
1998 Preliminary Engineering Report • Customer Base: 517 > 572 • EDU Count: 688 > 775 • Flow (g/d): 144,440 > 162,750 • Design Flows 200,000 g/d or 0.2 mgd
Preliminary Engineering Report Treatment 1998 • Sequencing Batch Reactor (SBR) • Aerated Lagoon – Spray Irrigation • Aerated Lagoon – Wetlands Discharge
Preliminary Engineering Report 1998 Treatment - Discharge Locations
Preliminary Engineering Report Lagoon Spray Irrigation 1998 • City had the land • Ability of the land to adsorb • Need 6 months storage • Carry over aerosols & odors • Easily clogged • MDEQ favored wetlands • O & M difficult • Neighbors concerns
Preliminary Engineering Report 1998 Treatment – Lagoon Wetlands • City had the land • Long term capacity not required • Wetlands polish the treatment • Must monitor and maintain wetland • Cost: $3,240,000; Annual: $137,886
Phase I: Treatment 1998
Phase I: Treatment 1998
Phase I: Treatment 1998
Preliminary Engineering Report 1998 Discharge Location • Concerns about report outcome • Investigate some other discharge possibilities
Permits 1999 • Wetlands – Public Hearings (January) – Granted (June) – Special monitoring • NPDES – Comments on draft permit (July 12 th ) – Public Hearings (Fall)
Permit Challenge 1999 • Concern about potential flooding – Beaver Dam destruction • Potential of contamination
Permits 2000 • NPDES – Permission to discharge (February) – Ambient monitoring plan (October)
Permits Challenge 2001 • Administrative Hearing (March 8 th ) – A/G defends • Results Favorable for City • Sued in Ingham County Court – City hires Steve Winters
Permits Challenge 2001 • Case heard before the court (August) – There is no stream, not waters of the State – Court rules in City’s favor • Plaintiffs prepare to sue in Presque Isle County – Issue settled • City Expends $ 50,000
Permits 2003 • MDEQ Construction Permit acquired (January 9 th ) • CMI Construction permitted (February)
Phase I: Treatment 2003
Phase I: Lagoons 2003
Phase I: Lagoons 2003
Phase I: Lagoons 2003
Phase I: Lagoons 2003
Phase I: Lagoons 2003
Phase I: Filtration Beds 2003
Phase I: Filtration Beds 2003
Phase I: Filtration Beds 2003
Phase I: Treatment Building 2003
Phase I: Wetlands 2003
Phase I: Lagoons 2004
Phase I: Lagoons 2004
Phase I: Filtration Beds 2004
Phase I: Treatment Building 2004
Phase I: Treatment Building 2004
Phase I: Wetlands 2004
Phase I: Wetlands 2004
Phase I: Treatment Building 2004
Summary 2004 • Total Project: $13,283,350 – USDA RD • Grant: $ 7,192,000 • Loan $ 2,503,000 – EDA: $1,290,000 – CMI: $1,000,000 – MEDC: $582,350 – SFR/USDA RD Hardship: $566,000
Has anyone seen this animal
Inside our Building
Chemical Feed • Ferric Chloride for total phosphorus removal • NPDES permit limits 2 City of Onaway Wastewater Treatment Plant Chemical Treatment System Ferric Chloride ( FeCl 3 ) – 1.0 mg/L monthly Day Tank 21 inch diameter 30 inches high Storage Tank Π r 2 x L= (3.14) (.875) 2 x 2.5= 77 inches in height 6.010 FT 3 x 7.48= 46 gallons 64 inches diameter 46 gallons/30 inches= 1.5 gal/in Π r 2 x L= (3.14) (.2.6) 2 x 6.4= 138 FT 3 x 7.48= 1038 gallons 1038 gallons/77 inches= To Influent 13.5 gallons/ inch Storage Wetwell then Tank to Cell # 1 Day Tank
Other NPDES Permit Limitations • Design flow = 0.200 MGD • Dissolved Oxygen – 4.0 ppm daily minimum • CBOD5 – 85% removal Ph - Range between 6.5 s.u. to • 9.0 s.u. – 25 mg/L-30 day average • Suspended solids • Annual Wetlands and Ambient Evaluation – 85% – 30 mg/L -30 day average • Fecal Coliform – 200 # /100 ml -30 day average
Wetland Discharge
Wetlands 1, 2, 3
Lagoons with Aerators (6 total)
Operator Add On • Evaporation Bed - Dumping Station for lift station cleaning using City’s Vac Truck • Barley Grass to control algae blooms
Plant Performance Actual Actual Percent Percent Removal Suspende Removal BOD5 Based on d Solids Based on Removal Concentrat Removal Concentrat 2008 INF BOD5 EFF BOD5 ion 2008 INF SS EFF SS ion Jan 288 2.5 99 Jan 240 2.9 98.7 Feb 221 2 99 Feb 223 5 97.7 March 212 2.6 98.7 March 205 4 98 April 168 4 97.6 April 206 7 96.6 May 165 18.3 89.8 May 180 2.8 98 June 278 2 99 June 303 9 97
Cold Weather Operation in Onaway • Lagoon #1 surface frozen over. • Reduced sunlight reduces the biological phosphorus removal process, ferric chloride use is necessary.
Winter Operation with Filter Beds
Infiltration Beds
Duck, Duck, Goose
Any Questions? Thank You
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