Transcript Oil & Grease and Your Sewer Use Ordinance

Elaine J. Venema, PE.
Fleis & VandenBrink Engineering, Inc.
Jerald O. Thaler, P.E.
Fishbeck, Thompson, Carr & Huber, Inc.
Potential Industrial Discharge Effects
www.michigan.gov/deq
General Prohibition
Federal Pretreatment Regulations 40 CFR 403 and
Michigan Part 23--Pretreatment Rules require that:
 Any nondomestic user introducing pollutants into a
POTW may not cause pass-through or interference
www.michigan.gov/dgallery
Pass-through
Discharge from a POTW that violates any NPDES
permit requirement, including:
 Increase in magnitude of the violation
 Increase in duration of the violation
Interference
A user’s discharge that, alone or in combination with
other user discharge(s), causes both of the following:
 Disruption of the POTW’s operation, wastewater treatment,
and/or sludge processing
 Pass-through or restriction of sludge disposal
Compatible Pollutants of Concern (POC)
Pollutants which a POTW is typically designed to treat,
and typically subject to extra-strength surcharges:
 5-day Biochemical Oxygen Demand (BOD5)
 Total Suspended Solids (TSS)
 Total Phosphorus (Total-P)
 Ammonia Nitrogen (Ammonia-N)
What about Fats, Oil & Grease?
While generally considered a compatible POC,
represents a special case:
 Collection system “cholesterol”
 One of the major causes of sewer blockage
 Requires control at the source
 Often excluded from extra-strength surcharge program
C. Bellmore/City of Mount Clemens, MI
Common Nondomestic Dischargers
of Compatible POC
 Hospital
 Commercial Laundry
 Hauled Wastes (e.g.,
septage)
 Food Processing
 Dairy
 Brewery/Winery
 Rendering
 Landfill Leachate
Agenda
 Control Options
1 – Treatment at the Source
2 – Treatment at POTW with Insufficient Capacity
3 – Treatment at POTW with Excess Capacity
 Questions and Discussion