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Controlling POTW Pass-Through/Interference Due to Compatible Pollutants

Controlling POTW Pass-Through/Interference Due to Compatible Pollutants. Jerald O. Thaler, P.E. Fishbeck, Thompson, Carr & Huber, Inc. Elaine J. Venema, PE. Fleis & VandenBrink Engineering, Inc. Potential Industrial Discharge Effects. www.michigan.gov/deq. General Prohibition.

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Controlling POTW Pass-Through/Interference Due to Compatible Pollutants

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  1. Controlling POTWPass-Through/InterferenceDue to Compatible Pollutants Jerald O. Thaler, P.E. Fishbeck, Thompson, Carr & Huber, Inc. Elaine J. Venema, PE.Fleis & VandenBrink Engineering, Inc.

  2. Potential Industrial Discharge Effects • www.michigan.gov/deq

  3. 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

  4. 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

  5. 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)

  6. 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

  7. Common Nondomestic Dischargers of Compatible POC • Hospital • Commercial Laundry • Hauled Wastes (e.g., septage) • Food Processing • Dairy • Brewery/Winery • Rendering • Landfill Leachate

  8. 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

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