1 / 20

Local Limit Essentials for the IPP Professional

Local Limit Essentials for the IPP Professional. Michigan Water Environment Association IPP Spring Training May 28, 2008. Jerald O. Thaler, P.E. Fishbeck, Thompson, Carr & Huber, Inc. Agenda. Overview Pollutants of Concern Maximum Allowable Headworks Loadings

barnard
Download Presentation

Local Limit Essentials for the IPP Professional

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Local Limit Essentialsfor the IPP Professional Michigan Water Environment Association IPP Spring Training May 28, 2008 Jerald O. Thaler, P.E. Fishbeck, Thompson, Carr & Huber, Inc.

  2. Agenda Overview • Pollutants of Concern • Maximum Allowable Headworks Loadings • Maximum Allowable Industrial Loadings • Local Limit Allocation • Example Application

  3. Local Limit Overview • Applicable to POTWs with IPP Requirement • Developed by individual communities • Site-specific • Technically based • Enforce general and specific prohibitions • Approved by the MDEQ • Generally good for 5 years

  4. General Prohibitions • Pollutants that: • Causepass-through • Direct violation of NPDES permit requirement • Cause interference • Indirect violation of NPDES permit requirement due to disruption of the WWTP

  5. Specific Prohibitions • Pollutants that: • Create fire/explosion hazard • Cause corrosive structural damage • Cause flow obstructions • Pollutants with: • Excessive release rates causing interference • Excessive heat inhibiting biological activity • Oils causing pass-through or interference • Toxic gases, vapors, or fumes • Trucked or hauled wastes, except as designated

  6. POCs • Reasonably expected to be discharged in amounts causing: • Pass-through or interference • Collection system problems • Plant operational problems • Worker health and safety problems • Control mechanism present in NPDES permit

  7. Compatible POCs • Recommended • 5-day Biochemical Oxygen Demand • Total Suspended Solids • Phosphorus, Total • Ammonia Nitrogen • Fats, Oil, and Grease

  8. Toxic POCs • Required • Recommended

  9. MAHLs • Critical influent mass for selected criteria • For compatibles: • Basis of design • Pass-through • For toxics • Pass-through: • Sludge quality • Inhibition

  10. MAHL Criteria: Pass-Through • Use overall removal and limiting discharge concentration:

  11. MAHL Criteria: Sludge Quality • Use current influent concentration, current sludge quality, and limiting sludge quality

  12. MAHL Criteria: Inhibition • For secondary treatment, use primary removal and inhibiting concentration:

  13. MAILs • Mass available for allocation to SIUs • MAHL - safety factor - background load

  14. Uniform Allocation Method • Simplest and most conservative • Distribute MAIL equally to all SIUs • One set of local limits

  15. Industrial Contribution Method • More complicated, but can help local economy • Distribute SIUs as Nonspecific (domestic strength) or Specific (above domestic strength) • Two sets of local limits

  16. Perspective • MAHL = plant’s capacity to treat a POC • Local limits can significantly impact local economy • View MAHL like a pie • Many ways to slice it • Cannot give away more than you have

  17. Perspective (continued) • Complications arise in real-world applications • Collection system limitations for volatile organics • Local limits for pH • Categorical standards for certain SIUs • Hidden background loadings (e.g., silver from photo finishers) • Nondetectable monitoring data • Negative local limit calculation results • Expert help is available… at reasonable cost

  18. Example Application (handout)

  19. QuestionsandDiscussion jothaler@ftch.com248-324-2090

  20. List of Acronyms Industrial Pretreatment Program Maximum Allowable Headworks Loading Maximum Allowable Industrial Loading Michigan Department of Environmental Quality National Pollutant Discharge Elimination System Pollutant of Concern Publicly-Owned Treatment Works Significant Industrial User Wastewater Treatment Plant IPP MAHL MAIL MDEQ NPDES POC POTW SIU WWTP

More Related