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Industrial Pretreatment and Meeting NPDES Requirements for Improved Water Quality

Industrial Pretreatment and Meeting NPDES Requirements for Improved Water Quality. City of Walla Walla, WA and OMI a public-private partnership By Bill Slovensky. Preview. Consider regulations Determine a method to achieve our goals Communicate with all people that need to know

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Industrial Pretreatment and Meeting NPDES Requirements for Improved Water Quality

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  1. Industrial Pretreatment and Meeting NPDES Requirements for Improved Water Quality City of Walla Walla, WA and OMI a public-private partnership By Bill Slovensky

  2. Preview • Consider regulations • Determine a method to achieve our goals • Communicate with all people that need to know • Review changes made to methodologies • Review results

  3. Federal Requirements POTWS that must have Industrial Pretreatment Programs (IPP) • Over 5.0 MGD (max. design flow) and Receiving Industrial Wastewater, or • Under 5.0 MGD and Receiving pollutants that pass through or interfere with POTW, or • The Approval Authority or EPA finds a local program is needed to protect the POTW.

  4. City of Walla Walla has three industries that are required to be permitted under the current program: • Washington State Penitentiary (WSP) • Juice bottler • Chrome plater

  5. Local Limits • As has been common historically, the City adopted limits from another city in a similar locale • With our strict permit limits, it was clear that technically based local limit (TBLL) development was required

  6. TBLL • The State of Washington has a great tool for developing local limits • Using the spreadsheet, limits were developed for most metals • Additional calculations were required for two permitted metals (Copper and Zinc)

  7. NPDES limitsin WW • Copper - 6.34 ug/L (ppb) • Zinc - 54.94 ug/L

  8. NPDES limitsin WW • Copper - 6.34 ug/L (ppb) • Zinc - 54.94 ug/L These limits yield local limits of 65 ppb Copper and 190 ppb Zinc

  9. WSP Requirements Allocation of a portion of these limits to WSP was necessary because they make up about 10% of plant flow during peak times

  10. WSP Requirements Allocation of a portion of these limits to WSP was necessary because they make up about 10% of plant flow during peak times Specific limits for WSP were set at 30 ppb Cu and 100 ppb Zn

  11. Communication A critical aspect attributing to the success of the program was clear communication with regulators and local industries. Because the practice was inclusive (as was practical), everyone knew their requirements and all expectations were clear

  12. WSP steps up to the plate! WSP recognized that there was a lot of work to be done in order for them to meet proposed limits Hired a full time environmental person on site

  13. WSP steps up to the plate! • Eliminate water screen in powder coating booth and substitute product • Eliminate floor washing in production areas (sweep instead) • Limit use of steam jets (not continuous, only when necessary) • Change floor cleaning/stripper product to one not containing zinc • Mercury filtration on dental facilities

  14. WSP steps up to the plate! • Eliminate stormwater discharge to sanitary sewer (cross connections) • Install an auger monster to help remove solids • Establish a composting facility • Improve hospital and dental facilities (zero discharge from xray units) • Plugged floor drains in manufacturing areas • Created a disposal path for unused pharmaceuticals

  15. BMPs implemented at WSP

  16. Geometric Mean Cu=33 Zn=104 Cu=73 Zn=199

  17. Win-Win • The reduction in Cu and Zn discharges calculated to 55% and 48%, respectively • The WSP gained by upgrading their systems into the 21st century, which helped avoid surcharges and potential fines • The City of Walla Walla gained a cleaner influent making it more likely to achieve compliance with permit limits

  18. Cu=5.9 Zn=49 Geometric Mean Cu=4.5 Zn=41.9

  19. Cleaner Water • The best management practices implemented at the largest SIU improved the WWTP effluent significantly • The Cu and Zn discharges from the WWTP were reduced by 24% and 14%, respectively

  20. In Conclusion • Consider regulations Followed state and federal regulations • Determine a method to achieve our goals Calculate and implement appropriate local limits • Communicate with all people that need to know Evaluated new limits with state regulators and informed the SIUs of upcoming limits • Review changes made to methodologies Implemented BMPs • Review results Graphic display illustrates improved water quality

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