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Effective Oil/Water Separation Solutions for Cost Savings and Compliance

Learn how Oil/Water Separators (OWS) can help reduce disposal costs, permit requirements, and service intervals. Find out about alternative Best Management Practices (BMPs) to minimize solids and contaminants. Discover inspection, bioremediation, and wastewater reduction strategies, along with case studies demonstrating significant cost savings through innovative OWS approaches.

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Effective Oil/Water Separation Solutions for Cost Savings and Compliance

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  1. Unit 9Oil/Water Separators

  2. What is an OWS?

  3. Making It Work • Reduce your disposal costs • Reducing your permit and regulatory requirements • Reducing your service intervals

  4. P2 Alternative: OWS BMPs MINIMIZE • Solids: sediments, trash, sand • Contaminants: antifreeze, fuel, solvents, paint • Wastewater, storm water, wash water INSPECT Bioremediate

  5. Minimize Solids: Grates and Screens

  6. Minimize Contaminants • Eliminate or minimize floor drains • Use “dry” cleanup techniques • Be aware of potential contaminant sources - antifreeze - paints - oils - solvents - fuels • Heavy vs. light contaminants • Avoid emulsifying detergents

  7. Minimize Wastewater • Mitigate introduction of storm water with berms and washrack covers. • Reroute roof drains and condensate from air conditioning and air compressors • Use high-pressure, low-volume sprays for vehicle washing

  8. Inspection and Clean Out • Implement regular inspection • Sludge depth – Contaminants (odors, sheens) • Floating oil – Solids on grates • Perform regular cleanout • Determine need for cleanout based on inspection, not calendar • Remove oil from collection trough or from surface using reusable absorbent pads • Refill OWS with water before returning to service

  9. Making Bioremediation Work • Periodic “microbe dosing” of OWS replenishes microbe population • Keep pH level < 8.5 • Harsh chemicals can kill microbes • Vendors can provide equipment, microbes, and labor as part of service agreement ($75 to $130 per month)

  10. Case Study 1: Salem Boys Challenge: Reduce $1,000 cost of OWS cleanout incurred every 3 months Approach: • Install screens and 1/4” expanded steel mesh to existing OWS grates • Use pigs and sloping pavement to settle out sediment • Use “oil-only” absorbent pads to collect floating oil from OWS water surface

  11. Case Study 1: Salem Boys • Dose OWS with microbes every 4 hours (service costs $75 per month) • Use removable screens in vehicle bay to remove debris

  12. Case Study 1: Salem Boys Results: • reduced cleanout frequency by 75% - from once every 3 months to once/year • saved approximately $3,000/year in sludge cleanout and disposal • microbe dosing costs $900/year • debris grates and absorbents cost $250/year

  13. Case Study 2: USPS Huntington Beach, CA • Discharge violations • 80% reduction of effluent hydrocarbons with bioremediation

  14. Take Home Messages • Understand how your OWS works • Source reduction and segregation • Bioremediation works • Save $$ by reducing clean-out frequency and violations

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