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Unit 9 Oil/Water Separators

Unit 9 Oil/Water Separators. What is an OWS?. Making It Work. Reduce your disposal costs Reducing your permit and regulatory requirements Reducing your service intervals. P2 Alternative: OWS BMPs. MINIMIZE Solids: sediments, trash, sand Contaminants: antifreeze, fuel, solvents, paint

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Unit 9 Oil/Water Separators

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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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