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Unit 9 Oil/Water Separators

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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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making it work
Making It Work
  • Reduce your disposal costs
  • Reducing your permit and regulatory requirements
  • Reducing your service intervals
p2 alternative ows bmps
P2 Alternative: OWS BMPs

MINIMIZE

  • Solids: sediments, trash, sand
  • Contaminants: antifreeze, fuel, solvents, paint
  • Wastewater, storm water, wash water

INSPECT

Bioremediate

minimize contaminants
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
minimize wastewater
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
inspection and clean out
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
making bioremediation work
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)
case study 1 salem boys
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
slide11

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
case study 1 salem boys1
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
case study 2 usps
Case Study 2: USPS

Huntington Beach, CA

  • Discharge violations
  • 80% reduction of effluent hydrocarbons with bioremediation
take home messages
Take Home Messages
  • Understand how your OWS works
  • Source reduction and segregation
  • Bioremediation works
  • Save $$ by reducing clean-out frequency and violations