unit 9 oil/water separators. what is an ows? making it work reduce your disposal costs reducing your...
TRANSCRIPT
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Unit 9Oil/Water Separators
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What is an OWS?
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Making It Work
• Reduce your disposal costs
• Reducing your permit and regulatory requirements
• Reducing your service intervals
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P2 Alternative: OWS BMPs
MINIMIZE
• Solids: sediments, trash, sand
• Contaminants: antifreeze, fuel, solvents, paint
• Wastewater, storm water, wash water
INSPECT
Bioremediate
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Minimize Solids: Grates and Screens
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• 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 Contaminants
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• 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
Minimize Wastewater
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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
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• 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)
Making Bioremediation Work
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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
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• 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 Boys
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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
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Case Study 2: USPS
Huntington Beach, CA
• Discharge violations
• 80% reduction of effluent hydrocarbons with bioremediation
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Take Home Messages
• Understand how your OWS works
• Source reduction and segregation
• Bioremediation works
• Save $$ by reducing clean-out frequency and violations