Car Wash Effluent Treatment

Oil & Grease Trap

Oil & Grease Trap

Car wash effluent consists of many pollutants like Free Oil & Grease (FOG), Surfactants & Chemical Oxygen Demand (COD). There can be some particulate matter also as a result of floor washing water getting mixed with care wash effluent.

A treatment for this effluent is at best tricky & treatment scheme needs to be decided carefully. The treatment depends upon the treatment goals which can be described as below:

  1. Effluent discharge to Sewer
  2. Effluent recycle for Car wash
  • The treatment scheme in first case would entail FOG removal, COD reduction to achieve values well below the statutory limits and TSS removal for polishing. The scheme can be a Oil & Grease trap before the Effluent Storage Tank (Equalisation Tank) – DAF – AOP- PSF – ACF.
  • For recycling of water, Ultrafiltration unit would be needed to remove all the suspended matter instead of Filters.

 

A schematic for Oil & Grease trap is shown below.

 

Dissolved Air Floatation (DAF)

Dissolved Air Floatation (DAF)

 

A simple schematic showing DAF process:

Advanced Oxidation Process (AOP)

Advanced Oxidation Process (AOP)

 

Carwashpic-4Ultra Filtration Unit:

Ultra Filtration is membrane based low Pressure Filtration system to remove the residual COD, Bacteria & Virus to make the water suitable for reuse.

AES has in house technical expertise to treat the Car Wash Effluent economically as well as recycle it to your process.

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