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:
- Effluent discharge to Sewer
- 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.
A simple schematic showing DAF process:
Ultra 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.