Car wash and vehicle service station wastewater contains petroleum hydrocarbons, engine oil, grease, detergents, and sediments — all prohibited under NEQS from direct discharge. The typical treatment approach combines an API oil-water separator with SAF/DAF for hydrocarbon and SS removal, followed by multimedia filtration. Water recovery ratios of 60–80% significantly reduce water consumption for commercial car wash operations.
API separator removes free floating oil. SAF/DAF with coagulant removes emulsified hydrocarbons and SS. Multimedia filter polishes to reuse standard. 60–80% water recovery achievable.
Dissolved air flotation — flat configuration.
TSS, FOG and SS removal.
Cavitation air flotation — oil & grease removal.
Membrane filtration — effluent suitable for reuse.
Precision chemical dosing.
On-site ClO₂ disinfection.
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