Comparison studies on treatment of automobile wash wastewater by filtration techniques using alum sugarcane bagasse and wood dust.

Fast urbanization has boosted the automotive sector in cities. Two service stations collected car wash water, which was analyzed thoroughly. pH, total suspended solids, total dissolved solids, oil & grease, chemical oxygen demand (COD), biochemical oxygen demand, chlorides, and sulfates were measured. Chemical treatment used alum, while physical treatment used sawdust and sugarcane bagasse. Sample A contains wash water from 2- and 4-wheelers, while sample B has only 4-wheeler wash water. The empirical results show that physical treatment filter bed porosity, surface area, and height affect substance sorption. COD reduction for wood dust and sugarcane in sample A is 91.59% and 90.70%, while in sample B it is 81.40% and 86.70%. COD and oil & grease concentration were measured at 3, 6, and 9 cm filter columns. The percentage reduction in COD and oil & grease was related to filter material penetration. COD, oil, and grease removal effectiveness increases with filter bed depth. Alum's COD reduction is 89.10 in sample A and 87.50 in sample B, according to coagulant dosage. Alum removes 92.40% and 93.20% of oil & grease in samples A and B. Sample A used sugarcane bagasse and sawdust to remove 94.31% and 93.40% of oil & grease. Removal percentages in sample B were 92.67% and 93.80%. Sugarcane and wood dust reduces COD and oil & grease more in sample A than sample B. Sample A had a lower alum removal rate than sample B. [ABSTRACT FROM AUTHOR]