An integrated, heavy industrial manufacturing facility involved in the casting of metal alloys, machining, and electroplating of large engine components was having difficulty maintaining flow through their wastewater sand filter. The filter is used to remove suspended solids from the wastewater clarifier effluent prior to discharge to the municipal sewer system. Sodium hypochlorite was applied continuously to the clarifier effluent for disinfection, but frequent sand filter malfunctions still occurred as a result of biomass accumulation on the sand media, coupled with the deposition of inorganic salts. By implementing a treatment program utilizing bromine chemistry for sand filter disinfection, the plant was able to eliminate bioaccumulation and inorganic salt deposition on filter media. As a result, sand filter maintenance downtime was reduced 50 percent, and chemical costs were reduced 40 percent. Overall, sand filter maintenance costs were reduced and wastewater compliance enhanced via increased sand filter efficiency.
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