Effects of a heavy metal (zinc) on organic adsorption capacity and organic removal in activated sludge
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Effects of a common heavy metal (zinc) on activated sludge were studied with a sequencing batch reactor (SBR). Organic removal in activated sludge was postulated to proceed by a rapid adsorption of organics on the sludge, followed by a slower metabolic assimilation mechanism. Metal-laden waste water at a subtoxic level affected the SBR performance to different extents depending on the hydraulic retention time (HRT). Heavy metal acted as a strong competitor for active sites on the sludge, hampering organic adsorption, and affected the COD reduction efficiency under a short HRT.
Index EntriesActivated sludge COD adsorption capacity COD removal heavy metal, zinc
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