Applied Biochemistry and Biotechnology

, Volume 57, Issue 1, pp 845–849 | Cite as

Effects of a heavy metal (zinc) on organic adsorption capacity and organic removal in activated sludge

  • Hong Chua
  • F. L. Hua
Session 5 Environmental Biotechnology


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 Entries

Activated sludge COD adsorption capacity COD removal heavy metal, zinc 


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Copyright information

© Humana Press Inc. 1996

Authors and Affiliations

  • Hong Chua
    • 1
  • F. L. Hua
    • 2
  1. 1.Department of Civil and Structural EngineeringThe Hong Kong Polytechnic UniversityHung HomHong Kong
  2. 2.Environmental Protection Bureau of Jiangsu ProvinceNanjingChina

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