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Minimization of Excess Sludge Production for Biological Waste Water Treatment using Activated Sludge Process

Author Affiliations

  • 1Department of Chemical Engineering, Visvesvaraya National Institute of Technology, Nagpur, MS, INDIA
  • 2Department of Chemical Engineering, Pravara Rural Engineering College, Loni, Ahmednagar, MS, INDIA

Int. Res. J. Biological Sci., Volume 1, Issue (5), Pages 13-17, September,10 (2012)


Redox potential technique can be used for minimizing sludge. Redox potential is nothing but any oxidation-reduction (redox) reaction can be divided into two half, one in which another chemical species undergoes reduction. If a half reaction is written as a reduction, the driving force is the reduction potential. If the half-reaction is written as oxidation, the driving force is the oxidation potential related to the reduction potential by a sign change. So the redox potential is the reduction/oxidation potential of a compound measured under standards conditions against a standard reference half-cell. In biological systems the standard redox potential is defined at pH – 7.0 versus the hydrogen electrode and partial pressure of hydrogen = 1 bar. In these project efforts was made to determine the feasibility of activated sludge process (ASP) for the treatment of synthetic wastewater and to develop simple design criteria under local conditions. A bench scale model comprising of an aeration tank and final clarifier was used for this purpose. Synthetic wastewater prepared in the laboratory using Glucose as the main source of carbon and the required nutrients were treated using mixed culture microorganisms on a batch as well as continuous manner. The reduction in COD and the increase in cell production analyzed. The characteristics of the settled sludge were determined by sludge volume index (SVI). The sludge produced during the treatment has separately treated with water having negative redox potential to study the effect on the reduction of the excel production. Known quantity of sludge was mixed with different volumes of redox potential solution to study the percentage reduction with and without stirring as a function of time. The results were used to optimize the time and percentage reduction.


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