Possible Mechanism of Sludge Disintegration by the Microwave-H₂O₂ process

Author： Wang Y. W. Yan H. Xiao B. Y. Wei Y. S. Liu J. X.

ISSN： 1938-6478

Source： Proceedings of the Water Environment Federation, Vol.2010, Iss.4, 2010-01, pp. : 748-755

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Abstract

The advanced oxidation process (AOP) of microwave (MW) and H₂O₂ effectively lyses the waste activated sludge (WAS). And the possible mechanisms are investigated in detail on the basis of exploring hydroxyl radical production, flocs disintegration and the intracellular substances released. In this process, OH was generated as a result of H₂O₂ excited by the microwave radiation. Without the protection of EPS, the dominate bacteria in sludge, Gram-negative bacteria are easier to get damaged. Therefore it is proposed that the most important mechanism in MW-H₂O₂ treatment is the damages of EPS rather than microorganism cells breakage, as the individual cell is fragile.After sludge flocs were disintegration, the released materials from the intracellular gradually entered into the bulk solution following the cell breakage, and then partially convert to small molecular compounds.