Possible Mechanism of Sludge Disintegration by the Microwave-H₂O₂ process

Authors: Wang, Y. W.; Yan, H.; Xiao, B. Y.; Wei, Y. S.; Liu, J. X.

Source: Proceedings of the Water Environment Federation, Residuals and Biosolids 2010 , pp. 748-755(8)

Publisher: Water Environment Federation

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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.

Keywords: Hydrogen peroxide; microwave; sludge disintegration; hydroxyl radical; mechanism

Document Type: Research article

Publication date: 2010-01-01

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Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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