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This paper studied in detail the sludge disintegration and supernatant changes during ozonation and investigated the possible mechanisms. Ozone effectively lysed the sludge. The most important mechanism is proposed to be damages of microorganism cells. The ozone dose of 50mgO 3 /gDS was found optimal for sludge lysis; 25mgO 3 /gDS achieved only 10.4% sludge lysis after 90min and 80mgO...
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