期刊
CHEMOSPHERE
卷 77, 期 2, 页码 269-272出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2009.07.047
关键词
Ozonation; Sludge activity; Sludge reduction; Wastewater treatment
资金
- National Natural Science Foundation of China [20777045]
- Hi-Tech Research and Development Program of China (863 Plan) [2007AA06Z347]
- National Key Basic Research Program (973 plan) [2007CB109203]
In this paper, the response mechanism of activated sludge exposed to low-dose ozone at less than 20 mg O(3) g(-1) total suspended solids (TSS) was studied by analyzing the changes in sludge activity and the evolution of C, N, P and metals from sludge following ozonation. The intracellular ATP concentration was not affected at less than 5 mg O(3) g(-1) TSS and thereafter decreased rapidly to around 60% when the ozone dose increased to 20 mg O(3) g(-1) TSS. Similarly, the efficiency of sludge solubilization initially changed a little and then increased rapidly to around 30% at an ozone dose of 20 mg O(3) g(-1) TSS. However, the activities of superoxide dismutase and protease decreased immediately upon exposure to ozone. These findings indicate that ozone firstly destroys the floc, leading to the disruption of the compact aggregates, which does not affect cells viability but induces a decrease in enzyme activities. Ozone then attacks the bacterial cells of the sludge, causing a decrease in cells viability. During ozonation, the content of carbon, nitrogen and phosphorus in the sludge matrix decreased. while the content of these elements in the micro-solids and supernatant gradually increased. Most of the released metals from the sludge matrix were found in the micro-solids. (C) 2009 Elsevier Ltd. All rights reserved.
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