Abstract：
:In this paper, the response mechanism of activated sludge exposed to low-dose ozone at less than 20mgO(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 5mgO(3)g(-1) TSS and thereafter decreased rapidly to around 60% when the ozone dose increased to 20mgO(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 20mgO(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.
journal_name
Chemospherejournal_title
Chemosphereauthors
Chu L,Wang J,Wang B,Xing XH,Yan S,Sun X,Jurcik Bdoi
10.1016/j.chemosphere.2009.07.047subject
Has Abstractpub_date
2009-09-01 00:00:00pages
269-72issue
2eissn
0045-6535issn
1879-1298pii
S0045-6535(09)00851-0journal_volume
77pub_type
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