Abstract：
:Both pilot and laboratory scale experiments are conducted to compare the effect of ozone and permanganate preoxidation on algae removal by alum coagulation. Both appropriately dosed preoxidants are shown to be beneficial to algae coagulation removal. This may be attributed to a decrease in cell stability; however, overdosing may cause cell lysis and the release of organics, which could interfere with algae cell coagulation. The presence of calcium further enhances the beneficial effect of preoxidation on algae coagulation; however, this phenomenon is more significant for using permanganate than ozone. It is speculated that this is due to the fact that the positively charged calcium ions can serve as bridges to hold the negatively charged MnO(2) and algal cells together. Further, this behavior also explains the superior performance of permanganate preoxidation compared to that obtained using ozone for algae coagulation removal in pilot testing, as the source water contains high calcium content.
journal_name
Chemospherejournal_title
Chemosphereauthors
Chen JJ,Yeh HH,Tseng ICdoi
10.1016/j.chemosphere.2008.10.009subject
Has Abstractpub_date
2009-02-01 00:00:00pages
840-6issue
6eissn
0045-6535issn
1879-1298pii
S0045-6535(08)01278-2journal_volume
74pub_type
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