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Effect of pH on inactivation of Microcystis aeruginosa by ozonation air in sequencing batch reactor
Author(s) -
Li Hongjing,
Yao Chenchao,
Dong Xiaoyun,
Dong Wenbo,
Fan Zhengqiu
Publication year - 2011
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.2542
Subject(s) - microcystis aeruginosa , ozone , chemistry , human decontamination , batch reactor , chlorophyll , environmental chemistry , nuclear chemistry , degradation (telecommunications) , kinetics , chlorophyll a , sequencing batch reactor , photocatalysis , photochemistry , biochemistry , effluent , environmental engineering , cyanobacteria , bacteria , waste management , organic chemistry , biology , environmental science , catalysis , telecommunications , genetics , physics , quantum mechanics , computer science , engineering
In this study, a mixture of ozone and air (ozonation air for short) was adopted for the inactivation of Microcystis aeruginosa in a sequencing batch reactor (SBR). Scanning electron microscopy of Microcysti s aeruginosa revealed damage to the cell wall and leakage of intracellular contents after ozone oxidation. Owing to the destruction of cells, the chlorophyll a released from the cells was degraded by ozone oxidation, which showed that chlorophyll a concentrations increased vastly during the first 5 min, then, decreased continuously. pH in the SBR declined with increasing time, reaching around 3.0 at the end of the cycle. It was observed that the removal efficiencies of chlorophyll a were, respectively, 68.4%, 74.5%, 86.7% and 77.9% after 90 min at pH 3.0, 7.0, 9.0 and 11.0 conditions, and the degradation of chlorophyll a accorded with the apparent first‐order kinetics. The results suggested that inactivation of Microcysti s aeruginosa was successfully performed by ozone treatment, verifying the potential of this alternative process for the decontamination of eutrophic water. Copyright © 2010 Society of Chemical Industry