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| Analysis of sludge ozonation efficiency and its influencing factors in bubble column |
| JIANG Yi-feng1, HUANG Xiao-nan1, WANG Zhi-bin1, JIN Yun-zhen2 |
1. College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;
2. Wenzhou Urban Management and Law Enforcement of Ouhai, Wenzhou 325006, China |
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Abstract In this context, a bubble column reactor was employed for sludge ozonation, where the effects of ozone concentration, sludge concentration and ozone dosage on sludge solubilization and organic release was investigated, respectively. The results showed that a high cell lysis rate was achieved but with an obvious mineralization of released COD, and it in consequence lowered the ozonation efficiency. Based on the response surface methodology, it revealed that there was interaction effects among the above influencing factors, and their respective order for sludge solubilization rate and COD release rate were:ozone concentration > sludge concentration > ozone dosage, and ozone concentration > ozone dosage > sludge concentration. Finally, the optimum operational conditions for sludge ozonation was obtained, by the related multiple quadratic regression model established and validated experimentally.
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Received: 27 February 2017
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