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Reduction of excess sludge production in sequencing batch reactor through incorporation of chlorine dioxide oxidation |
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| Authors: | Wang Guanghua Sui Jun Shen Huishan Liang Shukun He Xiangming Zhang Minju Xie Yizhong Li Lingyun Hu Yongyou |
| Affiliation: | a Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration area, College of Environmental Science and Engineering, South China University of Technology, Guangzhou, 510006, PR China b Nanhai Limited Liability Development Company, Foshan, 528200, PR China c Guangzhou municipal engineering design & research institute, Guangzhou, 510060, PR China d State Key Lab of Pulp and Paper Engineering, College of Light Industry and Food Science, South China University of Technology; Guangzhou, 510640, PR China |
| Abstract: | In this study, chlorine dioxide (ClO2) instead of chlorine (Cl2) was proposed to minimize the formation of chlorine-based by-products and was incorporated into a sequencing batch reactor (SBR) for excess sludge reduction. The results showed that the sludge disintegrability of ClO2 was excellent. The waste activated sludge at an initial concentration of 15 g MLSS/L was rapidly reduced by 36% using ClO2 doses of 10 mg ClO2/g dry sludge which was much lower than that obtained using Cl2 based on similar sludge reduction efficiency. Maximum sludge disintegration was achieved at 10 mg ClO2/g dry sludge for 40 min. ClO2 oxidation can be successfully incorporated into a SBR for excess sludge reduction without significantly harming the bioreactor performance. The incorporation of ClO2 oxidation resulted in a 58% reduction in excess sludge production, and the quality of the effluent was not significantly affected. |
| Keywords: | Chlorine dioxide Excess activated sludge Sequencing batch reactor Sludge reduction Effluent quality |
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