Enhancement of municipal sludge dewaterability by electrochemical pretreatment

作     者：Ke Xiao Jianping Deng Li Zeng Tao Guo Yan Gong Bo Yang Xu Zhao Huabo Duan 

作者机构：College of Chemistry and Environmental Engineering Shenzhen University Shenzhen Key Laboratory of Environmental Chemistry and Ecological Remediation Shenzhen University State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Smart City Research Institute College of Civil Engineering Shenzhen University 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2019年第31卷第1期

页      面：98-104页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the National Nature Science Foundation of China (Nos.21547011,21307036,51708356) the Natural Science Foundation of Guangdong Province (No.2014A030313761) the Science and Technology Research Project of Shenzhen (Nos.ZDSYS201606061530079,JCYJ20150324141711622,JCYJ20150529164656097) 

主　　题：Municipal sludge Dewaterability Electrolysis Electrolyte Oxidative radical 

摘      要：Electrolysis is a promising technology to improve sludge dewaterability efficiently with negligible environmental impact. To intensify the electrolytic efficiency, the effect of electrolytes(NaCl, Na_2SO_4, NaNO_3, and NaClO_4) on electrolysis pretreatment of municipal sludge and its mechanisms was investigated using Ti/PbO_2 electrodes. The electrolytes,which enhanced the production of oxidative radicals, showed a significant synergetic effect in reducing the capillary suction time(CST) of sludge. NaCl was distinguished from the other electrolytes since it formed a large amount of active chlorine species, which oxidized the sludge cells to improve the sludge dewaterability. The surface morphologies as well as the soluble proteins and polysaccharides were analyzed to unravel the underlying mechanisms of sludge dewaterability. Additionally, an economic assessment showed that NaCl addition in the electrolysis pretreatment can be a suitable technique for enhancing municipal sludge dewaterability.