Enhancement of municipal sludge dewaterability by electrochemical pretreatment.
Enhancement of municipal sludge dewaterability by electrochemical pretreatment.
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DOI：
10.1016/j.jes.2018.03.007
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发表时间：
2019-01
影响因子：
6.9
通讯作者：
Ke Xiao;Jian-guo Deng;L. Zeng;Tao Guo;Y. Gong;Bo Yang;Xu Zhao;H. Duan
中科院分区：
文献类型：
--
作者：
Ke Xiao;Jian-guo Deng;L. Zeng;Tao Guo;Y. Gong;Bo Yang;Xu Zhao;H. Duan
电解是一种很有前途的技术，可以有效地提高污泥脱水性，同时对环境的影响可以忽略不计。为了提高电解效率，利用Ti/PbO2电极研究了电解质（NaCl、Na2SO4、NaNO3和NaClO4）对城市污泥电解预处理的影响及其机理。电解质可增强氧化自由基的产生，在减少污泥毛细管吸入时间（CST）方面表现出显着的协同效应。氯化钠与其他电解质不同，它形成大量活性氯，氧化污泥细胞，提高污泥脱水性。对表面形态以及可溶性蛋白质和多糖进行分析，以揭示污泥脱水性的潜在机制。此外，经济评估表明，在电解预处理中添加 NaCl 是提高城市污泥脱水能力的合适技术。
Electrolysis is a promising technology to improve sludge dewaterability efficiently with negligible environmental impact. To intensify the electrolytic efficiency, the effect of electrolytes (NaCl, Na2SO4, NaNO3, and NaClO4) on electrolysis pretreatment of municipal sludge and its mechanisms was investigated using Ti/PbO2electrodes. 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.