脱水
活性污泥
化学
化学工程
活性炭
Zeta电位
混合液悬浮物
胞外聚合物
电化学
比表面积
束缚水
材料科学
废物管理
废水
电极
催化作用
吸附
纳米颗粒
物理化学
细菌
工程类
生物
遗传学
生物膜
岩土工程
有机化学
分子
作者
Yanting Dong,Haiping Yuan,Dongdong Ge,Nanwen Zhu
出处
期刊:Water Research
[Elsevier]
日期:2022-07-01
卷期号:220: 118704-118704
被引量:72
标识
DOI:10.1016/j.watres.2022.118704
摘要
Sludge dewatering is an essential process for reduction of sludge volume to decrease cost of ultimate disposal. In this study, a novel method using activated carbon (AC) strengthening electrochemical (EC) treatment (EC/AC) was adopted to improve greatly sludge dewaterability. It was shown that capillary suction time (CST) and water content of dewatered sludge cake (Wc) were reduced to 55.9 ± 1.24 s and 64.3 ± 1.23%, respectively, under the optimal conditions of EC voltage 20 V, EC time 30 min and 0.2 g/g dry solid (DS) AC. AC with rich functional groups as "the third electrode" intensified electrooxidation by forming multiple microelectrodes and electron transfer capacity and conductivity of sludge were strengthened by AC in EC system, which were illustrated by electrochemical analysis. It could be found that zeta potential and particle size were increased and surface roughness was reduced after EC/AC treatment intensifying sludge hydrophobicity. Form the results of rheological behaviors of sludge, flowability was strengthened and viscosity was weakened under the conditioning of EC/AC. Besides, colloidal force and gel-like network strength were lessened, which was also verified by organic matters and percentage of inviable cells. At the same time, intracellular matters were released and degraded and bound water was released converting into free water. In addition, sludge compressibility and structural strength were increased and porous structure was formed facilitating water outflow via addition of mesoporous AC as skeleton builder, which eventually led to an improved separation efficiency of solid-water and sludge dewaterability. The results of heavy metals suggested that sludge cake after EC/AC treatment was favorable for land application.
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