Synergetic Effect of Combined CaO2 and Microwave Treatment on Waste Active Sludge Dewaterability and Organic Contaminants' Removal

文献类型： 外文期刊

第一作者： Wang, Jie

作者： Wang, Jie;Liu, Xingguo;Wang, Jie;Shang, Kankan;Da, Liangjun;Zhao, Yongjing;Shang, Kankan;Zhang, Ai

作者机构：

关键词： calcium peroxide; microwave (CaO2; MW); filterability; advanced oxidation technology; organic pollutants; reactive oxygen species (ROS)

期刊名称：FRONTIERS IN ENVIRONMENTAL SCIENCE （ 影响因子：4.581； 五年影响因子：5.039 ）

ISSN：

年卷期： 2021 年 9 卷

页码：

收录情况： SCI

摘要： This study investigated the synergetic effect of the combined calcium peroxide (CaO2) and microwave (MW) treatment on waste active sludge dewatering properties and organic contaminants' removal. The optimal sludge dewaterability was obtained at CaO2 (20 mg/gVSS)/MW (70 degrees C), and the capillary suction time decreased by 52% compared with raw sludge. Further investigation indicated that total extracellular polymeric substances (EPS), tightly bound EPS, total protein, and protein present in tightly bound EPS were closely correlated with sludge dewaterability. Tryptophan, aromatic protein-like substances and humic acid-like substances were the key compounds that affect sludge dewaterability. The charge neutralization and bridge effect of cation ions were strengthened when combined with MW irradiation. In addition, it was revealed that MW facilitated CaO2 to produce more hydroxyl and superoxide anion radicals. This study confirmed CaO2/MW to be an effective way to improve sludge dewatering and remove organic pollutants from sludge.

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