NaClO/Fe2+ Coagulation to Improve Dewatering Performance of Algae-containing Sludge and Mechanism Investigation

被引：0

作者：

Tang Y. ^{[1
,2
]}

Wu M. ^{[1
,2
]}

Sun T. ^{[1
,2
]}

Wang M. ^{[3
]}

Zhang M. ^{[3
]}

Wang Y. ^{[3
]}

机构：

[1] School of Environmental Science and Engineering, Tongji University, Shanghai

[2] State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai

[3] Wuxi Public Utilities Environment Testing Research Institute Co. Ltd., Wuxi

来源：

Tongji Daxue Xuebao/Journal of Tongji University | 2021年 / 49卷 / 09期

关键词：

Algae-containing sludge; Algae-laden water; Dewatering; Enhanced coagulation;

D O I：

10.11908/j.issn.0253-374x.21250

中图分类号：

学科分类号：

摘要：

Sodium hypochlorite/ferrous salt coagulation can efficiently improve the dewatering performance and effect of algae-containing sludge. When the NaClO dosage was 1.5~2.0 mg·L-1, the dewatering performance reached the best. The oxidizing property of excessive NaClO damaged the integrity of algae cells. The overflow of intracellular substances hindered the release of water between cells, leading to the decrease of dewatering performance. Under the oxidation effect of NaClO, Fe2+ was transformed into Fe3+ in situ and further formed Fe(OH)3, which enhanced the coagulation effect. The hydrophilic components of extracellular polymeric substances such as protein and polysaccharides were partially degraded by NaClO, which was beneficial to the release of water between cells. Hence, the dewatering performance was improved. In addition, the removal rate of dissolved organic matter by NaClO/Fe2+ coagulation increased from 74% to 90%, and the content of humus macromolecules and aromatic compounds was also reduced, improving the purification effect of algae-laden water. © 2021, Editorial Department of Journal of Tongji University. All right reserved.

引用

页码：1226 / 1233

页数：7

共 19 条

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