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Coagulation/flocculation in dewatering of sludge: A review.

Authors
  • Wei, Hua1
  • Gao, Boqiang1
  • Ren, Jie1
  • Li, Aimin1
  • Yang, Hu2
  • 1 State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China. , (China)
  • 2 State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China. Electronic address: [email protected] , (China)
Type
Published Article
Journal
Water research
Publication Date
Oct 15, 2018
Volume
143
Pages
608–631
Identifiers
DOI: 10.1016/j.watres.2018.07.029
PMID: 30031298
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Sludge disposal is an integral part of wastewater treatment systems, and its cost usually accounts for more than half of the total operation cost. Sludge disposal technology is facing challenges and opportunities simultaneously and can still be improved. Sludge dewatering is an essential process in sludge disposal, and it is important for the effective reduction of the final processing cost. Coagulation/flocculation is a relatively mature, cost-effective, user-friendly sludge dewatering technology. In this work, coagulation/flocculation and their combinations with other pretreatments, including dewatering mechanisms, are reviewed. Various coagulants/flocculants used in sludge dewatering, including inorganic coagulants, organic synthetic and natural polymeric flocculants, and bioflocculants, are introduced in detail because coagulants/flocculants are the key in coagulation/flocculation. The different factors that influence the dewatering performance of these coagulants/flocculants are also presented briefly. Moreover, aiming at the complicated composition of sludge and its treatment difficulty, the prospects and technical developments of coagulation/flocculation in sludge dewatering are discussed. Copyright © 2018 Elsevier Ltd. All rights reserved.

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