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Carbon-based materials reinforced waste activated sludge electro-dewatering for synchronous fuel treatment
Cao, Bingdi; Wang, Ruilu; Zhang, Weijun; Wu, Hanjun; Wang, Dongsheng
2019-02-01
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume149Pages:533-542
AbstractSludge treatment and disposal have become critical environmental issues in China. Electro-dewatering (ED) is an attractive technology for enhancing dewaterability and improving the sustainability of waste activated sludge (WAS) handling. However, electrically assisted mechanical dewatering processes consume more energy and the extracellular polymeric substance (EPS) dissolution caused by electro-chemical reactions can lead to clogging of the filter cloth. Carbon-based materials (CBMs) such as activated carbon and graphite have electrical conductivity and well-developed pore structures which can adsorb the biopolymers. Therefore, addition of CBMs is expected to improve WAS electro-dewatering performance for fuel treatment by enhancing sludge conductivity and filterability. In this study, we evaluated the effects of the three carbon materials (AC-0, AC-5, and graphite) on sludge electro-dewatering behavior and the flammability of sludge cakes. The results showed that CBMs promote the performance of WAS electro-dewatering, and the promoting effect of the carbon materials on the sludge electro-dewatering is proportional to the electrical conductivity of the carbon material, and carbon materials can increase the electrophoretic mobility of sludge flocs and the electro-osmotic effect. Moreover, CBMs can adsorb the dissolved EPS, thus alleviate the plugging and filtration resistance of the filter medium. The addition of CBMs also decreases the energy consumption for water removal during the electro-dewatering process and improves the calorific value and sustainable combustion time of the sludge cake. Our approach can facilitate the resource utilization of the dewatered sludge cake in electro-dewatering processes. (C) 2018 Elsevier Ltd. All rights reserved.
Department环境水质学国家重点实验室
KeywordCarbon based materials (CBMs) Electro-osmosis dewatering Extracellular polymeric substances (EPS) Electrochemical reactions Sludge dewatering
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43066
Collection环境水质学国家重点实验室
Affiliation1.Univ Chinese Acad Sci, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China
3.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China
4.Wuhan Inst Technol, Sch Chem Engn & Pharm, Wuhan 430074, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Cao, Bingdi,Wang, Ruilu,Zhang, Weijun,et al. Carbon-based materials reinforced waste activated sludge electro-dewatering for synchronous fuel treatment[J]. WATER RESEARCH,2019,149:533-542.
APA Cao, Bingdi,Wang, Ruilu,Zhang, Weijun,Wu, Hanjun,&Wang, Dongsheng.(2019).Carbon-based materials reinforced waste activated sludge electro-dewatering for synchronous fuel treatment.WATER RESEARCH,149,533-542.
MLA Cao, Bingdi,et al."Carbon-based materials reinforced waste activated sludge electro-dewatering for synchronous fuel treatment".WATER RESEARCH 149(2019):533-542.
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