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Dewaterability enhancement and sulfide mitigation of CEPT sludge by electrochemical pretreatment
Zeng, Qian1; Hao, Tianwei1,2; Yuan, Zhiguo3; Chen, Guanghao1,4,5
2020-06-01
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume176Pages:115727
Abstract

Dewatering and sulfide control are the key challenges in treating chemically enhanced primary treatment (CEPT) sludge. In this study, an electrochemical pretreatment (EPT) approach with the input of 10 V/800 mA was explored for simultaneously improving the dewaterability of CEPT sludge and eliminating its sulfide production. The effects of different electrode materials (carbon and titanium) and EPT durations (from 5 to 15 min) were documented to reveal the underlying EPT mechanism. EPT with titanium electrodes (titanium-EPT) led to limited improvement in dewaterability and sulfide control. EPT with carbon electrodes (carbon-EPT) for 15 min, however, led to decreases in capillary suction time and specific resistance in filtration of over 80% and the suppression of about 99% of hydrogen sulfide (HS) production over 5 days of anaerobic storage. Analysis of the characteristics of treated CEPT sludge revealed that carbon-EPT disintegrated sludge flocs with ∼70% reduction in sludge particle sizes and release of aromatic and tyrosine protein-like substances, thus enhancing sludge dewaterability. The sulfur balance in the liquid and gaseous phases showed that most of the sulfur-containing compounds remained in the solid phase as aliphatic sulfur and sulfonic acid after carbon-EPT, thereby mitigating sulfide emission. While the pattern of sulfur distribution in sludge with titanium-EPT was dominated by sulfide, it was similar to the control sample. Reduction in bacteria associated with sulfide production (i.e., Lachnospiraceae) in CEPT sludge after carbon-EPT also contributed to sulfide elimination. This study demonstrates that EPT can be a superior option for simultaneously enhancing the dewaterability of CEPT sludge and mitigating its sulfide production.

KeywordDewaterability Enhancement Electrochemical Pretreatment Sludge Treatment Sulfate Reduction
DOI10.1016/j.watres.2020.115727
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering ; Environmental Sciences & Ecology ; Water Resources
WOS SubjectEngineering, Environmental ; Environmental Sciences ; Water Resources
WOS IDWOS:000528256300012
PublisherPERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Scopus ID2-s2.0-85082846278
Fulltext Access
FWCI0.93161285
Citation statistics
Document TypeJournal article
CollectionFaculty of Science and Technology
DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorHao, Tianwei
Affiliation1.Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
2.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macao
3.Advanced Water Management Centre, The University of Queensland, Brisbane, St. Lucia, 4072, Australia
4.Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution (Hong Kong Branch) and Water Technology Center, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
5.Wastewater Treatment Laboratory, FYT Graduate School, The Hong Kong University of Science and Technology, Guangzhou, China
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Zeng, Qian,Hao, Tianwei,Yuan, Zhiguo,et al. Dewaterability enhancement and sulfide mitigation of CEPT sludge by electrochemical pretreatment[J]. WATER RESEARCH,2020,176:115727.
APA Zeng, Qian,Hao, Tianwei,Yuan, Zhiguo,&Chen, Guanghao.(2020).Dewaterability enhancement and sulfide mitigation of CEPT sludge by electrochemical pretreatment.WATER RESEARCH,176,115727.
MLA Zeng, Qian,et al."Dewaterability enhancement and sulfide mitigation of CEPT sludge by electrochemical pretreatment".WATER RESEARCH 176(2020):115727.
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