Dewaterability enhancement and sulfide mitigation of CEPT sludge by electrochemical pretreatment

被引:16
作者
Zeng, Qian [1 ]
Hao, Tianwei [1 ,2 ]
Yuan, Zhiguo [3 ]
Chen, Guanghao [1 ,4 ,5 ,6 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Clear Water Bay, Hong Kong, Peoples R China
[2] Univ Macau, Fac Sci & Technol, Dept Civil & Environm Engn, Macau, Peoples R China
[3] Univ Queensland, Adv Water Management Ctr, Brisbane, Qld 4072, Australia
[4] Hong Kong Univ Sci & Technol, Chinese Natl Engn Res Ctr Control & Treatment Hea, Hong Kong Branch, Clear Water Bay, Hong Kong, Peoples R China
[5] Hong Kong Univ Sci & Technol, Water Technol Ctr, Clear Water Bay, Hong Kong, Peoples R China
[6] Hong Kong Univ Sci & Technol, FYT Grad Sch, Wastewater Treatment Lab, Guangzhou, Peoples R China
基金
中国国家自然科学基金;
关键词
Sulfate reduction; Sludge treatment; Dewaterability enhancement; Electrochemical pretreatment; WASTE-ACTIVATED-SLUDGE; POLYMERIC SUBSTANCES EPS; ZERO-VALENT IRON; SEWAGE-SLUDGE; WATER; OXIDATION; REMOVAL; LACHNOSPIRACEAE; TECHNOLOGIES; INSIGHTS;
D O I
10.1016/j.watres.2020.115727
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 (H2S(g)) production over 5 days of anaerobic storage. Analysis of the characteristics of treated CEPT sludge revealed that carbon-EPT disintegrated sludge flocs with similar to 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. (C) 2020 Published by Elsevier Ltd.
引用
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页数:10
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