DOI: 10.1016/j.watres.2019.01.063
Scopus记录号: 2-s2.0-85061739099
论文题名: Sequential “electrochemical peroxidation – Electro-Fenton” process for anaerobic sludge treatment
作者: Olvera-Vargas H. ; Zheng X. ; Garcia-Rodriguez O. ; Lefebvre O.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 154 起始页码: 277
结束页码: 286
语种: 英语
英文关键词: Anaerobic sludge
; Electro-Fenton
; Electrochemical peroxidation
; Electrocoagulation
; Wastewater treatment
英文摘要: In this study, we present a sequential electrochemical process for integral treatment of anaerobic sludge, combining for the first time electrochemical peroxidation (ECP) and electro-Fenton (EF). In the first step, ECP (consisting of H 2 O 2 -assisted electrocoagulation with Fe electrodes) was applied as a conditioning and stabilizing method, whose synergistic electrocoagulation/Fenton oxidation effects considerably reduced the COD, TOC and total suspended solids (TSS) by 89.3%, 75.4% and 85.6%, respectively, under optimized conditions (initial pH of 5, [H 2 O 2 ]/[Fe 2+ ] dose ratio of 5, 15.38 mA cm −2 and 2 h treatment). Furthermore, total coliforms were completely killed within the first hour of treatment. In the second step, EF was successfully applied to mineralize the remaining organic fraction in the liquid effluent after dewatering, achieving 91.6% and 87.2% of COD and TOC removal, respectively, after 4 h of treatment under optimal conditions (pH 3 and 25 mA cm −2 ), while almost total COD and TOC removal was attained in 8 h. The Fe sludge generated at the end of the ECP treatment was easily dewatered by filtration and 20.9 g of nutrient-rich dry sludge were produced. The overall cost of the ECP-EF treatment was S$ 0.05 L -1 sludge. The combined effects of coagulation and Fenton oxidation during ECP revealed that the treatment efficiency is strongly dependent on the rheological properties of the sludge sample. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121944
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore
Recommended Citation:
Olvera-Vargas H.,Zheng X.,Garcia-Rodriguez O.,et al. Sequential “electrochemical peroxidation – Electro-Fenton” process for anaerobic sludge treatment[J]. Water Research,2019-01-01,154