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Using activated peroxymonosulfate by electrochemically generated Fe-II for conditioning and dewatering of anaerobically digested sludge
Yang, Min; Hasaer, B.; Bai, Yaohui; Liu, Ruiping; Hu, Chengzhi; Qu, Jiuhui
2020-07-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume391Pages:1-11
AbstractTo avoid the unfavorable SO4-center dot consumption by excessive Fe-II in traditional Fe-II-activated peroxymonosulfate (PMS) system, this study investigates the conditioning performance of the electrochemical-Fe-II activated PMS, i.e., E-Fe-II-PMS, towards anaerobically digested sludge (ADS) by comparing with chemical-Fe-II activated PMS (C-Fe-II-PMS). At equilibrium pH of 6.0, the capillary suction time (CST) of raw ADS was decreased by 51.2% for C-Fe-II-PMS and 67.6% for E-Fe-II-PMS with the same total Fe-II dose of 25 mg/g DS. E-Fe-II-PMS is more efficient to degrade EPS and damage cells, and thus improves the release of bound water and intracellular water greatly. The cell viability ratios remarkably decreases from 71.8% for raw ADS to 22.6% for C-Fe-II-PMS and 10.1% for E-Fe-II-PMS. Moreover, E-Fe-II-PMS significantly reduces the total PN contents to 41.9% and the total PS contents to 43.8% for EPS fraction. The Fe2+ concentrations in supernatant was determined to be 191.3 mg/L for C-Fe-II-PMS and much lower of 36.9 mg/L for E-Fe-II-PMS after 15 min reaction, and the continuous introduction of Fe-II in E-Fe-II-PMS achieves stable Fe2+ concentrations and minimizes SO4-center dot consumption by the excessive Fe-II in C-Fe-II-PMS as much as possible. Otherwise, Fe-III-Fe-II cycling at cathode side also increases Fe-II utilization.
Department中国科学院饮用水科学与技术重点实验室
KeywordAnaerobically digested sludge (ADS) Dewaterability Electro-Fe-II activated PMS conditioning Extracellular polymeric substance (EPS) Fe-III reduction Electrochemical
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45382
Collection中国科学院饮用水科学与技术重点实验室
Recommended Citation
GB/T 7714
Yang, Min,Hasaer, B.,Bai, Yaohui,et al. Using activated peroxymonosulfate by electrochemically generated Fe-II for conditioning and dewatering of anaerobically digested sludge[J]. CHEMICAL ENGINEERING JOURNAL,2020,391:1-11.
APA Yang, Min,Hasaer, B.,Bai, Yaohui,Liu, Ruiping,Hu, Chengzhi,&Qu, Jiuhui.(2020).Using activated peroxymonosulfate by electrochemically generated Fe-II for conditioning and dewatering of anaerobically digested sludge.CHEMICAL ENGINEERING JOURNAL,391,1-11.
MLA Yang, Min,et al."Using activated peroxymonosulfate by electrochemically generated Fe-II for conditioning and dewatering of anaerobically digested sludge".CHEMICAL ENGINEERING JOURNAL 391(2020):1-11.
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