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Effects of phase separation on dewaterability promotion and heavy metal removal of sewage sludge during bioleaching
Lu, Yulan1; Wu, Rongjun1; Zhang, Jun1; Liu, Hongtao2; Dai, Yu1
2021-10-02
Source PublicationENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
ISSN0944-1344
Pages12
Corresponding AuthorZhang, Jun(zjun@glut.edu.cn)
AbstractBioleaching is of increasing interest because of its high efficiency in improving sludge dewaterability and removing heavy metals from sewage sludge. However, in traditional single-phase bioleaching, a high-efficiency level cannot be maintained continuously, wherein the microbial synergistic effect is disrupted at a low pH environment. Therefore, in this study, a series of multi-compartment-baffled flow trials were performed to assess the effects of phase separation on sludge bioleaching by comparing a two-phase trial with two single-phase trials. Energy substrate and part of the bioleached sludge were introduced separately into two compartments to form two phases, namely selection phase and bioleaching phase. The results show that phase separation apparently shortened the start-up duration of sludge bioleaching from 7 days in a single-phase bioleaching to 4 days in two-phase bioleaching. The dewaterability of bioleached sludge was also enhanced by phase separation with relative decreases of 25.0-33.3% for specific resistance to filtration and 14.2% for capillary suction time, which was attributed to lower pH values, zeta potential closer to zero, and less dissolved organic matter in bioleached sludge after two-phase bioleaching. Phase separation generally increased the removal ratios of heavy metals during sludge bioleaching by -0.79 to 2.60%, 11.06 to 15.04%, 4.45 to 11.03%, 17.98 to 23.46%, 7.20 to 9.28%, -9.22 to -2.46%, and -6.72 to -10.68% for As, Cd, Cr, Cu, Ni, Pb, and Zn, respectively. Phase separation also enriched the Acidithiobacillus spp. and reduced the inactivation of acid-tolerant fungi, which can be conducive to better synergistic effect, and therefore maintain long-term stable state in the bioleaching phase of the two-phase bioleaching process.
KeywordBiosolids Sludge pretreatment Dewatering Two-phase Baffled-flow bioreactor Acidithiobacillus spp
DOI10.1007/s11356-021-16630-3
WOS KeywordEXTRACELLULAR POLYMERIC SUBSTANCES ; ACTIVATED-SLUDGE ; ACIDITHIOBACILLUS-FERROOXIDANS ; OXIDATION ; FEASIBILITY ; REACTOR ; ENERGY
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51868011] ; Department of Science and Technology of Guangxi[2018GXNSFGA281001] ; Special Fund for Guangxi Distinguished Experts
Funding OrganizationNational Natural Science Foundation of China ; Department of Science and Technology of Guangxi ; Special Fund for Guangxi Distinguished Experts
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000702634600002
PublisherSPRINGER HEIDELBERG
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/165931
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Jun
Affiliation1.Guilin Univ Technol, Guangxi Key Lab Environm Pollut Control Theory &, 12 Jiangan Rd, Guilin 541004, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, 11A Datun Rd, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Lu, Yulan,Wu, Rongjun,Zhang, Jun,et al. Effects of phase separation on dewaterability promotion and heavy metal removal of sewage sludge during bioleaching[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2021:12.
APA Lu, Yulan,Wu, Rongjun,Zhang, Jun,Liu, Hongtao,&Dai, Yu.(2021).Effects of phase separation on dewaterability promotion and heavy metal removal of sewage sludge during bioleaching.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,12.
MLA Lu, Yulan,et al."Effects of phase separation on dewaterability promotion and heavy metal removal of sewage sludge during bioleaching".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2021):12.
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