Investigation of the fate of heavy metals based on process regulation-chemical reaction-phase distribution in an A-O1-H-O2 biological coking wastewater treatment system.
Regulation mechanism of typical substances including OH, CN, SCN, S, NH 3 on the distribution of heavy metals was investigated in coking wastewater treatment plant with our self-designed Anaerobic-Oxic-Hydrolytic-Oxic (A-O 1 -H-O 2) system through engineering data exposure and computational density...
| Published in: | Journal of Environmental Management Vol. 247; pp. 234 - 242 |
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| Main Authors: | , , , , , |
| Format: | Article |
| Published: |
Academic Press Inc.
Oct2019
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| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=138099297&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 138099297 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 03014797 EMJ jtl: Journal of Environmental Management issn: 03014797 maglogo: N pubinfo: dt: Oct2019 vid: 247 pid: 735 pub: Academic Press Inc. artinfo: ui: 138099297 10.1016/j.jenvman.2019.06.061 ppf: 234 ppct: 8 formats: tig: atl: Investigation of the fate of heavy metals based on process regulation-chemical reaction-phase distribution in an A-O1-H-O2 biological coking wastewater treatment system. aug: au: Kong, Qiaoping Li, Zemin Zhao, Yasi Wei, Cong Qiu, Guanglei Wei, Chaohai affil: School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, PR China su: Heavy metals Wastewater treatment Sewage disposal plants Metal content of water Density functional theory RF values (Chromatography) sug: subj: Waste treatment and disposal Sewage Treatment Facilities Water and Sewer Line and Related Structures Construction Solid Waste Landfill Heavy metals Wastewater treatment Sewage disposal plants Metal content of water Density functional theory RF values (Chromatography) keyword: Coking wastewater Distribution Regulation Waste sludge Coking wastewater Distribution Regulation Waste sludge ab: Regulation mechanism of typical substances including OH, CN, SCN, S, NH 3 on the distribution of heavy metals was investigated in coking wastewater treatment plant with our self-designed Anaerobic-Oxic-Hydrolytic-Oxic (A-O 1 -H-O 2) system through engineering data exposure and computational density functional theory (DFT) verification. The results showed that coking sludge had superior enrichment ability for heavy metals, especially for the sludge from the A and H tanks. The enrichment ratio of the 8 heavy metals including Cd, Pb, Ni, Zn, Cu, Hg, Cr and As in coking waste sludge was found to be 6232 (comparing to these in the influent wastewater of A-O 1 -H-O 2 system). The distribution of 8 heavy metals was closely related to their chemical (precipitation and/or complexation) and biochemical reaction potential with OH, CN, SCN, S, NH 3 in the A-O 1 -H-O 2 system. The regulation mechanism of these precipitation and/or complexation agents on heavy metals was confirmed by DFT calculation. The stable energy of complexes formed between typical compounds and common heavy metal ions follow the order: OH: Cu>Pb>Zn>Cd>Hg>Ni; S: Pb>Cu>Zn>Cd>Hg>Ni; CN: Zn>Cu>Cd>Hg>Pb>Ni; SCN: Zn>Cd>Pb>Hg>Cu>Ni; NH 3 : Cu>Zn>Cd>Pb>Hg>Ni, providing reference for the judgement of which metal ions were preferentially combined with the typical compounds in coking wastewater. The results of this paper indicated that the enrichment of heavy metal ions in coking wastewater can be achieved by process design combined with the control of operating conditions (dissolved oxygen, hydraulic retention time, sludge retention time and pH), basing on the nature of heavy metal ions. Finally, the separation and differential management of heavy metals can be achieved. Image 1 • Regulation of OH, S, CN, SCN and NH 3 on the distribution of heavy metals in A-O 1 -H-O 2 system was investigated. • Heavy metals in coking wastewater can be enriched by process design combined with operating conditions control. • The interaction of heavy metals and typical compounds in coking wastewater were calculated by DFT. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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