Seasonal variability of heavy metal content and its chemical speciation in excess sludge by vermi-stabilization
Vermifiltration system has been reported to enhance sludge degradation and relieve the potential risks of heavy metals, whereas few studies focus on the seasonal variability of heavy metal content and its chemical speciation in excess sludge by vermi-stabilization. The results of this study showed t...
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| Veröffentlicht in: | IOP conference series. Earth and environmental science 2017-01, Vol.52 (1), p.12073 |
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| creator | Mu, H Zhao, Y X Li, Y Zhang, X D Hua, D L Zhao, C H |
| description | Vermifiltration system has been reported to enhance sludge degradation and relieve the potential risks of heavy metals, whereas few studies focus on the seasonal variability of heavy metal content and its chemical speciation in excess sludge by vermi-stabilization. The results of this study showed that total contents of Zn, Pb, Cr and the treatment efficiency of vermifilter were higher in summer and lower in winter due to the temperature effect. While Cu was observed to not be dependent on season. Further investigation using a five-step fractionation procedure to evaluate the main chemical speciations of metals in the sludge showed that there were similar variations in the five fractions (F1-F5) between each season, which indicated that the chemical speciation of heavy metals were most affected by vermifiltration technique than seasonal factor. The transformations among the five fractions suggested that the vermifiltration significantly reduced the mobility and bioavailability of Zn and Pb due to their increased stable fractions and decreased unstable fractions. The higher stable fraction of Cu led to the stable morphology in sludge, which favoured the insignificant variations with seasons. |
| doi_str_mv | 10.1088/1742-6596/52/1/012073 |
| format | Article |
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The results of this study showed that total contents of Zn, Pb, Cr and the treatment efficiency of vermifilter were higher in summer and lower in winter due to the temperature effect. While Cu was observed to not be dependent on season. Further investigation using a five-step fractionation procedure to evaluate the main chemical speciations of metals in the sludge showed that there were similar variations in the five fractions (F1-F5) between each season, which indicated that the chemical speciation of heavy metals were most affected by vermifiltration technique than seasonal factor. The transformations among the five fractions suggested that the vermifiltration significantly reduced the mobility and bioavailability of Zn and Pb due to their increased stable fractions and decreased unstable fractions. The higher stable fraction of Cu led to the stable morphology in sludge, which favoured the insignificant variations with seasons.</description><identifier>ISSN: 1755-1307</identifier><identifier>EISSN: 1755-1315</identifier><identifier>DOI: 10.1088/1742-6596/52/1/012073</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Bioavailability ; Chemical speciation ; Chromium ; Copper ; Fractionation ; Heavy metal content ; Heavy metals ; Lead ; Morphology ; Seasonal variations ; Seasons ; Sludge ; Speciation ; Stabilization ; Temperature effects</subject><ispartof>IOP conference series. Earth and environmental science, 2017-01, Vol.52 (1), p.12073</ispartof><rights>Published under licence by IOP Publishing Ltd</rights><rights>2017. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c3023-8aca10faba0ad93329e7ec60283a45ac43c3ebca127f7191a07d160bbdc826673</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.1088/1742-6596/52/1/012073/pdf$$EPDF$$P50$$Giop$$Hfree_for_read</linktopdf><link.rule.ids>314,780,784,27924,27925,38868,38890,53840,53867</link.rule.ids></links><search><creatorcontrib>Mu, H</creatorcontrib><creatorcontrib>Zhao, Y X</creatorcontrib><creatorcontrib>Li, Y</creatorcontrib><creatorcontrib>Zhang, X D</creatorcontrib><creatorcontrib>Hua, D L</creatorcontrib><creatorcontrib>Zhao, C H</creatorcontrib><title>Seasonal variability of heavy metal content and its chemical speciation in excess sludge by vermi-stabilization</title><title>IOP conference series. 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Earth and environmental science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mu, H</au><au>Zhao, Y X</au><au>Li, Y</au><au>Zhang, X D</au><au>Hua, D L</au><au>Zhao, C H</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Seasonal variability of heavy metal content and its chemical speciation in excess sludge by vermi-stabilization</atitle><jtitle>IOP conference series. Earth and environmental science</jtitle><addtitle>IOP Conf. Ser.: Earth Environ. 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| subjects | Bioavailability Chemical speciation Chromium Copper Fractionation Heavy metal content Heavy metals Lead Morphology Seasonal variations Seasons Sludge Speciation Stabilization Temperature effects |
| title | Seasonal variability of heavy metal content and its chemical speciation in excess sludge by vermi-stabilization |
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