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Effect of vermicomposting on concentration and speciation of heavy metals in sewage sludge with additive materials

He, Xin ; Zhang, Yaxin ; Shen, Maocai ; Zeng, Guangming ; Zhou, Mucen ; Li, Meirong

Bioresource Technology, October 2016, Vol.218, pp.867-873 [Tạp chí có phản biện]

ISSN: 0960-8524 ; DOI: 10.1016/j.biortech.2016.07.045

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  • Nhan đề:
    Effect of vermicomposting on concentration and speciation of heavy metals in sewage sludge with additive materials
  • Tác giả: He, Xin ; Zhang, Yaxin ; Shen, Maocai ; Zeng, Guangming ; Zhou, Mucen ; Li, Meirong
  • Chủ đề: Sewage Sludge ; Vermicomposting ; Heavy Metals ; Speciation ; Additive Materials
  • Là 1 phần của: Bioresource Technology, October 2016, Vol.218, pp.867-873
  • Mô tả: •Vermicomposting with additive materials could accelerate stabilization of sludge.•Total content of all heavy metals significantly reduced.•Earthworm activity sequestered heavy metals during vermicomposting.•Additive materials strongly affect heavy metal behaviors. The aim of this work was to evaluate the total content and speciation of heavy metals (As, Cr, Cd, Cu, Fe, Mn, Ni, Pb and Zn) during vermicomposting of sewage sludge by Eisenia fetida earthworm with different additive materials (soil, straw, fly ash and sawdust). Results showed that the pH, total organic carbon were reduced, while the electric conductivity and germination index increased after a combined composting – vermicomposting process. The addition of bulking agents accelerated the stabilization of sludge and eliminated its toxicity. The total heavy metals after vermicomposting in 10 scenarios were lowered as compared with the initial values and the control without amendment. BCR sequential extraction indicated that vermicomposting significantly decreased the mobility of all heavy metals by increasing the residual fractions. The activity of earthworms and appropriate addition of amendment materials played a positive role in sequestering heavy metals during the treatment of sewage sludge.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0960-8524 ; DOI: 10.1016/j.biortech.2016.07.045

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