Effects of lime amendment on availability of heavy metals and maturation in sewage sludge composting

Effects of lime amendment on availability of heavy metals and maturation in sewage sludge composting A batch composting study was performed to evaluate the feasibility of co-composting sewage sludge with lime, aiming at reducing the availability of heavy metals in the sludge compost. Sewage sludge with sawdust as bulking agent was amended with lime at 0, 0.63, 1.0, and 1.63% w/w, and composted for 100 days in laboratory batch reactors. The changes in temperature, pH, electrical conductivity (EC), and extractable heavy metal contents were measured while compost maturity was determined by C/N organic and cress seed germination during the composting period. Liming raised pH of compost effectively at the initial stage of composting and caused a decrease in EC through precipitation of soluble ions. Lime amendment also significantly reduced water-soluble and Diethylene triamine pentracetic acid (DTPA)-extractable metal contents. The maximum reductions were 60 and 40% for Cu, 80 and 40% for Mn, 55 and 10% for Zn, and 20 and 25% for Ni at the end of the composting period for the lime-amended sludge as compared to the control. In spite of the inhibitory effect of lime amendment on the decomposition activity of sewage sludge, all treatments reached maturation after 63 days of composting as indicated by the results of C/N organic ratio and cress seed germination test results. A lime amendment of ⩽1.0% is recommended to co-compost with sewage sludge. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Pollution Elsevier

Effects of lime amendment on availability of heavy metals and maturation in sewage sludge composting

Environmental Pollution, Volume 106 (1) – Jul 1, 1999

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Publisher
Elsevier
Copyright
Copyright © 1999 Elsevier Science Ltd
ISSN
0269-7491
D.O.I.
10.1016/S0269-7491(99)00056-1
Publisher site
See Article on Publisher Site

Abstract

A batch composting study was performed to evaluate the feasibility of co-composting sewage sludge with lime, aiming at reducing the availability of heavy metals in the sludge compost. Sewage sludge with sawdust as bulking agent was amended with lime at 0, 0.63, 1.0, and 1.63% w/w, and composted for 100 days in laboratory batch reactors. The changes in temperature, pH, electrical conductivity (EC), and extractable heavy metal contents were measured while compost maturity was determined by C/N organic and cress seed germination during the composting period. Liming raised pH of compost effectively at the initial stage of composting and caused a decrease in EC through precipitation of soluble ions. Lime amendment also significantly reduced water-soluble and Diethylene triamine pentracetic acid (DTPA)-extractable metal contents. The maximum reductions were 60 and 40% for Cu, 80 and 40% for Mn, 55 and 10% for Zn, and 20 and 25% for Ni at the end of the composting period for the lime-amended sludge as compared to the control. In spite of the inhibitory effect of lime amendment on the decomposition activity of sewage sludge, all treatments reached maturation after 63 days of composting as indicated by the results of C/N organic ratio and cress seed germination test results. A lime amendment of ⩽1.0% is recommended to co-compost with sewage sludge.

Journal

Environmental PollutionElsevier

Published: Jul 1, 1999

References

  • Changes in biological parameters during co-composting of sewage sludge and coal ash residues
    Fang, M; Wong, J.W.C; Li, G.X; Wong, M.H
  • Effect of composting on sewage sludges contaminated with heavy metals
    Garcia, C; Moreno, J.L; Hernandez, T; Costa, F
  • The effects of clay amendment and composting on metal speciation in digested sludge
    Qiao, L; Ho, G

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