Abstract
Heavy metal contamination of sewage sludge hampers its recycling. Contaminated sewage sludge was amended with different proportions of biochar and vermistabilized. Biochar produced from wheat straw was added at four proportions (0%, 2%, 4%, and 6%). Ten earthworms Eisenia fetida were added, and the sludge was vermistabilized for 60 days. Heavy metal and nutrient concentrations and the accumulation of metals to E. fetida were measured. The treatment with 4% biochar was the most efficient in reducing the concentrations of heavy metals. The concentration of Cd decreased 55%, Cr 28%, Cu 30%, and Pb 21%. The concentrations of plant nutrients increased: total N 43%, total P 92%, and total K 60%. E. fetida accumulated all heavy metals in their internal tissues. The survival and reproductive rate of E. fetida improved during the vermistabilization process. We interpret that the biochar alone did not improve the decomposition process, but the main actors were the earthworms E. fetida. The most efficient proportion of biochar was 4%, not the highest tested (6%). We recommend 4% biochar to be used in the vermistabilization of heavy metal–contaminated municipal sewage sludge. The study benefits both the management of heavy metal–contaminated sewage sludge and agriculture where the final vermistabilization product can be used to improve crop production.
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The authors are thankful to the National Plan for Science, Technology and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia (Award Number 2-17-01-001-0051).
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Ameen, F., Al-Homaidan, A.A. Treatment of heavy metal–polluted sewage sludge using biochar amendments and vermistabilization. Environ Monit Assess 194, 861 (2022). https://doi.org/10.1007/s10661-022-10559-x
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DOI: https://doi.org/10.1007/s10661-022-10559-x