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Abstract:This paper investigates the applicability of biochar derived from the hydrothermal carbonization of spent wastewater treatment sludge (WW-SCB) in the removal of Cu(II) and Cr(VI) ions from contaminated soil. The effect of biochar application on soil physicochemical properties, sorption characteristics and bioremediation efficiency of Cu(II) and Cr(VI) ions was studied. The results showed that after the addition of WW-SCB biochar, electrical conductivity, which indicated the loss of ion through leaching, decreased. The pH of soil was also increased by the biochar due to the high pH of WW-SCB biochar. The results of soil tests indicated that the addition of the biochar improved the stability of soil aggregate and reduced the cohesion and plasticity of soil. The biosorption capacity of Cu(II) and Cr(VI) ions increased linearly with an increasing concentration of biochar added to contaminated soil. The addition of biochar to contaminated soil decreased the mobility of Cu(II) and Cr(VI) by improving soil adsorption. After 5 months, the removal efficiency of Cu(II) and Cr(VI) ions from contaminated soil reached 90% and 85%, respectively. The results indicate that the addition of WW-SCB biochar to contaminated soil can be used as a useful alternative to conventional pollutants remediation techniques.
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