In this work, a kind of low-cost and stable biochar derived from biogas residue (BRBC) was prepared and used for in-situ remediation of cadmium-contaminated soil. The biochar was prepared by the pyrolysis of biogas residue from the anaerobic digestion of food waste at 600 0C in a N2 atmosphere. The biochar was characterized by a variety of methods such as scanning electron microcopy (SEM), X-ray spectroscopy (EDS), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR) and nitrogen adsorption isotherms. Batch experiments were conducted to investigate the remediation effect of BRBC on the cadmium-contaminated soil. The change of soil properties, the bioaccessibility of Cd, the cabbage mustard biomass and the accumulation of Cd in plant were researched. Sequential extraction analysis showed that the exchangeable and carbonate-bound Cd were converted into less accessible forms after BRBC remediation. The pot experiment indicated the application of BRBC reduced the phytotoxicity of Cd and decreased the accumulation of Cd in cabbage mustard. In addition, the treatment of cadmium-contaminated with BRBC amendment could effectively improve soil pH, soil fertility, redox potential and the biomass of plant. Furthermore, the addition of BRBC into cadmium-contaminated soil increased the abundance of microorganism. After the remediation with BRBC, the activities of soil enzymes increased. Therefore, BRBC as a soil amendment was considered to be an effective, low-cost and environment-friendly passivation of Cd in contaminated soil.

Remediation of cadmium-contaminated soil by biochar derived from biogas residue

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.