[Remediation of chromium-polluted soil using municipal solid waste compost]

A study on the feasibiltiy of remediation of Cr-polluted soil using municipal solid waste(MSW) compost was carried out. The result showed that organic matter(O.M.), Eh, pH and < 0.01 mm of clay would influence the bioavailability of chromium in the soil, and O. M. and Eh were the principal influencing factors in the dryfield and inundating soil, up to 73.40% and 55.5% of the contribution rate affecting the bioavailability of chromium, respectively. The osmosis of the soil was improved when compost was applied, but the quantity of movable chromium was reduced because chromium in soil was deoxidized and adsorbed. MSW compost could reduce the absorption of chromium by the tested plant. The yield of the plant grown in the dry soil was increased by 35.9% and the content of Cr in the plant was decreased by 48.9%. The effect was more notable in the inundating soil: 86.3% of the yield increased and 23.8% of the Cr content decreased. However, MSW compost could not increase the risk of other heavy metal pollution.