Chemical-biological combination repair method for Cd-B [a] P compound contaminated soil

Abstract

The invention provides a chemical-biological combination repair method for Cd-B [a] P compound contaminated soil, and the method includes the following steps: A) using 0.6mol / L citric acid solution, 20g / L beta-cyclodextrin solution and 10g / L rhamnolipid solution or any two of the solutions for compounding, using nitric acid or calcium hydroxide to adjust the pH value to 3-6 to prepare an eluent a and an eluent b; according to the chemical-biological combination repair method for the Cd-B [a] P compound contaminated soil, the Cd-B [a] P compound contaminated soil is treated by combination of chemical elution and animal and plant repair, exchangeable state, carbonate bounded state, iron and manganese oxidation state, organic state and B (a) P free dissolved state of Cd in the soil can be obviously removed, the repair method is economical, good in repair effect and suitable for use in restoration of soil in large area Cd-B [a] P compound contaminated sites, while restoration, the city environment is beautified without secondary pollution on soil, and the repair rate can reach more than 92%.

Description

technical field

[0001] The invention relates to the technical field of remediation of polluted soil, in particular to a combined chemical-biological remediation method of Cd-B[a]P composite polluted soil. Background technique

[0002] In recent years, with the acceleration of my country's industrialization and urbanization process, a large number of chemical companies have been closed, relocated or about to be decommissioned. These chemical companies have caused considerable damage due to factors such as product production and treatment, waste dumping and discharge, and chemical substance leakage. The serious site pollution problem has had a great impact on human health and environmental safety.

[0003] Some researchers investigated the pollution status of the soil near the industrial abandoned area in Liaoyang, the old electronic processing plant in Wenzhou, and a steel company in the suburbs of Nanjing, and found that cadmium (Cd) and benzo(a)pyrene (B[a]P) were Its main ...