Heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent and preparation method thereof

Abstract

The invention provides a heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent. The heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent is prepared from the following components in percentage by weight: 30-50 percent of biomass charcoal, 5-10 percent of diatomite, 5-10 percent of sodium bentonite, 5-10 percent of activated aluminum oxide, 10-20 percent of dithiocar-bamate, 5-10 percent of ethylenediaminetetraacetic acid, 5-10 percent of tartaric acid, 5-10 percent of polyacrylamide and 5-10 percent of sodium dodecyl sulfate. A preparation method for the heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent comprises the following steps: mixing the biomass charcoal, diatomite, sodium bentonite, activated aluminum oxide, ethylenediaminetetraacetic acid, tartaric acid, polyacrylamide and sodium dodecyl sulfate in mass proportion to obtain a mixture; and adding the dithiocar-bamate into the mixture in corresponding mass proportion to sufficiently mix uniformly, thereby obtaining the prepared soil restorative agent. The prepared soil restorative agent has good effect in restoring the cadmium, lead and arsenic compound contaminated soil.

Description

Technical field: [0001] The invention belongs to the technical field of soil pollution restoration, and in particular relates to a heavy metal cadmium, lead and arsenic compound polluted soil restoration agent and a preparation method thereof. Background technique: [0002] According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the overall situation of the national soil environment is not optimistic, the soil pollution in some areas is relatively serious, the quality of the soil environment of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland are prominent. . Man-made activities such as industry, mining, agriculture, and high background values ​​of the soil environment are the main causes of soil pollution or exceeding standards. The total exceeding rate of national soil is 16.1%, of which the proportions of slightly, lightly...

AI Technical Summary

Problems solved by technology

[0005] At present, the treatment methods for soil heavy metal pollution mainly include immobilization / stabilization, leaching, soil washing, electrokinetic remediation, chemical reduction, phytoremediation, and microbial remediation. There are generally problems such as low remediation efficiency and high treatment costs.

Traditional remediation methods such as landfill, leaching, electrochemistry, etc. have a large amount of engineering, high cost, and often lead to soil structure damage and loss of some nutrients