Emergency treatment method for soil polluted by chromium slag leachate

Abstract

The invention discloses an emergent disposal method for soil polluted by a filter solution of chromium slags. The emergent disposal method comprises the following steps: step I, firstly, determining the initial concentration range of total chromium in the filter solution of chromium slags on the surface of soil, when the content of the total chromium in the filter solution of chromium slags, to be disposed, is too high, diluting the filter solution of chromium slags on the surface of the soil in advance by adopting a water-dilution method, wherein the concentration is controlled within 0.157-52.3mg / L; step II, adding a dry coal ash-CaO mixing agent in the filter solution of chromium slags in the step I, and controlling the ratio of solid to liquid within 2.5-7:50; step III, sufficiently mixing the filter solution of chromium slags and the coal ash-CaO for 7-24 hours at the stirring speed of 100-300r / min. The emergent disposal method disclosed by the invention is simple to operate, low in price, small in pollution, and free from energy consumption, so that subsequent disposal burden for chromium mud is relieved; therefore, a foundation for the resource utilization of coal ash is laid.

Description

technical field [0001] The invention belongs to the field of environmental science and engineering technology, and relates to an emergency treatment method for soil polluted by chromium slag leachate. Background technique [0002] Chromium slag is a solid waste discharged during the production of chromium salts or metal chromium, which contains Cr(VI) with "three effects", so it is recognized as a hazardous solid waste. At present, most chromium slags in my country are stacked in the open air, and the anti-seepage measures are not perfect. During the precipitation process, due to the erosion of rainwater, the water-soluble and acid-soluble Cr(VI) is likely to infiltrate into the ground through the soil, or form concave holes on the ground surface. Ponds will pollute the soil, surface water and groundwater in the surrounding area, seriously affecting the health of humans and other organisms. Therefore, the remediation of the contaminated soil in the stockpiling site and the p...

AI Technical Summary

Problems solved by technology

There are many reports on the interaction between humic acid and hexavalent chromium. Because the chemical composition of humic acid is not fixed, the quantitative relationship between the redox reactions between the two is difficult to determine.

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