Curing agent and restoration method for chromium-contaminated soil restoration

Abstract

The invention discloses a curing agent and a repairing method for repairing chromium-polluted soil. The curing agent of the present invention is composed of the following parts by mass: 2 to 3 parts of ferrous sulfate, 5 to 8 parts of cement, and 3 to 5 parts of porous inorganic material base material; wherein, the porous inorganic material base material is It is composed of aluminum oxide, aluminum silicate and iron oxide in a mass ratio of 1.8-2.2:5-6:2.5-3. The present invention effectively solidifies the heavy metal chromium in the polluted soil at high temperature through the combination method of reduction detoxification and curing agent, and further stabilizes the chromium in the soil through the method of high-temperature calcination in the later stage. The invention realizes the restoration and treatment of chromium-contaminated soil, has good adjustment effect, simple operation, and low cost. The chromium leaching concentration content in the repaired soil is lower than the national standard, and the repaired soil can be directly used for the production of building materials, avoiding the traditional The landfill method greatly saves land resources and has certain economic benefits.

Description

technical field [0001] The invention relates to a resource reuse method for polluted soil, in particular to a curing agent and a repair method for repairing chromium-contaminated soil. Background technique [0002] At present, soil heavy metal pollution has become a serious environmental pollution problem, and has become one of the important factors that endanger human health today. At the same time, the research on remediation and treatment of soil heavy metal pollution is the focus and hotspot of environmental pollution control research. [0003] In nature, heavy metals are difficult to be metabolized and degraded by microorganisms, and it is difficult to eliminate them in the soil. Under different conditions, the forms and valence states of heavy metals are different, and their toxicity and activity will also be significantly different. The heavy metal chromium (Cr) element It is a relatively prominent one. There are usually four forms of chromium in soil, and the toxici...

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Problems solved by technology

[0004] Phytoremediation is recognized as an ideal in-situ soil treatment technology, but there are obvious disadvantages: the selection of specific hyperaccumulative plants is complicated, and at the same time, the plants are short, with low biomass, slow growth rate, and long growth cycle; The cost is high, the cycle is long, and phytoremediation is limited by environmental conditions such as soil type, temperature, humidity and nutrition

[0007] At present, most of the relevant research focuses on acidic sulfate soil, and the research on the improvement of this soil is also relatively scattered.

For the soil polluted by heavy metals, there is still no effective solution to the problems of heavy metal content in the soil and high biological toxicity.

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