Stabilized curing agent for heavy metal contaminated soil or solid waste treatment and treatment method

Abstract

The invention discloses a stabilized curing agent for heavy metal contaminated soil or solid waste treatment and a treatment method. The stabilized curing agent comprises the following components in parts by weight: 5 to 10 parts of a magnesium-based compound, 1 to 5 parts of a sulfur-based compound and 1 to 3 parts of an activated silicon-based compound. The treatment method comprises the following steps of sampling inspection, experimental determination of adding proportion, mixing, backfill maintenance, sealing up for safekeeping and the like. The stabilized curing agent disclosed by the invention has an efficient long-term stabilizing effect on various heavy metals such as arsenic, mercury, hexavalent chromium, lead, cadmium, nickel, tin and cyanide, the repeated acid and alkali leaching experiments prove that the stabilized and cured harmful heavy metals cannot be dissolved out again, and the defects that in the traditional technology, the treatment effect and treatment agents are greatly affected by the environment, the long-term efficacy of harmless stabilization is poor, the medicament adding amount is difficult to control and the re-dissolution of harmful heavy metals is easily caused by the high alkalinity of cement solidification and the like are overcome.

Description

technical field [0001] The invention relates to the technical field of heavy metal pollution treatment, in particular to a stabilizing and curing agent for heavy metal polluted soil or solid waste treatment and a treatment method. Background technique [0002] Heavy metals and their derivatives have the characteristics of persistence, easy migration, bioaccumulation, and biotoxicity. They are important environmental toxic and harmful substances, which pose a huge threat to human health and the ecological environment. The heavy metals referred to by these threats mainly refer to Hg, Cd, Pb, Cr and metalloid As which are significantly toxic to crops and human and animal organisms, and also include toxic pollutants such as Zn, Cu, Co, Ni, Sn. As a large amount of industrial wastewater in the city flows into the river and the dust settles in the atmosphere, many heavy metals contained in it enter the soil along with the sewage sludge. For example, the mining of metal mines, the...

AI Technical Summary

Problems solved by technology

However, the traditional stabilization and curing technology has disadvantages such as the treatment effect and the treatment agent are greatly affected by the environment, the long-term effect of harmless stability is poor, and the amount of agent addition is difficult to control.

For example, changes in soil acidity and alkalinity will cause the reaction of heavy metal compounds after treatment, leading to re-dissolution, excessive addition will also lead to the formation of easily soluble complexes, even if stable mineralization is formed after treatment, it will be due to the presence of microorganisms in the soil. Decomposition causes harmful heavy metals to migrate out again to pollute the soil

In addition, in order to achieve a long-term stabilization effect, cement is usually added as a curing agent, but the curing of the cement will cause the alkalinity of the heavy metals to be treated to increase during the curing process, resulting in the re-dissolution of the stabilized heavy metals

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