Arsenic polluted soil remediating agent and application thereof

Abstract

The invention discloses an arsenic polluted soil remediating agent and an application thereof. A preparation method of the arsenic polluted soil remediating agent comprises steps of activation of a P11 strain, preparation of a fermentation broth, preparation of P11 dry powder, preparation of the arsenic polluted soil remediating agent and the like. The strain and culture medium materials used in the technical scheme are simple, easy to obtain and low in cost; the arsenic polluted soil remediating agent product is slightly acid, has the natural and most suitable pH (6.4+ / -0.2), the pH value isnot required to be adjusted during usage, the process is simplified, and secondarily, the pH is very close to that of common soil, so that the agent cannot harm to the soil. The arsenic polluted soilremediating agent can effectively elute arsenic in the soil and has the total removal rate of arsenic during ectopic leaching up to 95.52%; the P11 dry powder is used as a microbial fermented productand can be biodegraded, thus, the environment risk of the remediating agent remediation technology is reduced, and the agent causes small harm to the environment and cannot cause secondary pollution.

Description

Technical field [0001] The invention relates to the technical field of environmental restoration, in particular to an arsenic-contaminated soil restoration agent and its use. Background technique [0002] Soil heavy metal pollution means that due to human social practice, the content of trace (quasi) metal elements in the soil exceeds a certain standard, and the content is too high due to excessive deposition. There are two main sources of heavy metals in the soil: internal sources and external sources. Among the internal sources, due to differences in soil parent material, topography, hydrometeorology, vegetation, and land use types, there are great differences in the impact of soil heavy metal content, resulting in higher soil background values ​​in some areas. The external cause is mainly the influence of human social activities and the main source of soil heavy metal pollution, including the following aspects: atmospheric deposition, sewage and agricultural activities, indus...

AI Technical Summary

Problems solved by technology

[0006] At present, chemical leaching methods usually use chemical detergents to remediate heavy metal-contaminated soils, but often cause secondary pollution

In addition, common chelating agents (such as: disodium ethylenediaminetetraacetic acid (EDTA for short)) as an effective chelating agent have a good chelating effect on most heavy metals, but cannot form anionic heavy metals (such as As). Stable chelate, and because the wastewater contains a chelating agent (EDTA), the chelate has high stability and is difficult to treat with traditional physical and chemical methods

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