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Method for restoring rice field with middle and light level arsenic pollution

A remediation method and technology for arsenic pollution, applied in the field of soil heavy metal pollution treatment, can solve the problems of large influence of soil physical and chemical properties, short remediation time, inappropriate arsenic-contaminated soil, etc. Beneficial to the growth of crops

Inactive Publication Date: 2014-02-05
曾敏 +1
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Problems solved by technology

Conventional remediation agents for heavy metal-contaminated soil have a greater impact on the physical and chemical properties of the soil, and are not suitable for the treatment of arsenic-contaminated soil. Therefore, it has become an art in the art to provide a remediation method for arsenic-contaminated paddy field soil that has little impact on soil physical and chemical properties and short remediation time. Problems that technicians need to solve urgently

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  • Method for restoring rice field with middle and light level arsenic pollution

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific embodiments, so that those skilled in the art can further understand the present invention.

[0024] Use reduced iron powder as the restoration agent, with a particle size of 100 mesh and an iron content ≥ 98%. Choose sunny days in early March (early rice), early May (middle rice), and late June (late rice) in sunny days with moderate to mild arsenic pollution. Weeding, soil preparation, and deep plowing are carried out on rice fields. According to the different degrees of arsenic pollution in paddy field soil, the application amount of remediation agent is: lightly polluted paddy fields (total arsenic content in soil exceeds 0-2 times the national soil environmental quality standard) 600 kg / mu, moderately polluted paddy fields (The total arsenic content in the soil exceeds the national soil environmental quality standard by 2-5 times) 1200 kg / mu. Before deep plowing, drain the accumulat...

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Abstract

The invention belongs to a soil heavy metal pollution processing technology field, and concretely discloses a method for restoring rice field with middle and light level arsenic pollution. The method comprises the steps of land preparation of polluted soil, deep plowing, application of a repairing agent, and balance stabilization after application of the repairing agent. The restoration method provided by the invention fixes arsenic in soil by the repairing agent, changes form and valence state of arsenic in the soil, reduces an effective arsenic content in the soil, inhibits paddy rice absorption of arsenic, thereby enabling the arsenic content to reach a national food safety standard-maximum levels of contaminations in foods (inorganic arsenic <=0.2MG / KG, GB 2726-2012). The method prepared by the invention can restore the soil before paddy rice plantation, does not affect production, and has characteristics of short restoration time, small influence on soil physical and chemical properties, and environment production.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution treatment, and specifically discloses a method for repairing rice fields with medium and light arsenic pollution. Background technique [0002] Mining, smelting, application of arsenic-containing pesticides and fertilizers, wood preservation, and irrigation of arsenic-rich surface water have caused arsenic pollution in the soil in many areas of my country. Currently, it is known that there are 17 areas in 10 provinces and cities in my country. Different degrees of arsenic pollution, and paddy field soil is one of the representatives. Rice is an important food crop in my country, and rice is the staple food in southern China. However, a large number of studies have found that the arsenic content in rice field soil near most industrial and mining areas exceeds the national soil environmental quality secondary standard (≤ 30 mg / kg, GB 15618-1995), and the arsenic content in rice pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 曾敏廖柏寒胡立琼周航雷鸣
Owner 曾敏
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