A fumigated soil remediation method for heavy metal compound polluted soil

A remediation method and composite pollution technology, applied in the field of remediation of heavy metal polluted soil, can solve the problems of height, need to be as thin as two centimeters or less, inconvenient to operate, limited in effect, etc., and achieve soil fertility improvement and cation exchange. The effect of enhanced capacity and enhanced water retention capacity

Active Publication Date: 2016-08-17
SHAOGUAN TAOLIN GREEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method takes a long time and has limited effects. It can only deal with two heavy metals recorded in cadmium and copper, and the invention has high requirements for the crushing of straw, which needs to be as fine as two centimeters or less. Therefore, the technical operation of the invention is not very convenient

Method used

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  • A fumigated soil remediation method for heavy metal compound polluted soil
  • A fumigated soil remediation method for heavy metal compound polluted soil
  • A fumigated soil remediation method for heavy metal compound polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 After the technology of the present invention is used to process, the DTPA effective state extraction effect of contaminated soil before and after fumigation (Table 1)

[0031] (1) Binding of rice straw and pre-treatment of contaminated soil;

[0032] Bind the rice straw with a water content of about 5% into straw bundles with a uniform size and a length of about 30 cm.

[0033] The top 20 cm of soil in the farmland polluted by complex heavy metals near a lead-zinc mine in Lechang, Guangdong was dried until the soil had a water content of 10%.

[0034] (2) The soil to be treated is covered with rice straw

[0035] The soil treated in (1) and the tied rice straw are prepared respectively. The rice straw and the soil layer are overlapped and stacked in multiple layers to form a circular covering method. First put a certain amount of bound rice straw on the bottom, then cover a layer of larger soil clods on top of the rice straw, place a certain amount of boun...

Embodiment 2

[0042] Before and after the soil was treated with the technology of the present invention, the multi-stage extraction test was carried out by using Tessier (Tessier et al., 1979) five-stage continuous extraction method. Tessier's five-stage extraction sequentially changes from the effective state to the carbonate binding state to the iron and manganese oxidation state to the organic state to the residue state. The ability of heavy metals to migrate and release into the environment is getting weaker and weaker, and the harm to the environmental system is getting smaller and smaller. The test results show that the chemical forms of heavy metals in the soil treated by the technology of the present invention have significantly changed compared with those before the treatment, three relatively unstable metals in the exchangeable state, carbonate binding state and iron-manganese oxidation state The sum of forms has been reduced as a percentage of all five forms, such as lead Pb ( fi...

Embodiment 3

[0043] Example 3 Field experiment in Lechang, Guangdong, to determine the biomass (Table 2) and heavy metal content (Table 3) of the aerial parts of vegetables harvested in the field

[0044] From May to August 2012, in the farmland near a lead-zinc mine in Lechang, Guangdong, a random block method was used to set up 6 blocks and 48 small quadrats of 2m×2m, with a total area of ​​about 300 square meters . Adopt the mode of lottery in each block group, have determined at random 24 small sample squares of smoked soil, these 24 sample squares are applied the present invention's technical process, contrast with other 24 small sample squares of not smoked soil, planted four Plant local vegetables that can be grown all year round, namely southern sweet bamboo mustard, four seasons Chinese cabbage, short-legged cabbage and Chinese cabbage.

[0045] During the growth period of the four kinds of vegetables, NPK compound fertilizer was applied twice regularly, and insecticides were spr...

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Abstract

The invention belongs to the technical field of remediation of heavy metal contaminated soil, and particularly relates to a soil smoldering technology for treatment and remediation of heavy metal co-contaminated soil. The soil smoldering remediation method mainly comprises the following steps: plant straws are covered with soil to form a covered body; the outer layer is a soil layer, and the straws or a mixture of straws and soil are arranged inside; the inside is kept in an anaerobic condition, and the soil smoldering treatment is then carried out. Through solidification, absorption, chelation, complexation and other various reactions, the heavy metal co-contaminated soil treated by applying the technology provided by the invention achieves a reduced proportion of chemical forms which can easily migrate and diffuse to the environment, and an increased proportion of chemical forms which are difficult to release to the environment. Therefore, environmental and ecological risks from heave metals are reduced. The technology provided by the invention can simultaneously fix multiple heave metals, reduce the heave metal absorption and accumulation by plants, effectively kill various pathogenic bacteria in soil and increase the biomass of crops, and is a simple, high-efficient, easy-to-operate and low-cost in-situ remediation technology for heavy metal co-contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and more particularly relates to a fumigated soil remediation method of heavy metal-contaminated soil. Background technique [0002] Soil pollution directly or indirectly affects human health, resulting in unacceptable environmental risks, especially heavy metal contamination of soil. Heavy metals are extremely stable in the environment, not only cannot be biodegraded, but also cannot be thermally degraded, therefore, they can easily accumulate to toxic concentrations. Moreover, the long-term accumulation of heavy metals in the soil environment will seriously affect the food chain, plants and soil microbial processes. The problem of heavy metal pollution in mining abandoned land and its surrounding soil is particularly serious. The mining abandoned land continuously releases new acidic substances through the oxidation of metal sulfides over time. Severe comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 束文圣牛莉芹周文华蒋华
Owner SHAOGUAN TAOLIN GREEN TECH
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