Compound passivator of heavy metal contaminated soil and preparation method and application of compound passivator

A technology of polluted soil and heavy metals, applied in the field of soil pollution restoration, can solve the problems of low restoration efficiency, high cost, and high treatment cost, and achieve the effect of improving the ability of water and fertilizer retention, reducing the concentration of salt, and improving the physical structure

Active Publication Date: 2018-05-04
YUNNAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Treatment methods for heavy metal pollution in soil mainly include immobilization / stabilization, leaching, soil washing, electrokinetic remediation, chemical reduction, phytoremediation, and microbial remediation, which generally have problems such as low remediation efficiency and high treatment costs.
Traditional remediation methods such as landfill, leaching, electrochemistry, etc. have a large amount of engineering, high cost, and often lead to soil structure damage and loss of some nutrients

Method used

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  • Compound passivator of heavy metal contaminated soil and preparation method and application of compound passivator
  • Compound passivator of heavy metal contaminated soil and preparation method and application of compound passivator
  • Compound passivator of heavy metal contaminated soil and preparation method and application of compound passivator

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Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1 Passivator and its preparation

[0038] Passivator is made up of each component of following percentage by weight:

[0039] Slaked lime 8.0-10.0%, modified diatomite 25.0-30.0%, modified phosphogypsum 35.0-40.0%, and biochar 25-30.0%.

[0040] Preferred passivating agent is made up of each component of following percentage by weight:

[0041] Slaked lime 8.6%, modified diatomite 26.7%, modified phosphogypsum 36.9%, biochar 27.8%.

[0042] The preparation method of above-mentioned passivating agent, comprises the following steps:

[0043] (1) The preparation method of the biochar: the mixture obtained by mixing straw and calcium oxide at a mass ratio of 30:1 with straw and calcium oxide is a raw material, and in a semi-closed granular carbonization furnace, the pyrolysis temperature is 500 Under the condition of ~550°C, pyrolyze for 30-40 minutes, and after cooling, the solid powder with a particle size of 2mm or less obtained by crushing with a pulverize...

Embodiment 2

[0048] Cd has strong migration ability in the environment and long-lasting biological toxicity. In 1972, the United Nations Food and Agriculture Organization (FAO) and the World Health Organization (WTO) Joint Expert Committee pointed out in a report on the toxicity of food contamination that Cd poisoning is a food pollutant second only to aflatoxin and arsenic, and Cd can affect the normal health of plants. Growth and development, absorption and accumulation of nutrients and food safety. In this embodiment, heavy metal Cd is used as a research element to determine the passivation agent formula and resistance control effect.

[0049] Add CdCl to soil 2 2.5H 2 O, make the Cd level in the soil reach 30ppm, then use the artificially polluted soil to do a pot experiment, plant the cruciferous plant pakchoi, add different amounts of passivating agents to the air-dried soil, and analyze the edible part of the harvested pakchoi after planting for 50 days Cd content. Specific resu...

Embodiment 3

[0067] After a lot of experimental research, the present invention found that the use of biomass charcoal and modified diatomite can be used as effective adsorbents for anions and cations, improve the buffering capacity of the soil, reduce the concentration of salt in the soil, and can also be chelated or complexed Heavy metal ions relieve their toxicity and improve the ability of the substrate to retain water and fertilizer. Moreover, some improved substances are themselves a class of solid waste, and this method of treating waste with waste has good comprehensive benefits. The modified phosphogypsum selected by the present invention has similar effects. Slaked lime has a good effect of raising soil pH value, and it is cheap and easy to obtain.

[0068] In this example, the passivator was prepared by mixing 8.6% of slaked lime, 26.7% of modified diatomite, 36.9% of modified phosphogypsum, and 27.8% of biochar. 1.5% passivation agent in air-dried soil weight is the experiment...

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Abstract

The invention relates to a compound passivator of heavy metal contaminated soil and a preparation method and application of the compound passivator of heavy metal contaminated soil. The compound passivator comprises 8.0 to 10.0% of slaked lime, 25.0 to 30.0% of modified diatomite, 35.0 to 40.0% of modified phosphogypsum and 25 to 30.0% of biomass carbon in percentage by weight. The use amount of the compound passivator varies according to the soil contamination degree, generally within 1.5% to 2.0%. The preparation of the compound passivator is prepared by mixing the slaked lime, the modifieddiatomite, the modified phosphogypsum and biomass carbon proportionally; the compound passivator disclosed by the invention has a good application effect in remediation of cadmium, lead, zinc and copper compound contaminated soil by a synergistic action of multiple different passivation mechanism components, further can improve the vegetable quality and reduce crop absorption of pesticide residues, and is suitable for remediation of the large-area heavy metal contaminated soil, including the remediation of heavy metal contaminated farmland soil near industrial and mining areas and contaminatedsites in heavy metal production enterprises. The compound passivator can passivate various heavy metal elements and has high passivation efficiency.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to a composite passivator suitable for passivation remediation of heavy metal polluted soil, a preparation method and application thereof. technical background [0002] According to the National Soil Pollution Survey Bulletin, the soil pollution in my country is dominated by inorganic pollution, among which heavy metal elements have a relatively high rate of exceeding the standard. Soil pollution not only becomes a constraint factor for economic development, but also affects food safety and human health. Therefore, heavy metal pollution Soil remediation and prevention has gradually become the focus of widespread concern in society. [0003] Soil is the material basis for the survival and development of human beings. However, with the rapid advancement of industrialization and urbanization, my country is facing increasingly severe soil environmental secu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06B09C1/08A01B79/02C09K101/00C09K109/00
CPCA01B79/02B09C1/08C09K17/06C09K2101/00C09K2109/00
Inventor 张乃明陶亮夏运生包立
Owner YUNNAN AGRICULTURAL UNIVERSITY
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