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Method for reducing human health risk of inorganic arsenic-contaminated soil by using layered double metal hydroxide

A layered bimetallic, polluted soil technology, applied in the field of soil pollution remediation, to achieve low cost and good effect

Inactive Publication Date: 2019-04-02
FUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to develop a method for passivation repair of inorganic arsenic polluted soil with simple operation, low cost and good effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. Pass the layered double hydroxide Friedrich's salt through a 10-mesh sieve, and store it in a cool and ventilated place for later use;

[0019] b. Collect a 0-5 cm topsoil sample from an arsenic-contaminated red soil area in southern my country, air-dry, grind, and pass through a 10-mesh sieve to be repaired, and measure its arsenic content;

[0020] c. According to the optimal dosage of restoration agent (the mass ratio of soil arsenic to Frederick's salt is 1:1000), Frederick's salt is mixed into the soil sample, so that the two are fully contacted and mixed;

[0021] d. keep the moisture content of the soil treated in step c at about 30wt%, and maintain it for 3 months under conventional climatic conditions;

[0022] e. Using the PBET method to evaluate the effect of soil passivation restoration, the bioavailability of arsenic in the small intestine of the human body was 45.9% before restoration, and decreased to 10.6% after restoration, and the human health risk ...

Embodiment 2

[0024] a. Pass the layered double hydroxide Friedrich's salt through a 10-mesh sieve, and store it in a cool and ventilated place for later use;

[0025] b. Collect a 0-5 cm topsoil sample from an arsenic-contaminated black soil area in Northeast my country, air-dry, grind, and pass through a 10-mesh sieve to be repaired, and measure its arsenic content;

[0026] c. According to the optimal dosage of restoration agent (the mass ratio of soil arsenic to Frederick's salt is 1:1000), add Frederick's salt into the soil sample, so that the two are fully contacted and mixed;

[0027] d. keep the moisture content of the soil treated in step c at about 30wt%, and maintain it for 3 months under conventional climatic conditions;

[0028] e. Using the PBET method to evaluate the effect of soil passivation restoration, the bioavailability of arsenic in the small intestine of the human body was 41.5% before restoration, and decreased to 6.5% after restoration, and the human health risk red...

Embodiment 3

[0030] a. Pass the layered double hydroxide Friedrich's salt through a 10-mesh sieve, and store it in a cool and ventilated place for later use;

[0031] b. Collect a 0-5 cm topsoil sample from an arsenic-contaminated yellow soil area in the Yangtze River Delta of my country, air-dry, grind, and pass through a 10-mesh sieve to be repaired, and measure its arsenic content;

[0032] c. According to the optimal dosage of restoration agent (the mass ratio of soil arsenic to Frederick's salt is 1:1000), add Frederick's salt into the soil sample, so that the two are fully contacted and mixed;

[0033] d. keep the moisture content of the soil treated in step c at about 30wt%, and maintain it for 3 months under conventional climatic conditions;

[0034] e. Using the PBET method to evaluate the effect of soil passivation restoration, the bioavailability of arsenic in the small intestine of the human body was 67.3% before restoration, and decreased to 13.2% after restoration, and the hu...

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PUM

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Abstract

The invention discloses a method for reducing the human health risk of inorganic arsenic-contaminated soil by using a layered double metal hydroxide. The method is characterized in that Friedel's salthaving strong binding ability to heavy metals is used as a novel soil repairing agent, inorganic arsenic-contaminated soil is subjected to passivation repairing, the application mode and the optimalapplication amount (a mass ratio of soil arsenic to Friedel's salt of 1:1000) of the repairing agent are determined based on the risk of arsenic on the human health, and after the repairing, the humanhealth risk of the soil arsenic can be decreased by more than 77%. According to the present invention, the method has advantages of simple and easy-performing repairing process, low cost and excellent effect, and can well meet the repairing requirements for arsenic-contaminated soil.

Description

technical field [0001] The invention relates to the technical field of soil pollution remediation, in particular to a method for reducing human health risks in inorganic arsenic-contaminated soil by using layered double metal hydroxides. Background technique [0002] Arsenic in the soil can enter the human body through the food chain or directly through the mouth, unintentional ingestion, inhalation, and skin contact, causing serious health hazards. With the effective control of arsenic intake in the food chain in various countries, it is unintentional for people who work outdoors for a long time without effective protective measures (farmers, miners, etc.), and children who often do outdoor activities but lack hygiene awareness. The contribution rate of the soil arsenic ingested through the mouth to the total arsenic intake of the body is getting higher and higher, and even has become the main way. The related health risks have attracted widespread attention. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 陈晓晨陈雨晴黄振佳张剑宇曾悦徐佳燕尧聪聪韩泽亮
Owner FUZHOU UNIV
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