Compound eluting agent for arsenic-polluted soil and remediation method for arsenic-polluted soil

An arsenic pollution and eluent technology, applied in the field of arsenic-contaminated soil treatment and remediation, can solve the problems of increased environmental risks due to secondary arsenic pollution, reduced stability of arsenic-containing iron minerals, and removal of total arsenic content. There are effects of form removal, reduction of new minerals, and reduction of formation of secondary minerals

Pending Publication Date: 2022-05-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention transfers the original unstable arsenic into the stable iron ore by stabilizing the iron-rich arsenic-contaminated soil. However, this method does not remove the total arsenic content in the soil from the root cause. Changes in the stability of arsenic-containing iron minerals will reduce, which will cause the arsenic in it to be released again, which will cause secondary pollution of arsenic and increase environmental risks
[0007] According to the survey, in the typical cases of leaching and remediation of iron- and aluminum-rich arsenic-contaminated soil in southern red loam, most of the leaching agents are not effective in remediating contaminated soil, and the expected effect cannot be achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] It was collected from an actual polluted site in the south, air-dried naturally, and after removing impurities, it was pulverized and passed through a 60-mesh sieve. The basic physical and chemical properties and heavy metal content of the soil are shown in Table 1.

[0028] Table 1 Basic physical and chemical properties and heavy metal content of soil

[0029] Moisture content (%) Soil type As (mg / kg) Fe(mg / kg) Al (mg / kg) Mn (mg / kg) 10.55 red loam 70 20042.65 26071.25 283.45

[0030]1. Weigh sodium dithionite and tartaric acid and dissolve them in different containers of water and mix evenly to obtain 0.1mol / L sodium dithionite solution and 0.6mol / L tartaric acid solution;

[0031] 2. 40% by volume of 0.1mol / L sodium dithionite solution and 60% by volume of 0.6mol / L tartaric acid solution, mixed to obtain a compound rinse agent;

[0032] 3. At room temperature, according to the solid-to-liquid ratio (g:ml) of 1:10, mix the compound el...

Embodiment 2

[0038] 1. Weigh sodium dithionite and tartaric acid and dissolve them in different containers of water and mix evenly to obtain 0.2mol / L sodium dithionite solution and 0.5mol / L tartaric acid solution;

[0039] 2. Mix the 0.2mol / L sodium dithionite solution to 50% by volume, and the 0.05mol / L tartaric acid solution to 50% by volume, and mix them to obtain a compound rinse agent;

[0040] 3. At room temperature, according to the solid-to-liquid ratio (g:ml) of 1:15, mix the compound eluent with 3g of the same arsenic-contaminated soil as Example 1, and shake it in a shaker at 180 r.min -1 Shake and rinse for 8 hours;

[0041] 4. Separate the solid-liquid from the soil after shaking and washing, collect the washing waste liquid, add water to the container according to the solid-liquid ratio (g:ml) of 1:10, and continue shaking and washing in the shaker for 1 hour;

[0042] 5. Separation of solid and liquid from the soil washed with clean water, and remove the clean water to obta...

Embodiment 3

[0046] Collected from an actual polluted site in Guangzhou City, air-dried naturally, after removing impurities, pulverized, and passed through a 60-mesh sieve. The basic physical and chemical properties and heavy metal content of the soil are shown in Table 2.

[0047] Table 2 Basic physical and chemical properties of soil and heavy metal content

[0048] Moisture content (%) Soil type As (mg / kg) Fe(mg / kg) Al (mg / kg) Mn (mg / kg) 8.8 red loam 134 18874.5 29559.45 282.16

[0049] 1. Weigh sodium dithionite and tartaric acid and dissolve them in different containers of water and mix evenly to obtain 0.2mol / L sodium dithionite solution and 0.05mol / L tartaric acid solution;

[0050] 2. Mix 80% by volume of 0.2mol / L sodium dithionite solution and 20% by volume of 0.4mol / L tartaric acid solution to obtain a compound rinse agent;

[0051] 3. At room temperature, according to the solid-to-liquid ratio (g:ml) of 1:10, mix the compound eluent and 3g of ...

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Abstract

The invention discloses a compound eluting agent for arsenic-polluted soil and an arsenic-polluted soil remediation method. The compound eluting agent is composed of sodium dithionite and tartaric acid, arsenic-polluted soil and the compound eluting agent are evenly mixed, and arsenic in the soil can be effectively removed through oscillation eluting. Sodium hydrosulfite and tartaric acid are combined and compounded, the content of arsenic in polluted soil can be effectively reduced, the arsenic removal rate can reach 80% or above, and the eluting agent is simple in component, remarkable in effect and low in cost and has a very good application prospect.

Description

technical field [0001] The invention relates to the technical field of treatment and restoration of arsenic-contaminated soil, in particular to a compound eluent for arsenic-contaminated soil and a method for remediating arsenic-contaminated soil. Background technique [0002] Arsenic is a toxic and carcinogenic metalloid element, one of the five major poisons of environmental pollution, and is listed as the first category of pollutants in environmental protection standards. Domestic arsenic pollution mainly comes from wastes from the mining and smelting of arsenic-containing ores and industrial waste residues from arsenic production enterprises, and presents the characteristics of wide pollution range, deep pollution degree, and serious harm. According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the total exceeding rate of soil pollution in the country is 16.1%, and heavy...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 林亲铁何金刘煜欣范馨丹许可欢马泳杰
Owner GUANGDONG UNIV OF TECH
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