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
View PDF1 Cites 0 Cited by
  • 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 agai

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] Collected from an actual polluted site in the south, air-dried naturally, and after removing impurities, the powder was 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 soil 70 20042.65 26071.25 283.45

[0030]1. Weigh sodium dithionite, and tartaric acid is dissolved in different container waters and mixed to obtain 0.1mol / L sodium dithionite solution and 0.6mol / L tartaric acid solution;

[0031] 2. The 0.1 mol / L sodium hydrosulfite solution volume is 40%, and the 0.6 mol / L tartaric acid solution volume is 60%, and mixed to obtain a compound eluent;

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

Example Embodiment

[0037] Example 2

[0038] 1. Weigh sodium dithionite, and tartaric acid is dissolved in different container waters and mixed, respectively, to obtain the sodium dithionite solution of 0.2mol / L and the tartaric acid solution of 0.5mol / L;

[0039] 2. The 0.2mol / L sodium hydrosulfite solution volume is 50%, and the 0.05mol / L tartaric acid solution volume is 50%, and mixed to obtain a compound eluent;

[0040] 3. At room temperature, according to the solid-to-liquid ratio (g:ml) of 1:15, mix the compound eluent and 3g of the same arsenic-contaminated soil in Example 1 evenly, in a shaker at 180 r.min -1 Under shaking rinsing for 8h;

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

[0042] 5. Perform solid-liquid separation on the soil after washing with clean water, and remo...

Example Embodiment

[0045] Example 3

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

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

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

[0049] 1. Weigh sodium hydrosulfite, and tartaric acid is dissolved in different container waters and mixed, respectively, to obtain the sodium hydrosulfite solution of 0.2mol / L and the tartaric acid solution of 0.05mol / L;

[0050] 2. The 0.2mol / L sodium hydrosulfite solution volume is 80%, and the 0.4mol / L tartaric acid solution volume is 20%, and mixed to obtain a compound eluent;

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Removal rateaaaaaaaaaa
Removal rateaaaaaaaaaa
Removal rateaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap