Cadmium-arsenic composite polluted soil remediation agent

A soil remediation agent and composite pollution technology, applied in the field of cadmium-arsenic composite polluted soil remediation agents, can solve the problems of lack of cadmium-arsenic composite polluted soil remediation agents, intricate remediation agents, low remediation efficiency, etc., so as to reduce ecological environment risks and restore The effect of low cost and simple application method

Pending Publication Date: 2019-04-05
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key to this kind of technology lies in the selection of suitable agents. The current chemical repair agents mainly have the following problems: 1) the repair efficiency is not high, and the repair cycle is long; 2) the cost is high; Remediation agents for compound polluted soil are still relatively scarce

Method used

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  • Cadmium-arsenic composite polluted soil remediation agent
  • Cadmium-arsenic composite polluted soil remediation agent
  • Cadmium-arsenic composite polluted soil remediation agent

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Select ferrous sulfate, manganese oxide, fly ash, quicklime, sepiolite, calcium dihydrogen phosphate and wollastonite, weigh according to mass ratio, weigh 30 parts of ferrous sulfate, 10 parts of manganese oxide, 20 parts of pulverized coal Ash, 10 parts of quicklime, 10 parts of sepiolite, 10 parts of calcium dihydrogen phosphate, and 10 parts of wollastonite are uniformly mixed to obtain the cadmium-arsenic composite contaminated soil remediation agent of the present invention.

[0032]A heavy metal-contaminated soil in Hengyang, Hunan Province was taken. The soil was a mixture of slag and industrial and domestic waste, and was treated as solid waste. The leaching method refers to the "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T 299-2007), and the soil is leached with an overturning oscillator to detect the heavy metal content in the leachate. Compared with the "Groundwater Quality Standard" (GB / T 14848-2017), "Leach Toxicity...

Embodiment 2

[0046] Select hematite, ferrous sulfate, manganese oxide, fly ash, quicklime, sepiolite, calcium dihydrogen phosphate, weigh according to mass ratio, weigh 10 parts of hematite, 20 parts of ferrous sulfate, 10 parts of oxide Manganese, 15 parts of fly ash, 15 parts of quicklime, 15 parts of sepiolite, and 15 parts of calcium dihydrogen phosphate are uniformly mixed to obtain the cadmium-arsenic composite contaminated soil remediation agent of the present invention.

[0047] A heavy metal-contaminated soil in Hunan Province was taken. The soil was mining tailings and was treated as solid waste. The leaching method refers to the "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T 299-2007), and the soil is leached with an overturning oscillator to detect the heavy metal content in the leachate. Compared with "Groundwater Quality Standards" (GB / T 14848-2017), "Identification Standards for Hazardous Wastes Leach Toxicity Identification" (GB 5085....

Embodiment 3

[0055] Select hematite, ferrous sulfate, manganese oxide, fly ash, quicklime, sepiolite, calcium dihydrogen phosphate, weigh according to mass ratio, weigh 5 parts of hematite, 30 parts of ferrous sulfate, 10 parts of oxide Manganese, 15 parts of fly ash, 15 parts of quicklime, 10 parts of sepiolite, 10 parts of calcium dihydrogen phosphate, and 5 parts of wollastonite are uniformly mixed to obtain the cadmium-arsenic composite contaminated soil remediation agent of the present invention.

[0056] A certain heavy metal polluted soil in Hunan Province was taken, which was polluted by silver smelting. The leaching method refers to the "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T 299-2007), and the soil is leached with an overturning oscillator to detect the heavy metal content in the leachate. Compared with the "Groundwater Quality Standards" (GB / T 14848-2017), "Hazardous Waste Identification Standards Leach Toxicity Identification" (GB ...

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Abstract

The invention discloses a cadmium-arsenic composite polluted soil remediation agent, which comprises the following raw materials in parts by weight: 0-10 parts of hematite; 20-30 parts of ferrous sulfate; 10 parts of manganese dioxide; 15-20 parts of fly ash; 10-15 parts of quicklime; 10-15 parts of sepiolite; 10-15 parts of calcium dihydrogen phosphate; and 0-10 parts of wollastonite. The remediation agent enables cadmium and arsenic heavy metals to form stable chemical forms through oxidation reduction, adsorption, ion exchange, precipitation or coprecipitation and the like to reduce the migration and diffusion capability of the cadmium and arsenic heavy metals in the environment, so that the ecological environment risk of the cadmium and arsenic heavy metals is reduced; and the remediation agent has the advantages of high remediation efficiency for cadmium-arsenic composite polluted soil, short remediation period, low remediation cost, easily available raw material components and simple application method, so that the agent is one of the few remediation agents in the industry that simultaneously act on yin and yang heavy metal ions.

Description

technical field [0001] The invention relates to soil remediation technology, in particular to a cadmium-arsenic compound polluted soil remediation agent. Background technique [0002] The 2014 "National Soil Pollution Survey Bulletin" shows that the total rate of national soil exceeding the standard is 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted sites are 11.2%, 2.3%, 1.5% and 1.1%, respectively. Inorganic pollutants are the main type of pollution, followed by organic pollutants, and compound pollutants account for 82.8% of the total. In the inorganic pollution, cadmium, mercury, arsenic, copper, lead, chromium, zinc, and nickel were 7.0%, 1.6%, 2.7%, 2.1%, 1.5%, 1.1%, 0.9%, and 4.8%, among which, the rate of cadmium pollution point exceeding the standard is significantly higher than that of other heavy metals, and the distribution of pollution area in the country is the largest. Arsenic pollution is also a worldwide problem. The t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06
CPCC09K17/06
Inventor 谭文峰杨正论汪明霞黄传琴熊娟侯静涛
Owner HUAZHONG AGRI UNIV
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