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Hexavalent chromium repairing agent and application and using method thereof

A restoration agent, hexavalent chromium technology, applied in the field of contaminated soil restoration, can solve the problems of lack of soil ecological function, high sulfate content, change of soil physical and chemical properties, etc., to save acid-base adjustment agents, wide sources, restore planting function Effect

Inactive Publication Date: 2018-12-28
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simply using these chemical agents as remediation agents has the defect that the pH value of the soil changes too much after application, which makes the long-term stability of the soil weak, and will also lead to excessively high sulfate content in the soil, thereby greatly changing the physical and chemical properties of the soil. resulting in the loss of soil ecological function

Method used

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  • Hexavalent chromium repairing agent and application and using method thereof
  • Hexavalent chromium repairing agent and application and using method thereof
  • Hexavalent chromium repairing agent and application and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 1. Hexavalent chromium polluted soil

[0073] In a hexavalent chromium-contaminated site in Shandong, hexavalent chromium-contaminated soil samples were used for the test of this agent.

[0074] Contaminated soil samples were air-dried after collection and passed through a 30-mesh sieve for later use. The restoration target of hexavalent chromium in this site is 60mg / kg. Using USEPA Method 3060A alkali digestion method, diphenylcarbazide spectrophotometric determination of hexavalent chromium. The test results of the original samples are shown in Table 1.

[0075] Table 1 The content of hexavalent chromium in the test sample of Example 1

[0076] Soil pH

Soil bulk density

Soil moisture content

Hexavalent chromium content

6.4

1.3g / cm 3

26％

2512mg / kg

[0077] 2. Hexavalent chromium repair agent

[0078] By weight, the chemical reducing agent sodium sulfide is 1% of the soil weight, the biological reducing agent orange peel ...

Embodiment 2

[0089] 1. Hexavalent chromium polluted soil

[0090] In a hexavalent chromium-contaminated site in Gansu, hexavalent chromium-contaminated soil samples were used for the test of this agent.

[0091] Contaminated soil samples were air-dried after collection and passed through a 30-mesh sieve for later use. The restoration target of hexavalent chromium in this site is 60mg / kg. Using USEPA Method 3060A alkali digestion method, diphenylcarbazide spectrophotometric determination of hexavalent chromium. The test results of the original samples are shown in Table 3.

[0092] Table 3 Hexavalent chromium content of test samples

[0093] Soil pH

[0094] 2. Hexavalent chromium repair agent

[0095] By weight, the chemical reducing agent calcium polysulfide is 1% of the soil weight, the biological reducing agent orange peel powder is 5% of the soil weight, and the biomass stabilizer peat is 5% of the soil weight.

[0096] 3. The method of using hexavalent chromium remediat...

Embodiment 3

[0105] 1. Hexavalent chromium polluted soil

[0106] In a hexavalent chromium-contaminated site in Qinghai, hexavalent chromium-contaminated soil samples were used for the test of this agent.

[0107] Contaminated soil samples were air-dried after collection and passed through a 30-mesh sieve for later use. The restoration target of hexavalent chromium in this site is 60mg / kg. Using USEPA Method 3060A alkali digestion method, diphenylcarbazide spectrophotometric determination of hexavalent chromium. The test results of the original samples are shown in Table 5.

[0108] Table 5 Hexavalent chromium content of test samples

[0109] Soil pH

Soil bulk density

Soil moisture content

Hexavalent chromium content

5.6

1.5g / cm 3

15.3％

1670mg / kg

[0110] 2. Hexavalent chromium repair agent

[0111] By weight, the chemical reducing agent is 1% of the soil weight, wherein the mass ratio of calcium polysulfide to sodium sulfide is 2.5:1, the ...

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Abstract

The invention discloses a hexavalent chromium repairing agent and an application and a using method thereof, and belongs to the technical field of contaminated soil remediation. The hexavalent chromium repairing agent is mainly composed of a chemical reducing agent, a biological reducing agent and a biomass stabilizer, wherein the chemical reducing agent is 1-5% of the soil weight, the biologicalreducing agent is 2-5% of the soil weight, and the biomass stabilizer is 2-5% of the soil weight. The agent has high reduction efficiency, long-term stability of repairing effects and low compoundingcost, and is a repairing agent capable of achieving long-term stable effect on hexavalent chromium. A using method of the repairing agent for repairing hexavalent chromium soil pollution is further provided. The chemical reducing agent, the biological reducing agent and the biomass stabilizer are creatively combined. The pH of the soil is maintained within the neutral to alkaline range by means ofthe acid-base neutralization effect of the agent and the acid-base buffering capability of a soil system, and an acid-base regulating agent is saved.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a hexavalent chromium remediation agent and its application and use method. Background technique [0002] Chromium in soil mainly exists in the form of trivalent and hexavalent. Trivalent chromium is an essential trace element for humans and animals, while hexavalent chromium is highly toxic and easily absorbed by the human body, and can accumulate in the body. The toxicity of mutations, hexavalent chromium has been listed as one of the eight most harmful chemical substances to the human body, and it is also one of the 129 key pollutants recognized by the US Environmental Protection Organization. Trivalent chromium is mainly attached to soil components in the form of hydroxide and is not easy to migrate; while hexavalent chromium mainly exists in the soil in the form of anions and has high activity and is easier to migrate in soil and its pore wa...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08B09C1/10C09K109/00
CPCB09C1/08B09C1/10B09C1/105B09C2101/00C09K17/40C09K2109/00
Inventor 苗竹吕正勇冯国杰李淑彩任贝张亮亮李来顺
Owner BEIJING GEOENVIRON ENG & TECH
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