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Composite medicament for repairing low concentration chromium contaminated soil and use method thereof

A technology for chromium-contaminated soil and compound chemicals is applied in the field of compound chemicals for the remediation of low-concentration chromium-contaminated soils, which can solve the problems of unsuitable large-scale soil remediation applications, poor remediation effects, and high remediation costs, thereby eliminating health risks and improving efficiency. , the effect of promoting reproduction and metabolism

Inactive Publication Date: 2018-08-17
CHINESE ACADEMY FOR ENVIRONMENTAL PLANNING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a compound agent for the restoration of low-concentration chromium-contaminated soil and its application method, which solves the technical problems of short timeliness, poor restoration effect and easy secondary pollution in the chemical reduction restoration of chromium-contaminated soil in the existing situation , In addition, it also solves the problem of high remediation cost and unsuitable for large-scale soil remediation applications

Method used

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  • Composite medicament for repairing low concentration chromium contaminated soil and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] FeSO 4 ·7H 2 O and the natural materials rich in humic acid and organic small molecular acid are mixed evenly according to 4:1 (mass ratio) to obtain the compound agent. The natural materials rich in humic acid and organic small molecular acid are orange peel, grapefruit peel, Debris of leaves mixed with powder; the application amount of the compound agent is 1% of the mass of soil polluted by low-concentration hexavalent chromium. After fully stirring and mixing, it is piled in the heterotopic repair reaction pool, and the pile is evenly replenished with water to maintain the soil moisture content. The saturated water content is 85%, and it is covered and protected with an anti-seepage film, and the reaction time is 10 to 60 days.

[0025] The bottom and side walls of the ectopic repair reaction pool are the base layer, bentonite pad, high-density polyethylene impervious membrane and long-fiber non-woven geotextile from the outside to the inside, and the top includes ...

Embodiment 2

[0028] In addition to raw material components FeSO 4 ·7H 2 O is mixed evenly with the natural material rich in humic acid and organic small molecule acid according to 4:1 (mass ratio), other is the same as embodiment 1.

Embodiment 3

[0029] Embodiment 3 (comparative embodiment)

[0030] In addition to raw material components FeSO 4 ·7H 2 O is mixed evenly with natural materials rich in humic acid and small organic molecular acids at a ratio of 1:0 (mass ratio), and the others are the same as in Example 1.

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Abstract

The invention provides a composite medicament for repairing low concentration chromium contaminated soil and a use method thereof. The composite medicament mainly contains reduction agent ferrous sulfate and natural materials rich in humic acid and small organic acids, repair effect of the same is long, and the preparation method thereof is simple. Use method of the composite medicament includes pretreatment of the contaminated soil and restoration process of an ectopic repair pond. The composite medicament for repairing low concentration chromium contaminated soil and the use method thereof have the advantages of solving the problem that chemical reduction and repair of the chromium-contaminated soil is often faced with re-precipitation of Cr(VI) (hexavalent chromium) after the repair isup to standard, and achieving long-term repair effects of repairing Cr(VI) pollution in the soil and inhibiting precipitation with the use of the novel composite slow-release medicament. Furthermore,orange peel, grapefruit peel, leaves and other sources are abundant, cost is low, and secondary pollution is effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a composite agent for remediation of low-concentration chromium-contaminated soil and a method for using the same. Background technique [0002] Chromium is widely used in industries such as metallurgy, leather manufacturing, electroplating, and wood processing. If the wastewater and solid waste generated in these industries are not properly treated, or due to accidents, leakage, and improper storage, etc., it will cause damage to natural water bodies and soils. Chromium contamination. Taking the production of chromium salt as an example, the production technology of chromium salt in my country is relatively backward, and the amount of slag produced is large. Due to the relatively weak awareness of environmental protection in the past, a considerable amount of chromium slag was directly piled up in the open air without anti-leakage treatment. Due to the hig...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08C09K17/40
Inventor 王枫董璟琦张红振雷秋霜张茜雯司绍诚
Owner CHINESE ACADEMY FOR ENVIRONMENTAL PLANNING
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