Preparation method and application of hexavalent chromium contaminated soil conditioner

A technology for improving and polluting polluted soil, applied in the field of preparation of hexavalent chromium polluted soil amendment, can solve the problems of limited scope of chemical leaching method, difficult soil restoration, long restoration period, etc., to reduce toxicity and bioavailability properties, leaching toxicity reduction, the effect of changing the physical structure

Inactive Publication Date: 2016-06-22
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the scope of practical application of the chemical leaching method is limited, and it is required that the chemical leaching agent can fully contact with the hexavalent chromium in the soil and elute it. This method is only suitable for soil with a large permeability coefficient such as sandy soil, and its leaching The rinse agent must be properly disposed of after washing to avoid secondary pollution
Bioremediation includes two types of microbial remediation and phytoremediation. Microbial remediation refers to the use of microorganisms in the soil to reduce hexavalent chromium to trivalent chromium and stabilize trivalent chromium in the soil. At present, microbial remediation The technology still needs a lot of basic research work; phytoremediation technology includes plant extraction technology, plant immobilization technology and plant volatilization technology. Short project, it is difficult to achieve rapid repair in a short period of time, and there is a problem that it is difficult to repair the heavily polluted soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 6

[0025] The preparation of embodiment 1 hexavalent chromium polluted soil improver

[0026] According to the mass ratio of hexavalent chromium reductant: fly ash: coal gangue: slag: quicklime=60:30:6:3:1 mix uniformly, make 1# medicament, seal preservation, wherein, fly ash, coal gangue, The particle size of slag and quicklime is less than 1mm;

[0027] According to the mass ratio of diammonium hydrogen phosphate: ammonium dihydrogen phosphate: sodium dihydrogen phosphate: disodium hydrogen phosphate=8:15:40:37 and mix evenly to prepare 2# medicament.

Embodiment 2 6

[0028] The preparation of embodiment 2 hexavalent chromium polluted soil improver

[0029] According to the mass ratio of hexavalent chromium reductant: fly ash: coal gangue: slag: quicklime=40:40:8:8:4 mix uniformly, make 1# medicament, seal preservation, wherein, fly ash, coal gangue, The particle size of slag and quicklime is less than 1mm;

[0030] According to the mass ratio of diammonium hydrogen phosphate: ammonium dihydrogen phosphate: sodium dihydrogen phosphate: disodium hydrogen phosphate=10:10:50:30 and mix evenly to prepare 2# medicament.

Embodiment 3

[0031] Application of embodiment 3 amendments in hexavalent chromium-contaminated soil amendments

[0032] 1) Determination of hexavalent chromium leaching amount and pH in polluted soil

[0033] Preparation of extract solution: add a mixture of concentrated sulfuric acid and concentrated nitric acid with a mass ratio of 2:1 into deionized water, and adjust the pH to 3.20±0.05;

[0034] The soil sample was crushed, passed through a sieve with a pore size of 9.5mm, and the mass ratio was soil:extraction solution=1:10, turned over and oscillated for 18 hours, and then used "Solid Waste Hexavalent Chromium Determination of Diphenylcarbazide Spectrophotometry" Method (GBT15555.4-1995)" Determination of hexavalent chromium content in soil leachate;

[0035] Determine the soil pH value in accordance with the requirements of the national standard "Determination of Soil pH (NY / T1377-2007)";

[0036] 2) Improvement of chromium-contaminated soil

[0037] Crush the soil, pass it throu...

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Abstract

The invention belongs to the field of soil restoration and provides a preparation method and application of a hexavalent chromium contaminated soil conditioner. The conditioner is composed of a first chemical agent and a second chemical agent. By means of the conditioner, hexavalent chromium in soil can be efficiently reduced into trivalent chromium low in toxicity, the soil structure is improved, the acid-base property of improved soil is effectively stabilized within a certain range, long-time stability of trivalent chromium in soil is guaranteed, and environmental risk is greatly lowered. The preparation method of the conditioner is simple, hexavalent chromium in improved soil is low in leaching toxicity, appropriate in acid-base range and long in stable cycle, environmental benefits are obvious, and it is beneficial to further development and utilization of soil. The conditioner has great application significance on chemical restoration of hexavalent chromium contaminated soil, and market application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a preparation method and application of a hexavalent chromium-contaminated soil improver. Background technique [0002] Chromium-containing compounds are toxic. Among all chromium-containing compounds, hexavalent chromium is the most toxic. It 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. . [0003] There are many methods for the treatment of hexavalent chromium-contaminated soil, mainly including chemical leaching method, biological remediation method, electrical remediation method, solidification / stabilization method, chemical reduction method, etc. Among them, the scope of practical application of the chemical leaching method is limited, and it is required that the chemical leaching agent can fully...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06C09K17/08B09C1/08C09K109/00
CPCC09K17/06B09C1/08C09K17/08C09K2109/00
Inventor 王晓东高丕成闫涛杜斌魏琴孙蒙纪鹏阁
Owner UNIV OF JINAN
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