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A method for treating copper ion-contaminated soil by adding modified restoration agent

A technology for copper ions and polluted soil, which is applied to the restoration of polluted soil and other directions, can solve the problems of easy hydrolysis of solidified products, large dosage, high cost, etc., and achieves a solidification process with simple and reliable operation, low preparation cost and low leaching rate. Effect

Active Publication Date: 2019-11-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the problems existing in the restoration of heavy metal contaminated soil mainly include: firstly, the amount of cement solidification or lime solidification is large, and the cost is high; second, the stability of cement or lime solidification alone is poor, and the cured product is easy to hydrolyze. easy to cause secondary pollution

Method used

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  • A method for treating copper ion-contaminated soil by adding modified restoration agent
  • A method for treating copper ion-contaminated soil by adding modified restoration agent
  • A method for treating copper ion-contaminated soil by adding modified restoration agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) According to the distribution ratio of each component, dry soil (g): copper solution (Cu 2+ Content mg): natural clinoptilolite (g): fly ash (g): cement (g): water (g) = 1000:1:15:5:30:150. Weigh 1000g of soil samples that are not polluted by heavy metal copper ions and pulverize them, air-dry the test soil samples, pass through a 2mm sieve after being crushed, and then accurately weigh pure copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O) Crystals and water consumption. Mix and stir the weighed crystals and water, then add the copper nitrate solution into the soil sample, mix well, and stew the material for 24-48 hours to obtain a contaminated soil sample with a copper ion concentration of 0.1% of the dry soil mass fraction, that is, copper The ion concentration is 1g / Kg, and the moisture content of the polluted soil sample is the optimal moisture content of the test soil sample.

[0043] (2) Preparation of 200g of modified zeolite powder with a particle size of...

Embodiment 2

[0052] (1) According to the ratio, dry soil (g): copper solution (Cu 2+ Content mg): natural clinoptilolite (g): fly ash (g): cement (g): water (g) = 1000:2:20:7:40:170. Weigh 1000g of soil samples that are not polluted by heavy metal copper ions and pulverize them, air-dry the test soil samples, pass through a 2mm sieve after being crushed, and then accurately weigh pure copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O) Crystals and water consumption. Mix and stir the weighed crystals and water, then add the copper nitrate solution into the soil sample, mix well, and stew the material for 24 to 48 hours to obtain a contaminated soil sample with a copper ion concentration of 0.2% of the dry soil mass fraction, that is, copper The ion concentration is 2g / Kg, and the moisture content of the polluted soil sample is the optimal moisture content of the test soil sample.

[0053] (2) Prepare 200 g of modified zeolite powder with a particle size of 200 mesh. The specific preparati...

Embodiment 3

[0062] (1) According to the ratio, dry soil (g): copper solution (Cu2+ content mg): natural clinoptilolite (g): fly ash (g): cement (g): water (g) = 1000:5: 30:10:50:190. Weigh 1000g of soil samples that are not polluted by heavy metal copper ions and pulverize them, air-dry the test soil samples, pass through a 2mm sieve after being crushed, and then accurately weigh pure copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O) Crystals and water consumption. Mix and stir the weighed crystals and water, then add the copper nitrate solution into the soil sample, mix well, and stew the material for 24-48 hours to obtain a contaminated soil sample with a copper ion concentration of 0.5% of the dry soil mass fraction, that is, copper The ion concentration is 5g / Kg, and the moisture content of the polluted soil sample is the optimal moisture content of the test soil sample.

[0063] (2) Prepare 200 g of modified zeolite powder with a particle size of 200 mesh. The specific preparation...

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Abstract

The invention relates to a method for treating copper ion polluted soil by doping in a modified repair agent. The method is characterized by comprising the following steps: the ratios of all components for repairing the copper ion polluted soil are determined, that is, the ratios of all the components corresponding to the weight of dry soil are determined: 1.5-3% of dry soil, 5-10% of fly ash content, and 3-5% of cement content. The method has the following advantages: after the method is used for repairing by 24 hours, the removal rate of copper ions of the polluted soil can reach above 94.3%, so that the repair effect is good, the environmental protection is achieved after soil repair, and the ecologic and economic benefits are important. The method is widely applied to resourceful utilization of solid wastes, in particular to treatment of heavy metal copper ion polluted soil.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of solid waste resource utilization and soil heavy metal pollution control, and in particular relates to a method for treating copper ion-contaminated soil by adding a modified restoration agent. [0003] 2. Background technology [0004] At present, the production and consumption of copper in my country are increasing continuously. The economic growth has also brought environmental pollution, especially the soil heavy metal pollution is becoming more and more serious, which not only endangers agricultural ecology, but also affects human living environment and food safety constitute a potential threat. At present, the remediation methods for heavy metal-contaminated soil mainly include: electric remediation, chemical remediation, soil leaching, air lift, heat treatment, stabilization / solidification remediation, biological remediation, etc. Among them, the stabilization / solidification repair is to mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 孙树林张德恒王成朱明杰李方
Owner HOHAI UNIV