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Physico-chemical restoration method of copper-cadmium composite contaminated soil

A technology of compound pollution and restoration method is applied in the field of physicochemical restoration of heavy metal copper and cadmium compound polluted soil, and can solve the problems of reducing heavy metal migration activity and ecotoxicity risk, secondary pollution, and inability to fundamentally remove soil heavy metals.

Active Publication Date: 2013-03-13
中科华鲁土壤修复工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the solidification and stabilization technology only reduces the migration activity of heavy metals and the risk of ecological toxicity, it cannot fundamentally remove heavy metals in the soil; and soil leaching requires a large amount of leaching agent, and the treatment of the leachate is also a major difficulty , careless handling can easily cause secondary pollution

Method used

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  • Physico-chemical restoration method of copper-cadmium composite contaminated soil
  • Physico-chemical restoration method of copper-cadmium composite contaminated soil
  • Physico-chemical restoration method of copper-cadmium composite contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Research on Technical Parameters of Complexation and Evaporation Remediation of Heavy Metal Contaminated Farmland Soil

[0047] 1 Materials and methods

[0048] 1.1 Test materials

[0049] The soil for testing was collected from a typical heavy metal-polluted farmland in the Yangtze River Delta. 22.6 g / kg, the total Cu and Cd concentrations were 297 and 10.7 mg / kg, respectively, and the hydrochloric acid extractable Cu and Cd contents were 191 and 7.20 mg / kg, respectively.

[0050] Experimental program design and implementation

[0051] In the indoor test, 200 g of the test soil was put into a glass beaker, and 40 mL of 0.1mol / L complexing agent was added and mixed well. Evaporate completely.

[0052] This experiment designed the effect of different complexing agents, different adsorption media, complexing agent addition methods, water control and other conditions on the remediation effect of complexation and evaporation on heavy metal polluted fa...

Embodiment 2

[0075] Example 2: Research on the Restoration Effect of Complex Evaporation Technology on Heavy Metal Compound Contaminated Soil

[0076] 1 Materials and methods

[0077] 1.1 Test materials

[0078] Soil for test: Collected from complex polluted farmland around an electronic waste dismantling area in the Yangtze River Delta. 2.51, 0.83, and 25.7 g / kg, hydrolyzed nitrogen, available phosphorus, and available potassium were 185, 10.3, and 188 mg / kg, respectively, and the concentrations of total Cu and Cd were 404 and 11.2 mg / kg, respectively. Hydrochloric acid extractable Cu, Cd The contents were 205 and 8.06 mg / kg respectively.

[0079] Experimental program design and implementation

[0080]Using micro-field experiments, each pot with holes was filled with 300 g of air-dried soil, and 60 mL of 0.1mol / L EDTA solution was added and stirred evenly. , placed in a 45°C oven and baked until the soil moisture evaporated completely. There were 4 repetitions for each horizo...

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Abstract

The invention discloses a physico-chemical restoration method of copper-cadmium composite contaminated soil. Heavy-metal contaminated soil is subjected to physico-chemical restoration by a complex evaporation and absorption enrichment manner. The physico-chemical restoration method comprises concrete restoration steps of: firstly, adding a complex repair reagent to the contaminated soil, then fully ploughing and evenly mixing the soil and adding water; and covering a layer of natural cellulose adsorbing medium and naturally evaporating to dry in an environmental system at 35-45 DEG C after the soil surface is smoothed, thus finishing restoration. By using the method, the removal rates of total Cu and Cd in the soil can be up to over 37% and 56.9% respectively within a relatively short time (8-12 hours), and the removal rates of extractable Cu and Cd of hydrochloric acid in the soil can be up to over 60.7% and 69.4% respectively.

Description

[0001] technical field [0002] The invention belongs to the field of environmental technology, and relates to a regeneration technology of polluted soil, in particular to a method for physicochemical restoration of heavy metal copper-cadmium composite polluted soil. [0003] Background technique [0004] With the rapid development of the economy, the pollutants discharged into the environment through human activities have increased sharply. Heavy metal pollutants such as copper and cadmium also enter the soil through mining and smelting, three waste discharges, sewage irrigation, and garbage dumps, causing serious soil heavy metal pollution. Among them, in the recycling process of e-waste, due to the process of incineration and pickling, a certain degree of complex pollution of heavy metal copper and cadmium has been produced on the surrounding farmland soil. Therefore, the treatment of heavy metal-copper-cadmium composite polluted soil has become one of the focuses in th...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 骆永明潘澄滕应
Owner 中科华鲁土壤修复工程有限公司
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