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Method for eluting and renovating soil with heavy metal-organic matter combined pollution

A technology of composite pollution and heavy metals, applied in the restoration of polluted soil, etc., can solve the problems of large amount of eluent and high repair cost, and achieve the effect of reducing the amount of eluent, small environmental risk, and reducing repair cost.

Inactive Publication Date: 2008-10-29
NANJING UNIV
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiency of single pollutant leaching in leaching and repairing contaminated soil technology, the present invention provides a method for rinsing and repairing heavy metal-organic compound polluted soil, It can be used to remediate soil contaminated by heavy metals and organic matter at the same time, and is used to solve the problems of large amount of eluent used and high remediation cost in the soil leaching remediation method

Method used

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  • Method for eluting and renovating soil with heavy metal-organic matter combined pollution
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  • Method for eluting and renovating soil with heavy metal-organic matter combined pollution

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Take 1g of the soil samples from the mining area in 2.5 and put them into 22ml glass centrifuge tubes with Teflon lids, add ethyl lactate of different concentrations to 5%-20% by weight in another container, and EDDS (EDDS / Cu molar ratio = 2) Solution, adjust the pH of the leaching system to neutral, and prepare it as a leaching agent. According to the dry weight of the soil, add the leaching agent to wash the soil for 24 hours according to the dry weight of the soil. Supernatant: shake at 25±1℃ for 24h, centrifuge after equilibration, take the supernatant to analyze the content of phenanthrene and pyrene by HPLC, and determine the Cu in the extract by atomic absorption 2+ Concentration, three parallels in each group, to study the extraction effect of ethyl lactate-EDDS-water (ethanol-EDDS-water) on polycyclic aromatic hydrocarbons and Cu in compound contaminated soil. The supernatant is first adsorbed by the organic adsorption resin, and then passed through the cation exch...

Embodiment 2

[0035] The basic treatment method is the same as in Example 1, and the treatment amount and reagent amount are different.

[0036] The speciation analysis adopts the EU BCR continuous extraction method, which is divided into four forms: acid extractable state, oxide-bound state, organic matter-bound state, and residue state.

[0037] The first state (exchangeable state and carbonate-bound state) (B1): Take 0.5g soil samples before and after restoration respectively, place them in a 50ml polyethylene centrifuge tube, add 20ml 0.1mol / L HAc, and shake at room temperature for 16h, 3000rpm Centrifuge for 20 minutes, take the supernatant, add 0.2ml concentrated nitric acid, and determine.

[0038]The second state (iron-manganese oxidation combined state) (B2): add 20ml 0.1mol / L NH to the upper solid phase 2 OH·HCl, shake at room temperature for 16 hours, centrifuge at 3000 rpm for 20 minutes, take the supernatant, add 0.2 ml of concentrated nitric acid, and determine.

[0039] The third...

Embodiment 3

[0044] Take 1g of Tangshan copper contaminated soil in a 22ml Corex glass centrifuge tube, add 10ml of eluent (EDDS / Cu=2, ethyl lactate 20%, soil-water ratio 1:10), and use NaNO 3 The ionic strength of the adjustment system is 0.01M, and the pH of the adjustment system is 7 with NaOH and HCl. Oscillate at constant temperature for 12h. Centrifuge at 4000r / min for 10min, and take the supernatant to determine the copper content by atomic absorption. Take 0.5g of NDA-150 resin in the leachate and shake for 0.5h. The leachate after resin treatment is filtered and used for the second cycle leaching. Taking into account the loss of the eluent caused by the resin adsorption process, 0.8g of Tangshan copper-contaminated soil was taken from the 22ml Corex glass centrifuge tube for the second cycle of leaching, and the resin-treated eluent was added (soil to water ratio 1:10, Ionic strength 0.01M, pH=7). Shake at constant temperature for 12h, centrifuge at 4000r / min for 10min, and take the s...

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Abstract

The invention a method for restoring the soil with combined pollution of heavy metal-organic matter by leaching; the steps are as follows: the contents of polycyclic aromatic hydrocarbon and heavy metal as well as the basic physicochemical properties of the soil are analyzed; lactic ester is diluted to 5-20 weight percent according to the contents of organic matter and polycyclic aromatic hydrocarbon in the soil, then organic ligand of ethylenediamine is added according to the content of heavy metal in the soil, and the pH value is adjusted to neuter, thus an eluent is prepared; based on the dry weight of the soil, the eluent and the soil are added according to the proportion of 10:1 to 5:1 for leaching the soil for 24 hours, and then the soil and supernatant fluid are separated; the supernatant fluid is firstly adsorbed by organic adsorption resin, then passes through cation exchange resin, and the treated eluent can be recycled. The method has the following characteristics and advantages that: (1) the eluent can restore the soil with combined pollution of heavy metal-organic matter at the same time, and the environmental risk is small; (2) after the eluent is utilized circularly, the using amount of the eluent is reduced by, thus lowering the cost of restoration.

Description

Technical field [0001] The invention relates to a leaching method for repairing soil compound pollution, and belongs to the field of soil pollution control in environmental protection. Background technique [0002] Compound pollution when inorganic and organic pollutants coexist is the current research direction and focus of compound pollution. The current research is mainly focused on the combined pollution of organic chelating agents, pesticides, petroleum hydrocarbons and aromatic compounds and heavy metals. Heavy metals and polycyclic aromatic hydrocarbons are two types of important pollutants in the soil environment. They often enter the soil environment at the same time or successively to form compound pollution. For a long time, domestic and foreign heavy metals and polycyclic aromatic hydrocarbons have been separately polluted and the microbial ecology of compound pollution between different heavy metals Toxicological effects and remediation measures have been studied mor...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 郭红岩王巍王晓蓉孙媛媛尹颖裴大平李爱民
Owner NANJING UNIV
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