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Repairing method of low-valence heavy metal polluted soil

A remediation method and heavy metal technology, applied in the restoration of contaminated soil, etc., can solve the problems of strain cultivation, universal applicability, long cycle, etc., and achieve the effect of simple operation and cost reduction

Inactive Publication Date: 2017-01-04
天津北洋百川生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heavy metal hyperaccumulation phytoremediation is suitable for large-scale contaminated soil remediation, and its cycle is long. Microbial remediation is often used in combination with other remediation technologies to achieve the purpose of remediation, but the cultivation and universality of bacteria is a difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Leaching-adsorption restoration of low-valence heavy metal soil on the edge of paddy fields in Hunan

[0026] Preparation of polyglutamic acid-chitosan gel:

[0027] Weigh 0.5g of γ-polyglutamic acid into a 100ml beaker, add 40g of deionized water, place on a magnetic stirrer and stir until completely dissolved;

[0028] Weigh 5g chitosan, gamma-polyglutamic acid and chitosan molar ratio is 1:6, slowly add in the beaker that polyglutamic acid solution is housed, add while stirring to make chitosan evenly disperse in In polyglutamic acid solution;

[0029] Weigh 50g of 0.4mol / L acetic acid solution, slowly add it into the beaker at a uniform speed, stop stirring, react for 10 minutes, and obtain polyglutamic acid gel after crosslinking;

[0030] The gel was soaked in 3mol / L sodium hydroxide solution for 4 hours, and then washed with phosphate buffer solution to obtain γ-polyglutamic acid-chitosan gel, which could be stored in phosphate buffer solution...

Embodiment 2

[0039] Preparation of polyglutamic acid-chitosan gel:

[0040] With embodiment 1;

[0041] Leaching-adsorption remediation of low-valence heavy metal soil on the edge of paddy fields in Hunan

[0042] 1. Rinse

[0043] The low-valent heavy metal-contaminated soil near the paddy field in Hunan Province injected 2 tons of water into the contaminated soil through the injection well for leaching, and after leaching, the eluate enriched with low-valent heavy metals was extracted from the soil through the extraction well , collect the eluent, after settling, extract the supernatant to the treatment tank;

[0044] 2. Adsorption

[0045] Add polyglutamic acid-chitosan gel to the treatment tank, the feeding amount is 40kg / ton, after solid-liquid separation, circulate the treated water back to the injection well through the water pump to continue washing the soil, repeat the above steps to wash the soil 5 times

[0046]The contents of copper, cadmium and zinc in the soil before lea...

Embodiment 3

[0049] Preparation of polyglutamic acid-chitosan gel:

[0050] With embodiment 1;

[0051] Leaching-adsorption remediation of low-valence heavy metal soil on the edge of paddy fields in Hunan

[0052] 1. Rinse

[0053] The low-valent heavy metal-contaminated soil near the paddy field in Hunan Province injected 2 tons of water into the contaminated soil through the injection well for leaching, and after leaching, the eluate enriched with low-valent heavy metals was extracted from the soil through the extraction well , collect the eluent, after settling, extract the supernatant to the treatment tank;

[0054] Determination of copper, cadmium, zinc content in the filtrate. Collect the filtrate with 50kg (dry weight).

[0055] 2. Rinse

[0056] Add polyglutamic acid-chitosan gel in the treatment tank, the feeding amount is 50kg / ton, stir and absorb for 5 hours, after filtering, circulate back to the injection well through the water pump to continue washing the soil, repeat th...

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PUM

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Abstract

The invention discloses a repairing method of low-valence heavy metal polluted soil. The repairing method comprises: (1) taking water as an eluting agent, and injecting the water into the low-valence heavy metal polluted soil through an injection well; extracting an eluting solution containing rich low-valence heavy metal from the soil through an extracting well; collecting the eluting solution and carrying out sedimentation; extracting supernatant into a treatment tank; (2) directly adding polyglutamic acid-chitosan gel into the treatment tank, and stirring and adsorbing for 3 hours or more; after carrying out solid-liquid separation, recycling a treatment solution and pumping the treatment solution into the injection well; taking the treatment solution as an eluting agent for continually eluting the soil. According to the repairing method of the low-valence heavy metal polluted soil, the low-valence heavy metal in the soil can be efficiently removed, and secondary pollution to the environment is not caused; a macromolecular material has the advantages of biodegradability, biological compatibility and the like, and can be widely applied to the field of environment protection.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a leaching-adsorption restoration method for soil polluted by low-valence heavy metals. Background technique [0002] With the rapid development of the national economy, the pollution of heavy metals in soil is becoming more and more serious. Most of the heavy metals contained in soil are low-valence heavy metals, including copper, cadmium, lead, zinc, arsenic, mercury, iron and other divalent or trivalent metals. Heavy metals in the soil are difficult to migrate, have the characteristics of long residual time, strong concealment, and high toxicity, and may enter the food chain after being absorbed by crops, or enter the water and atmosphere through certain migration methods, thereby threatening human health and The reproduction of other animals, so the treatment of river sediments and soils polluted by heavy metals has always been a hot and difficult research topi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
CPCB09C1/02
Inventor 孙雨乔长晟张卫
Owner 天津北洋百川生物技术有限公司
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