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Novel in-situ remediation agent MOC for Cr(VI) contaminated groundwater and preparation method of remediation agent MOC

An in-situ remediation agent and groundwater technology, which is applied in the treatment of polluted groundwater/leachate, water pollutants, biological water/sewage treatment, etc. It can solve the problem of lack of Cr(VI)-contaminated groundwater in-situ bioremediation agent. , to achieve the effect of low cost, long reagent life and wide source

Inactive Publication Date: 2019-11-01
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a novel Cr (Ⅵ) polluted groundwater in-situ remediation agent MOC and its preparation method, which solves the problem of lack of suitable Cr (Ⅵ) polluted groundwater in-situ bioremediation agent in the prior art

Method used

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  • Novel in-situ remediation agent MOC for Cr(VI) contaminated groundwater and preparation method of remediation agent MOC
  • Novel in-situ remediation agent MOC for Cr(VI) contaminated groundwater and preparation method of remediation agent MOC
  • Novel in-situ remediation agent MOC for Cr(VI) contaminated groundwater and preparation method of remediation agent MOC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, the potassium dichromate solution prepared in the laboratory was selected as the simulated groundwater Cr(VI) pollution, and the purchased river sand was used to simulate the aquifer medium.

[0036] Experimental system: 250g medium sand (particle size between 0.25mm-5mm) + 100ml restoration agent MOC (ascorbic acid 0.03g, sugar cane syrup 0.2g, emulsified oil 1.6g, NaHCO 3 0.15g to make 100ml solution) + 100ml 100mg / LCr(Ⅵ) (the actual Cr(Ⅵ) concentration in the system is 50mg / L after adding repair reagent).

[0037] Experimental steps: Weigh 250g of sand, add 100ml of pollution solution prepared by potassium dichromate to it, shake it well, then add repair agent MOC into the simulation device, shake it again and put it in a constant temperature incubator at 25°C for reaction . After detecting that the Cr(Ⅵ) concentration is lower than 0.5 mg / L, add potassium dichromate solution again with a solution volume of 200ml in the equilibrium system, so that t...

Embodiment 2

[0046] In this example, the potassium dichromate solution prepared in the laboratory was selected as the simulated groundwater Cr(VI) pollution, and the purchased river sand was used to simulate the aquifer medium.

[0047] Experimental system: 250g medium sand + 100ml restoration agent MOC (ascorbic acid 0.03g, sugarcane syrup 0.5g, emulsified oil 0.6g, sodium bicarbonate 0.15g to make 100ml solution) + 100ml 100mg / L Cr(Ⅵ) (after adding restoration reagent The actual Cr(Ⅵ) concentration in the system is 50mg / L).

[0048] Experimental procedure: Weigh 250g of sand, add 100ml of pollution solution prepared by potassium dichromate into it, shake it well, then add repair reagent into the simulation device, shake it again and put it in a constant temperature incubator at 25°C for reaction. After detecting that the Cr(Ⅵ) concentration is lower than 0.5mg / L, add potassium dichromate solution again with a solution volume of 200ml in the equilibrium system, so that the concentration i...

Embodiment 3

[0057] In this example, the potassium dichromate solution prepared in the laboratory was selected as the simulated groundwater Cr(VI) pollution, and the purchased river sand was used to simulate the aquifer medium.

[0058] Experimental system: 250g medium sand + 100ml restoration agent MOC (ascorbic acid 0.03g, sugarcane syrup 0.2g, emulsified oil 1.6g, sodium bicarbonate 0.15g to make 100ml solution) + 100ml 50mg / L Cr(Ⅵ) (after adding restoration reagent The actual Cr(Ⅵ) concentration in the system is 25mg / L).

[0059] Experimental procedure: Weigh 250g of sand, add 100ml of pollution solution prepared by potassium dichromate into it, shake it well, then add repair reagent into the simulation device, shake it again and put it in a constant temperature incubator at 25°C for reaction. After detecting that the Cr(Ⅵ) concentration is lower than 0.5mg / L, add potassium dichromate solution again with a solution volume of 200ml in the equilibrium system, so that the concentration is...

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Abstract

The invention relates to a novel in-situ remediation agent MOC for Cr(VI) contaminated groundwater and a preparation method of the remediation agent MOC, and belongs to the technical field of contaminated groundwater bioremediation. The remediation agent MOC is mainly composed of a fast-starting agent, an organic carbon source (which contains a fast release substrate and a slow release substrate)and a chemical stabilizer, wherein the fast-starting agent is ascorbic acid, the organic carbon source is industrial syrup (the fast release substrate) and emulsified vegetable oil (the slow release substrate), and the chemical stabilizer is NaHCO3. When the MOC remediation agent is actually applied, the MOC remediation agent is poured into a contaminated area to form an in-situ biological reaction zone, Cr(VI) with high toxicity and better migration performance is reduced into Cr(III) with low toxicity and poor migration performance under the action of related bacteria such as Cr(VI) reducingbacteria and dissimilatory iron reducing bacteria, and the Cr(III) easily forms a precipitate with good stability to be immobilized on a medium. The remediation agent MOC provided by the invention has the advantages of a good reduction effect, high stability, simple operation and a wide adaptive range, and can still play a role in the groundwater with a water temperature of 10 DEG C or a pH of 4-10.

Description

technical field [0001] The invention relates to the technical field of bioremediation of polluted groundwater, in particular to a novel in-situ remediation agent MOC for Cr(VI)-contaminated groundwater and a preparation method thereof. The remediation agent can be applied to restoration and treatment projects of Cr(VI)-contaminated groundwater. Background technique [0002] Groundwater is an important part of water resources, but with economic development, the problem of groundwater pollution is becoming more and more serious, and the pollution of groundwater is facing problems such as irreversibility and repair. In my country, Cr(Ⅵ) is one of the common pollutants in groundwater, and CrO 4 2- 、Cr 2 o 7 2- It exists in the form of anionic groups, because of its easy migration, it is easy to penetrate the vadose zone and enter the aquifer to pollute the groundwater. It is highly toxic, teratogenic, carcinogenic, and mutagenic. Based on the above problems, it is of great ...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F103/06C02F101/22
CPCC02F3/34C02F2103/06C02F2101/22
Inventor 赵勇胜杨新如
Owner JILIN UNIV
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