Novel Cr(VI) polluted underground water in-situ remediation agent MOC and preparation method thereof

An in-situ remediation agent and medicament technology, which is applied in the treatment of contaminated groundwater/leachate, water pollutants, biological water/sewage treatment, etc., and can solve the problems of lack of in-situ bioremediation agents for Cr(Ⅵ) polluted groundwater , to achieve the effect of low cost, good repair effect and less secondary pollution

Inactive Publication Date: 2022-01-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a novel Cr (Ⅵ) contaminated groundwater in-situ remediation agent MOC and its preparation method, which solves the problem of lack of suitable Cr(Ⅵ) in-situ bioremediation agent for contaminated groundwater in the prior art

Method used

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  • Novel Cr(VI) polluted underground water in-situ remediation agent MOC and preparation method thereof
  • Novel Cr(VI) polluted underground water in-situ remediation agent MOC and preparation method thereof
  • Novel Cr(VI) polluted underground water in-situ remediation agent MOC and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 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.

[0040] 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).

[0041] 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 0.5mg / L, add potassium dichromate solution again with a solution volume of 200ml in the equilibrium system, so that th...

Embodiment 2

[0050] 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.

[0051] Experimental system: 250g medium sand + 100ml restoration agent MOC (ascorbic acid 0.03g, sugar cane 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).

[0052] 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 ...

Embodiment 3

[0061] 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.

[0062] Experimental system: 250g medium sand + 100ml restoration agent MOC (ascorbic acid 0.03g, sugar cane 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).

[0063] 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...

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Abstract

The invention relates to a novel Cr(VI polluted underground water in-situ remediation agent MOC and a preparation method thereof, and belongs to the technical field of polluted underground water bioremediation. The novel Cr(VI polluted underground water in-situ remediation agent MOC mainly comprises a quick-start agent, an organic carbon source (comprising a quick-release matrix and a slow-release matrix) and a chemical stabilizer, wherein the quick-start reagent is ascorbic acid, the organic carbon source is industrial syrup (quick-release matrix) and emulsified vegetable oil (slow-release matrix), and the chemical stabilizer is NaHCO3. According to the invention, when the MOC remediation agent is practically applied, the MOC remediation agent is injected into a polluted area to form an in-situ biological reaction zone, Cr(VI) with high toxicity and better mobility is reduced into Cr(III) with low toxicity and poor mobility under the action of Cr(VI) reducing bacteria, dissimilatory iron reducing bacteria and other related florae, and the Cr(III) is extremely easy to form a precipitate with good stability and is fixed on a medium; and the remediation agent has the advantages of good reduction effect, high stability, simplicity in operation and wide application range, and can still play a role in underground water with the water temperature of 10 DEG C or the pH range of 4-10.

Description

[0001] This application is a divisional application with an application date of July 26, 2019, an application number of 201910681691.9, and an invention title of "New Cr(VI) In-Situ Remediation Agent MOC and Preparation Method for Contaminated Groundwater". technical field [0002] 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 [0003] 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...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C02F3/34C02F103/06C02F101/22
CPCC02F3/34C02F2103/06C02F2101/22
Inventor赵勇胜杨新如
OwnerJILIN UNIV