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A slow-release composite remediation agent for treating persistent halogenated hydrocarbons in groundwater and preparation method thereof

A composite restoration and long-lasting technology, applied in the direction of contaminated groundwater/leachate treatment, anaerobic digestion treatment, water/sewage treatment, etc., can solve the problem of poor removal effect of restoration agents, secondary pollution of the environment, and short action time And other problems, to achieve the effect of cost-friendly environment, no secondary pollution, long action cycle

Active Publication Date: 2019-03-01
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES +1
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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 kind of remediation agent with the advantages of serious pollution of persistent halogenated hydrocarbons in groundwater, poor removal effect, short action time, poor stability, and easy to cause secondary pollution to the environment. Slow-release composite restoration agent for treating persistent halogenated hydrocarbons in groundwater with long-term enhanced restoration effect and preparation method thereof

Method used

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  • A slow-release composite remediation agent for treating persistent halogenated hydrocarbons in groundwater and preparation method thereof
  • A slow-release composite remediation agent for treating persistent halogenated hydrocarbons in groundwater and preparation method thereof
  • A slow-release composite remediation agent for treating persistent halogenated hydrocarbons in groundwater and preparation method thereof

Examples

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Embodiment 1

[0044] A preparation method of a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in groundwater, the steps of which are as follows:

[0045] (1) Preparation of bacterial seed liquid and pretreatment of raw materials

[0046] Bacteria seed solution preparation: 0.5 g of Shewanellaputrefaciens CN32 lyophilized powder was dissolved in 5 L of 0.9% physiological saline to prepare a bacterial seed solution of Shewanellaputrefaciens CN32 with a bacterial concentration of 0.1 mg / mL.

[0047] Black carbon pretreatment: first soak the black carbon with HCl solution with a mass concentration of 1.0% for 12 hours, and then wash it with deionized water; then soak it with NaOH with a concentration of 10g / L for 12 hours, and wash it with deionized water; % normal saline for 12 hours, placed in a 121°C damp heat sterilizer for 15-30 minutes, and dried for later use.

[0048] Pretreatment of nano-zero-valent iron: put 10nm zero-valent iron powder in H...

Embodiment 2

[0056] A preparation method of a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in groundwater, the steps of which are as follows:

[0057] (1) Preparation of bacterial seed liquid and pretreatment of raw materials

[0058] Bacteria seed liquid preparation: 2.5 g of Shewanella piezotolerans WP3 freeze-dried powder was dissolved in 5 L of 0.8% physiological saline to prepare Shewanella piezotolerans WP3 bacterial seed liquid with a bacterial concentration of 0.5 mg / mL.

[0059] Black carbon pretreatment: first soak black carbon with HCl solution with a mass concentration of 3.0% for 16 hours, and then wash it with deionized water; then soak it with NaOH with a concentration of 15g / L for 16 hours, and wash it with deionized water; % normal saline for 16 hours, placed in a 125°C damp heat sterilizer for 20 minutes, and dried for later use.

[0060] Nano-zero-valent aluminum pretreatment: put 50nm nano-zero-valent aluminum powder in HCl ...

Embodiment 3

[0068] A preparation method of a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in groundwater, the steps of which are as follows:

[0069] (1) Preparation of bacterial seed liquid and pretreatment of raw materials

[0070] Bacteria seed liquid preparation: 5.0 g of Shewanella oneidensis MR-1 freeze-dried powder was dissolved in 5 L of 1.0% physiological saline to prepare a Shewanella oneidensis MR-1 bacterial seed liquid with a bacterial concentration of 1.0 mg / mL.

[0071] Black carbon pretreatment: soak the black carbon with HCl solution with a mass concentration of 5.0% for 24 hours, and then wash it with deionized water; then soak it with NaOH with a concentration of 20g / L for 24 hours, and wash it with deionized water; % normal saline for 24 hours, placed in a 120°C damp heat sterilizer for 30 minutes, and dried for later use.

[0072] Pretreatment of nano-zero-valent zinc: put 100nm nano-zero-valent zinc powder in HCl solution...

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Abstract

The invention discloses a sustained-release composite remediation agent for treating persistent halogenated hydrocarbon in groundwater and a preparation method thereof. The preparation method comprises the following steps: 1) preparing bacterial liquid saturated black carbon; 2) preparing a colloidal solution A containing locust bean gum and an organic carbon source; 3) preparing a colloidal suspension B containing locust bean gum, an organic carbon source, a nano-scale zero-valent metal and the bacterial liquid saturated black carbon; 4) carrying out a crosslinking reaction for 2-6h; and 5) carrying out a delayed crosslinking reaction for 2-6h to obtain a sustained-release composite remediation agent for treating persistent halogenated hydrocarbon in groundwater. The sustained-release composite remediation agent prepared by the method provided by the invention can utilize the good adsorption performance of black carbon, the high-efficiency chemical reducibility of the nano-scale zero-valent metal and the dissimilation iron reduction dehalogenation capability of functional microorganisms to achieve the physical, chemical and biological synergistic remediation effect of persistent halogenated hydrocarbon polluted groundwater, and has the advantages of long action period, stable structure, low cost, environmental friendliness and the like.

Description

technical field [0001] The invention belongs to the technical field of contaminated groundwater restoration, relates to a contaminated groundwater restoration agent and a preparation method thereof, in particular to a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in groundwater and a preparation method thereof. Background technique [0002] Persistent halogenated hydrocarbons (PHHs, such as organochlorine pesticides, polychlorinated biphenyls, polybrominated diphenyl ethers, etc.) are widely used in machinery manufacturing, electronic component cleaning, chemical engineering, and agricultural planting. Teratogenic, mutagenic) effects, refractory, easy migration and bioaccumulation, once it enters the groundwater environment, it will cause serious harm to the ecosystem and human health. In view of the widespread and severe hazards of persistent halogenated hydrocarbon pollution, the control and treatment technology of this kind of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F3/28C02F103/06C02F101/36
CPCB09C1/002B09C1/08B09C1/10C02F1/283C02F1/705C02F3/2806C02F3/346C02F2101/36C02F2103/06
Inventor 孟梁汪华林吉昌铃
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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