A method for treating persistent halogenated hydrocarbons in soil with slow-release composite repairing agents

A composite repair and chemical treatment technology, applied in the field of contaminated soil remediation, can solve the problems of persistent halogenated hydrocarbon pollution, poor removal effect, environmental secondary pollution, etc., and achieve cost-friendly environment, stable structure, and no secondary pollution Effect

Active Publication Date: 2021-03-30
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a solution for the serious pollution of persistent halogenated hydrocarbons in the soil, poor removal effect of existing repair agents and repair methods, short action time, poor stability, and easy to cause secondary pollution to the environment. A method for treating persistent halogenated hydrocarbons in soil with slow-release composite repair agent with long-term strengthening repair effect

Method used

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  • A method for treating persistent halogenated hydrocarbons in soil with slow-release composite repairing agents
  • A method for treating persistent halogenated hydrocarbons in soil with slow-release composite repairing agents
  • A method for treating persistent halogenated hydrocarbons in soil with slow-release composite repairing agents

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Embodiment 1

[0042] A method for preparing a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in soil, the steps are as follows:

[0043] (1) Preparation of bacterial seed liquid and pretreatment of raw materials

[0044] Bacteria seed liquid preparation: 0.5 g of Shewanellaputrefaciens CN32 lyophilized powder was dissolved in 5 L of 0.9% physiological saline to prepare a bacterial seed liquid of Shewanellaputrefaciens CN32 with a bacterial concentration of 0.1 mg / mL.

[0045] 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.

[0046] Pretreatment of nano-zero-valent iron: put 10nm zero-valent iron powder in HCl solution with a ma...

Embodiment 2

[0054] A method for preparing a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in soil, the steps are as follows:

[0055] (1) Preparation of bacterial seed liquid and pretreatment of raw materials

[0056] 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.

[0057] 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.

[0058] Nano-zero-valent aluminum pretreatment: put 50nm nano-zero-valent aluminum powder in HCl solution with a m...

Embodiment 3

[0066] A method for preparing a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in soil, the steps are as follows:

[0067] (1) Preparation of bacterial seed liquid and pretreatment of raw materials

[0068] 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.

[0069] 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.

[0070] Pretreatment of nano-zero-valent zinc: put 100nm nano-zero-valent zinc powder in HCl solution with a mass conc...

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Abstract

The invention discloses a method for treating persistent halogenated hydrocarbons in soil by a slow-release compound remediation agent. The method includes steps: pre-ploughing contaminated soil, directly spreading a certain quantity of the slow-release compound remediation agent into ploughed soil, harrowing to well mix, watering to keep certain moisture content, and covering the soil surface with a protecting layer to realize anaerobic reduction dehalogenation reaction, wherein spreading quantity of the remediation agent is 0.05-1.5% of the dry weight of the contaminated soil, the soil ploughing depth is 25-40cm, the soil moisture content is adjusted to 50-80% of maximum field moisture capacity after spreading of the remediation agent, and remediation treatment time is 30-350d. The remediation method takes advantages of great adsorption performance of black charcoal, efficient chemical reducibility of nano zero-valence metal and dissimilatory iron reduction dehalogenation performanceof functional microorganisms to achieve physical, chemical and biological synergistic remediation effects on persistent halogenated hydrocarbon contaminated soil and has advantages of long action period, structural stability, low cost, environmental friendliness and the like.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and relates to a method for treating persistent halogenated hydrocarbons in soil with a slow-release composite remediation agent. 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 soil 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 pollutants has become a research hotspot in the field of environmental governance. [0003] At present, the technologies commonly us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10C09K17/40
CPCB09C1/08B09C1/10C09K17/40
Inventor 孟梁汪华林吉昌铃杨洁张施阳
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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