Method for treating persistent halogenated hydrocarbons in soil by slow-release compound remediation agent

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: 2018-08-24
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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  • Method for treating persistent halogenated hydrocarbons in soil by slow-release compound remediation agent
  • Method for treating persistent halogenated hydrocarbons in soil by slow-release compound remediation agent
  • Method for treating persistent halogenated hydrocarbons in soil by slow-release compound remediation agent

Examples

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Embodiment 1

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

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

[0044] Preparation of bacterial seed liquid: 0.5 g of Shewanella putrefaciens CN32 freeze-dried powder was dissolved with 5L of 0.9% normal saline to prepare Shewanella putrefaciens CN32 bacterial seed liquid with a bacterial concentration of 0.1 mg / mL.

[0045] Black carbon pretreatment: the black carbon is first soaked in HCl solution with a mass concentration of 1.0% for 12 hours, and then washed with deionized water; then soaked with 10g / L NaOH for 12 hours, and washed with deionized water; finally with a mass concentration of 0.9 After soaking in 5% normal saline for 12 hours, place it in a 121°C humid heat sterilization pot for 15-30 minutes, and dry it for later use.

[0046] Nano-zero-valent iron pretreatment: place 10nm zero-valent iron powder i...

Embodiment 2

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

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

[0056] Preparation of bacterial seed liquid: Dissolve 2.5 g of Shewanellapiezotolerans WP3 Shewanella lyophilized powder with 5L of normal saline with a mass concentration of 0.8% to prepare Shewanellapiezotolerans WP3 bacterial seed liquid with a bacterial concentration of 0.5 mg / mL.

[0057] Black carbon pretreatment: The black carbon is first soaked in HCl solution with a mass concentration of 3.0% for 16 hours, and then washed with deionized water; then soaked with 15g / L NaOH for 16 hours, and washed with deionized water; finally with a mass concentration of 0.8 After soaking in 5% normal saline for 16 hours, place it in a 125°C damp-heat sterilization pot for sterilization for 20 minutes, and dry for use.

[0058] Nano-zero-valent aluminum pretreatm...

Embodiment 3

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

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

[0068] Bacterial seed liquid preparation: Dissolve 5.0 g of Shewanellaoneidensis MR-1 Shewanella lyophilized powder with 5L of normal saline with a mass concentration of 1.0% to prepare Shewanella oneidensis MR-1 bacterial seed liquid with a bacterial concentration of 1.0 mg / mL.

[0069] Black carbon pretreatment: The black carbon is first soaked in HCl solution with a mass concentration of 5.0% for 24h, and then washed with deionized water; then soaked with 20g / L NaOH for 24h, and washed with deionized water; finally with a mass concentration of 1.0 After being soaked in 5% normal saline for 24 hours, it is sterilized in a 120°C humid heat sterilization pot for 30 minutes and dried for later use.

[0070] Nano-zero-valent zinc pretreatment: place 100nm ...

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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 the processes of machinery manufacturing, electronic component cleaning, chemistry, chemical engineering, and agricultural planting. They have "three causes" (carcinogenic, Teratogenic, mutagenic) effects, non-degradability, 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 strong harmfulness of persistent halogenated hydrocarbon pollution, the control and treatment technology of such pollutants has become a research hotspot in the field of environmen...

Claims

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Application Information

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Patent Type & Authority Applications(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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