Slow-release composite repairing reagent for treating persistant halohydrocarbons in soil and preparation method of same

A composite remediation and persistent technology, applied in the field of contaminated soil remediation, can solve the problems of persistent halogenated hydrocarbon pollution, secondary environmental pollution, poor removal effect, etc., and achieves high chemical reduction dechlorination degradation efficiency, low cost, The effect of structural stabilization

Active Publication Date: 2018-10-23
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES +2
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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 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 stabi

Method used

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  • Slow-release composite repairing reagent for treating persistant halohydrocarbons in soil and preparation method of same
  • Slow-release composite repairing reagent for treating persistant halohydrocarbons in soil and preparation method of same
  • Slow-release composite repairing reagent for treating persistant halohydrocarbons in soil and preparation method of same

Examples

Experimental program
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Embodiment 1

[0043] A method for preparing a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in soil, the steps are as follows:

[0044] (1) Preparation of bacterial seed liquid and pretreatment of raw materials

[0045] 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.

[0046] 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.

[0047] Pretreatment of nano-zero-valent iron: put 10nm zero-valent iron powder in HCl solution with ...

Embodiment 2

[0055] A method for preparing a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in soil, the steps are as follows:

[0056] (1) Preparation of bacterial seed liquid and pretreatment of raw materials

[0057] 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.

[0058] 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.

[0059] Nano-zero-valent aluminum pretreatment: put 50nm nano-zero-valent aluminum powder in HCl solution with a m...

Embodiment 3

[0067] A method for preparing a slow-release composite restoration agent for treating persistent halogenated hydrocarbons in soil, the steps are as follows:

[0068] (1) Preparation of bacterial seed liquid and pretreatment of raw materials

[0069] 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.

[0070] 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.

[0071] Pretreatment of nano-zero-valent zinc: place 100nm nano-zero-valent zinc powder in HCl solution with a mass co...

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Abstract

The invention discloses a slow-release composite repairing reagent for treating persistant halohydrocarbons in soil and a preparation method of same. The preparation method includes steps of: 1) preparing microbial liquid saturated black charcoal; 2) preparing a colloidal solution A containing locust bean gum and an organic carbon source; 3) preparing a colloidal turbid liquid B containing the locust bean gum, organic carbon source, nano zero-valent metal, and the microbial liquid saturated black charcoal; 4) performing a crosslinking reaction for 2-6 h; 5) performing a delayed crosslinking reaction for 2-6 h to obtain the slow-release composite repairing reagent. By means of excellent adsorption performance of the black charcoal, high-effective chemical reduction effect of the nano zero-valent metal and dissimilatory iron reduction dehalogenation capability of functional microorganisms, the repairing reagent can achieve physical-chemical-biological synergistic reinforced repairing effect to the soil polluted by the persistant halohydrocarbons, and has advantages of long action period, stable structure, low cost and environment-friendly property.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and relates to a contaminated soil remediation agent and a preparation method thereof, in particular to a slow-release composite remediation agent for treating persistent halogenated hydrocarbons in soil 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 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 r...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08B09C1/10A01B79/00
CPCA01B79/00B09C1/08B09C1/10B09C2101/00C09K17/40
Inventor 孟梁汪华林吉昌铃杨洁张施阳
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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