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
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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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