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A method and application of polychlorinated biphenyl removal and Tween-80 recovery in soil elution waste liquid

A technology for polychlorinated biphenyls and waste liquid, applied in the field of soil pollution remediation, can solve the problems of the influence of the removal rate of polychlorinated biphenyls, less research on treatment and recovery, loss of Tween-80, etc., and achieve great economic benefits and environmental protection. Benefit, less amount of raw materials, reducing the effect of adsorption

Active Publication Date: 2016-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the adsorption performance of powdered activated carbon is good, the selectivity is not strong, and there is strong adsorption to Tween-80 that is micellar state in the liquid phase, but the polychlorinated biphenyl system contained in the waste liquid after rinsing will It has a certain impact on the reuse of Tween-80, so when removing PCBs, it often causes the loss of Tween-80, thereby reducing its reuse rate
At the same time, polychlorinated biphenyls are insoluble in water. After the micelles are destroyed, theoretically, the destruction of the micelles is conducive to further promoting its adsorption by powdered activated carbon. impact, which may have a certain impact on the removal rate of PCBs
At present, there are few domestic studies on the overall treatment and recovery of soil eluents containing PCBs

Method used

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  • A method and application of polychlorinated biphenyl removal and Tween-80 recovery in soil elution waste liquid
  • A method and application of polychlorinated biphenyl removal and Tween-80 recovery in soil elution waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Add soil to the soil elution waste liquid containing PCB (Aroclor 1254) and Tween-80 (TW-80) (the concentration of PCB is 12mg / L, and the concentration of Tween-80 is 20g / L) Elute the acetone with 2% volume of the waste liquid, mix well, let it stand, then add 2g / L powdered activated carbon (200 mesh) to elute the waste liquid for oscillating adsorption for 4h, centrifuge to take the supernatant, and use DSQ II single quadrupole gas phase The concentration of Aroclor1254 in the supernatant was measured by chromatography-mass spectrometry, and the removal rate was calculated. Two parallels were set up in each group, and the blank control was replaced by the same volume of distilled water; the concentration of TW-80 in the supernatant was determined by the following method: precision measurement Take 0.1mL of the supernatant, put it in a 10mL measuring bottle, add double distilled water to make it up to 2.0mL, accurately add 3.0mL of cobalt ammonium thiocyanate test soluti...

Embodiment 2

[0026] Add soil to the soil elution waste liquid containing PCB (Aroclor 1254) and Tween-80 (TW-80) (the concentration of PCB is 12mg / L, and the concentration of Tween-80 is 20g / L) Elute dimethylformamide with 2% volume of the waste liquid, mix well, let stand, then add 2 g / L powdered activated carbon (200 mesh) to elute the waste liquid for oscillating adsorption for 4 hours, centrifuge to get the supernatant, and use DSQ II single Quadrupole gas chromatography-mass spectrometry was used to measure the concentration of Aroclor 1254 in the supernatant, and the removal rate was calculated. Two parallels were set up in each group, and the blank control was replaced by the same volume of distilled water; the TW-80 in the supernatant was determined by the following method Concentration: Accurately measure 0.1mL of the supernatant, put it in a 10mL measuring bottle, add double distilled water to make up to 2.0mL, accurately add 3.0mL of cobalt ammonium thiocyanate test solution, sha...

Embodiment 3

[0028]Add soil to the soil elution waste liquid containing PCB (Aroclor 1254) and Tween-80 (TW-80) (the concentration of PCB is 12mg / L, and the concentration of Tween-80 is 20g / L) Elute dimethylacetamide with 2% volume of the waste liquid, mix well, let stand, then add 2 g / L powdered activated carbon (200 mesh) to elute the waste liquid for oscillating adsorption for 4 hours, centrifuge to get the supernatant, and use DSQ II single Quadrupole gas chromatography-mass spectrometry was used to measure the concentration of Aroclor 1254 in the supernatant, and the removal rate was calculated. Two parallels were set up in each group, and the blank control was replaced by the same volume of distilled water; the TW-80 in the supernatant was determined by the following method Concentration: Accurately measure 0.1mL of the supernatant, put it in a 10mL measuring bottle, add double distilled water to make up to 2.0mL, accurately add 3.0mL of cobalt ammonium thiocyanate test solution, shak...

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Abstract

The invention belongs to the field of soil pollution restoration, and discloses a method of removing polychlorinated biphenyl and recovering tween-80 from a waste soil eluent and application of the method. The method comprises the following operating steps: adding an organic solvent into the waste soil eluent containing polychlorinated biphenyl and tween-80, uniformly mixing the organic solvent with the waste soil eluent, standing, adding powdered activated carbon to the mixture, performing vibrating adsorption, and at last separating out the powdered activated carbon to obtain the eluent from which polychlorinated biphenyl is removed and the tween-80 is recovered. According to the method disclosed by the invention, the organic solvent is added for destroying the tween-80 micelles coating polychlorinated biphenyl, so that the recovery rate of the tween-80 is obviously increased, and meanwhile the higher polychlorinated biphenyl removal rate is achieved; the method is used for eluting polychlorinated biphenyl from soil, can obviously reduce consumption of the tween-80 in the eluent, and is remarkable in economic benefit and benefit of environmental protection.

Description

technical field [0001] The invention belongs to the field of soil pollution restoration, and in particular relates to a method and application for removing polychlorinated biphenyls and recovering Tween-80 in soil elution waste liquid. Background technique [0002] The generation of e-waste in my country is increasing year by year, and the soil pollution is becoming more and more serious, which has become an important environmental problem. The content of toxic organic substances in the soil of some major e-waste dismantling areas is much higher than that in the control area. The pollution survey data shows that in Qingyuan, Guangdong , Guiyu and other electronic waste dismantling sites, the concentration of PCBs in the soil of the contaminated site is as high as 3.34-458mg / kg, far exceeding the normal background value (0.42mg / kg). Many scholars have studied the use of various leaching agents to elute heavy metals and organic pollutants in the soil to reduce soil pollution. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28B09C1/02C02F101/36
Inventor 卢桂宁邓冰露周兴求党志郭楚玲杨琛
Owner SOUTH CHINA UNIV OF TECH