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Method for repairing hexachlorobenzene contaminated soil through mechanochemistry

A polluted soil, mechanochemical technology, applied in the field of polluted soil remediation

Pending Publication Date: 2021-04-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of the existing mechanochemical method for degrading persistent organic pollutants in soil, the present invention proposes to use natural minerals as the main additive, and the use of auxiliary agents to efficiently decompose persistent organic pollutants represented by hexachlorobenzene in soil , to improve the defects of other additives on soil physical and chemical properties

Method used

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  • Method for repairing hexachlorobenzene contaminated soil through mechanochemistry
  • Method for repairing hexachlorobenzene contaminated soil through mechanochemistry
  • Method for repairing hexachlorobenzene contaminated soil through mechanochemistry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Preparation method, detection and analysis of simulated polluted soil

[0026] 1 Preparation of simulated contaminated soil:

[0027] Grind the naturally air-dried soil (moisture content about 3.5%) and pass through a 100-mesh sieve, place the sieved soil in a brown wide-mouth glass bottle, and dissolve a certain amount of hexachlorobenzene (purity is 99%) In acetone solvent, fully mix the two to prepare 100mg / kg simulated contaminated soil sample 1, and place it in a cool and ventilated place for aging. Three sampling test results can be used within 100±5mg / kg. Configure 10mg / kg simulated polluted soil sample 2 in the same way.

[0028] 2 Analysis and detection of residual hexachlorobenzene in soil:

[0029] Take 1g of soil and place it in a 250ml glass beaker, add 50ml of acetone and n-hexane mixed extractant (the volume ratio of acetone and n-hexane is 1:1), and extract by ultrasonic at 500W ultrasonic frequency for 30min, repeat twice, mix the extract, ...

Embodiment 2

[0034] The influence of embodiment two different additives on the degradative effect of hexachlorobenzene in soil

[0035] In this embodiment, the ball mill used is an omnidirectional planetary ball mill, the ball mill pot and balls are made of zirconia, and the ball ratio (mass ratio) It is 1:1; the material ratio refers to the mass ratio of adding hexachlorobenzene-contaminated soil to the additive; the ball-to-material ratio refers to the mass ratio of the ball mass to the ball milling material (including additives and contaminated soil).

[0036] The specific method for degrading hexachlorobenzene in the soil by the mechanochemical method of the present invention is to use natural mineral powder as an additive to realize the remediation of contaminated soil under the action of mechanical force, so as to reduce the impact on soil properties. Natural mineral powder has rich pore structure and active adsorption reaction sites, such as albite, calcined dolomite, zeolite, sepi...

Embodiment 3

[0041]Natural mineral powder has complex components and many impurities. When it is used as a single additive, the effect is limited, and it needs to be supplemented with a grinding aid with certain reactivity. The combined use of main grinding agent and grinding aid can not only improve the effect, but also reduce the amount of additives and reduce the reaction time. In the case of albite as the main grinding agent, the effects of different grinding aids on the degradation of hexachlorobenzene in soil were explored. The added grinding aids included: montmorillonite, Al 2 o 3 , Fe 3 o 4 , SiO 2 , calcined dolomite, rice husk charcoal, charcoal, bamboo charcoal, soil sample 1 was used as the simulated soil. Set the ball milling process parameters as follows: the ball milling time is 2h, the rotation speed is 550rpm, the ball-to-material ratio is 20:1, the material ratio is 10:1, and the mass ratio of ball milling main agent to auxiliary agent is 5:1. After ball milling, th...

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Abstract

The invention belongs to the technical field of persistent organic pollutant contaminated soil treatment, and particularly relates to a method for repairing hexachlorobenzene contaminated soil through mechanochemistry. The method comprises the following steps: drying and crushing hexachlorobenzene contaminated soil, putting the crushed hexachlorobenzene contaminated soil, natural minerals and an auxiliary agent into a ball-milling tank according to a mass ratio of 5:1 to 10:1, adding milling balls according to a ball-to-material ratio of 10:1 to 30:1, fully conducting mixing for 5 min under the action of the milling balls, and carrying out a mechanochemical reaction under certain ball-milling time and rotating speed conditions. Hexachlorobenzene is finally converted into low-chlorinated benzene series and chloride ions, pollutants which are high in toxicity and easy to migrate are converted into low-toxic benzene series, and harmless treatment of the pollutants is achieved. Natural minerals are rich in reserves and have less influence on soil properties, so that the method truly realizes efficient, green and low-cost remediation of hexachlorobenzene contaminated soil, and is a mechanochemical persistent organic pollutant treatment technology with a wide application prospect.

Description

technical field [0001] The invention relates to a method for realizing mechanical and chemical restoration of hexachlorobenzene-contaminated soil based on natural minerals as main additives, and belongs to the field of contaminated soil restoration. Background technique [0002] Hexachlorobenzene is one of the first twelve persistent organic pollutants to be included in the Stockholm Convention on Persistent Organic Pollutants. It has strong biological toxicity, migration and refractory properties, and it is easy to have persistent effects on sediments and soils, thereby affecting crop safety and human health. [0003] At present, there are many remediation methods for POPs-contaminated soil such as hexachlorobenzene, among which mechanochemical treatment technology is a promising remediation technology. Predecessors have done a lot of research on it, mainly focusing on the selection of ball milling additives. Involves reducing agents, oxidizing agents, solid bases and SiO...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 陈惠超李雪梁潇梁财
Owner SOUTHEAST UNIV
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