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Method for Removing Chlorinated Alkenes from Water by In Situ Chemical Oxidation

A technology for in-situ chemical oxidation and chlorination of olefins, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc. , good emulsification effect

Inactive Publication Date: 2015-08-12
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the remaining oxidant degrades the organic acids injected into the subsurface, complete removal of MnO 2 The amount of organic acid required for precipitation is large, so the amount of organic acid required for each oxidation rinse is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for removing chlorinated olefins in water by in-situ chemical oxidation, comprising the following steps:

[0026] (1) Use a 43.2mL screw-top brown bottle as the reaction bottle, line the bottle cap with a polytetrafluoroethylene / silica gel septum, first add 20mL of ultrapure water to the reaction bottle, and then add 0.432mL of 10g / L Sodium hexametaphosphate and 4.32mL 10g / L sodium dodecylsulfonate, then add 1mL 2063mg / L potassium permanganate solution for oxidation reaction.

[0027] (2) Add a certain amount of trichlorethylene (TCE) solution to the reaction flask in step (1) so that the concentration of TCE is 20mg / L, and then fill the reaction flask with ultrapure water.

[0028] (3) Place the reaction bottle of step (2) in a plexiglass drum with a diameter of 140mm and a length of 330mm, and carry out the reaction in a constant temperature incubator (SPX-250B-Z type constant temperature incubator), and control the reaction temperature at 20°C , the rotatin...

Embodiment 2

[0034] A method for removing chlorinated olefins in water by in-situ chemical oxidation, comprising the following steps:

[0035] (1) Use a 43.2mL screw-top brown bottle as the reaction bottle, line the bottle cap with a polytetrafluoroethylene / silica gel septum, and first add 20mL of actual groundwater (taken from the groundwater of a well in Qingpu District, Shanghai) to the reaction bottle , then sequentially add 0.432mL 10g / L sodium hexametaphosphate and 4.32mL 10g / L sodium dodecylsulfonate, and then add 1mL 2063mg / L potassium permanganate solution for oxidation reaction.

[0036] (2) Add a certain amount of trichlorethylene (TCE) solution to the reaction bottle in step (1), so that the concentration of TCE is 20mg / L, and then fill the reaction bottle with groundwater.

[0037] (3) Place the reaction bottle of step (2) in a plexiglass drum with a diameter of 140mm and a length of 330mm, and carry out the reaction in a constant temperature incubator (SPX-250B-Z type constan...

Embodiment 3

[0043] A method for removing chlorinated olefins in water by in-situ chemical oxidation, comprising the following steps:

[0044] (1) Use a 24.5mL screw-top brown bottle as the reaction bottle, and line the bottle cap with a polytetrafluoroethylene / silica gel septum. First add 5mL of ultrapure water to the reaction bottle, and then add 1.225mL of 2g / L Sodium hexametaphosphate and 4.86mL 5g / L sodium dodecylsulfonate, then add 8.67mL 800mg / L potassium permanganate solution for oxidation reaction.

[0045] (2) Add a certain amount of tetrachlorethylene (PCE) solution to the reaction bottle in step (1) so that the concentration of PCE is 20mg / L, and then fill the reaction bottle with ultrapure water.

[0046] (3) Place the reaction bottle of step (2) in a plexiglass drum with a diameter of 140mm and a length of 330mm, and carry out the reaction in a constant temperature incubator (SPX-250B-Z type constant temperature incubator), and control the reaction temperature at 20°C , the ...

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Abstract

The invention relates to a method for removing chloro-olefin in water through in-situ chemical oxidation, which comprises the following steps: (1) firstly, adding water in a reaction flask, then adding sodium hexametaphosphate with mass fraction of 0.01% and sodium dodecyl sulfate with mass fraction of 0.1%, and finally adding a potassium permanganate solution having a fixed molar ratio with chloro-olefin; (2) adding a 20 mg / L TCE or PCE solution into the reaction flask in the step (1) and then filling up the reaction flask with water, wherein the molar ratio of the TCE to the potassium permanganate solution is 2:1, and the molar ratio of the PCE to the potassium permanganate solution is 15:1; (3) putting the reaction flask obtained in the step (2) in a roller and reacting in an incubator at constant temperature to obtained treated water, wherein the reaction temperature is 20 DEG C, and the rotation speed of the roller is 7r / min. According to the invention, underground water polluted by TCE and PCE is treated by the adoption of the potassium permanganate solution, and the participation of sodium hexametaphosphate and a surfactant, the method is simple and feasible, the cost is low, the final dechlorination efficiency of TCE is increased by more than 19.5%, and the final dechlorination efficiency of PCE is increased by more than 7.5%.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for removing chlorinated olefins in water through in-situ chemical oxidation. Background technique [0002] Chlorinated compounds, including carbon tetrachloride, chloroform, trichloroethylene (TCE) and tetrachloroethylene (tetrachloroethylene, PCE), 1,1,1-trichloroethane, etc., are currently widely used in industry Solvents, metal degreasers, clothing dry cleaning agents. These chlorinated compounds enter the groundwater through the soil through volatilization, leakage, wastewater discharge, etc., and become typical organic pollutants in groundwater. Investigations at home and abroad have shown that TCE and PCE, two chlorinated olefins, are chlorinated compounds with a high detection rate in groundwater pollution. The chlorinated olefins exist in soil and groundwater in the form of dense non-aqueous phase liquids (DNAPLs), causing long-term pollution to soil a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/58C02F101/36
Inventor 邱兆富杨维维窦颖逯志昌刘腾刘健吕树光隋倩
Owner EAST CHINA UNIV OF SCI & TECH
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