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Method for oxidizing tetrachloroethylene pollutants in household garbage room by chlorine-containing oxidant

A technology for domestic waste and tetrachloroethylene, applied in the field of domestic waste pollutant treatment, can solve the problems of poor removal effect of tetrachloroethylene, increased VOCs concentration, weak ozone stability, etc., to limit phototoxic side effects and achieve unmanned Operation, no secondary pollution effect

Pending Publication Date: 2021-09-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the weak stability of ozone, it is easy to undergo self-decomposition reaction, which leads to a decrease in oxidation, and when the ozone is excessive, a secondary reaction will occur, resulting in an increase in the concentration of VOCs, and the removal effect on tetrachlorethylene is very poor.

Method used

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  • Method for oxidizing tetrachloroethylene pollutants in household garbage room by chlorine-containing oxidant

Examples

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Effect test

Embodiment 1

[0030] A method for chlorine-containing oxidizing agent to oxidize tetrachlorethylene pollutants in domestic garbage houses:

[0031] A slightly acidic electrolyzed water generator (voltage 24V; current 2.5A) is equipped in a household garbage room in a community in Shanghai, and 8 nozzles (diameter 150mm; spray rate 1.6) are evenly distributed on the top along the length of the household garbage room. mL / min).

[0032] 9% dilute hydrochloric acid is electrolyzed in a diaphragmless electrolytic cell of a slightly acidic electrolyzed water generator to generate slightly acidic electrolyzed water with a pH of 5.0-6.5 and an available chlorine content of 50-100 mg / L.

[0033] The slightly acidic electrolyzed water generator is connected to a high-pressure nozzle sprayer (pressure 6.0MPa; maximum flow rate 1.6L / min). The slightly acidic electrolyzed water generated by the slightly acidic electrolyzed water generator is atomized by a high-pressure nozzle sprayer, and then vertical...

Embodiment 2

[0036] A method for oxidizing tetrachlorethylene pollutants in a household garbage room with a chlorine-containing oxidant, the method comprising: installing a slightly acidic electrolyzed water generator in the household garbage room, electrolyzing low-concentration dilute hydrochloric acid to generate hypochlorous acid as the main oxidizing component The slightly acidic electrolyzed water is then atomized and sprayed in the domestic garbage room to oxidize the tetrachlorethylene pollutants in the domestic garbage room.

[0037] Among them, the voltage of the slightly acidic electrolyzed water generator is 12V, and the current is 2A. In low-concentration dilute hydrochloric acid, the mass fraction of HCl is 9%. The pH value of slightly acidic electrolyzed water is 6.0, and the available chlorine content is 70mg / L.

[0038]The domestic garbage room is equipped with a high-pressure nozzle sprayer, and the obtained slightly acidic electrolyzed water is atomized through the high...

Embodiment 3

[0041] A method for oxidizing tetrachlorethylene pollutants in a household garbage room with a chlorine-containing oxidant, the method comprising: installing a slightly acidic electrolyzed water generator in the household garbage room, electrolyzing low-concentration dilute hydrochloric acid to generate hypochlorous acid as the main oxidizing component The slightly acidic electrolyzed water is then atomized and sprayed in the domestic garbage room to oxidize the tetrachlorethylene pollutants in the domestic garbage room.

[0042] Among them, the voltage of the slightly acidic electrolyzed water generator is 36V, and the current is 3A. In low-concentration dilute hydrochloric acid, the mass fraction of HCl is 10%. The pH value of slightly acidic electrolyzed water is 5.0, and the available chlorine content is 100mg / L.

[0043] The domestic garbage room is equipped with a high-pressure nozzle sprayer, and the obtained slightly acidic electrolyzed water is atomized through the h...

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Abstract

The invention relates to a method for oxidizing tetrachloroethylene pollutants in a household garbage room by using a chlorine-containing oxidant. The method comprises the following steps of: arranging a subacid electrolyzed water generator in a household garbage room, electrolyzing low-concentration diluted hydrochloric acid to generate subacid electrolyzed water taking hypochlorous acid as a main oxidation component, atomizing the obtained subacid electrolyzed water, and spraying the atomized subacid electrolyzed water into the household garbage room so as to oxidize tetrachloroethylene pollutants in the household garbage room. Compared with the prior art, in-situ production of the tetrachloroethylene pollutants oxidized by the subacid electrolyzed water is achieved, the concentration of the tetrachloroethylene in the household garbage room is reduced to 120 micrograms / m < 3 > or below, the peculiar smell in the household garbage room is remarkably reduced, the process is simple, and large-scale popularization can be achieved.

Description

technical field [0001] The invention belongs to the technical field of domestic garbage pollutant treatment, and relates to a method for oxidizing tetrachlorethylene pollutants in domestic garbage rooms with chlorine-containing oxidants. Background technique [0002] The domestic garbage room is the initial storage place for domestic garbage. With the implementation of the domestic waste classification policy, the number of domestic waste rooms has continued to increase. The organic matter and water content of municipal solid waste in my country are relatively high, and the waste will spontaneously degrade during the waste storage process to produce a large amount of malodorous gas. VOCs are the main source of malodorous gases, including sulfur compounds, halogenated compounds, aromatic hydrocarbons and hydrocarbons. Among them, a relatively high proportion of tetrachlorethylene is found in waste storage places such as landfills and transfer stations. Perchlorethylene is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/70B01D53/79B01D53/44
CPCB01D53/70B01D53/79B01D53/44B01D2251/108B01D2257/2064Y02B10/50
Inventor 赵由才郭燕燕周涛朱子晗
Owner TONGJI UNIV
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