Method for removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dechlorination degradation

Patent metadata

Field	Value
Publication number	US-11866352-B2
Application number	US-202318119421-A
Country	US
Kind code	B2
Filing date	Mar 9, 2023
Priority date	Apr 2, 2022
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

The present disclosure discloses a method for removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dechlorination degradation. A double-chamber electrolyzer reactor is used to carry out step-by-step electrocatalytic dechlorination degradation to remove chlorinated hydrocarbons in groundwater. The double-chamber electrolyzer reactor comprises a cathode chamber, a proton exchange membrane, an anode chamber and an intermediate processing unit, wherein the cathode chamber is separated from the anode chamber through the proton exchange membrane, and the intermediate processing unit is connected between the cathode chamber and the anode chamber through a cathode chamber water outlet, an anode chamber water inlet and pipelines. The double-chamber electrolyzer reactor adopted in the present disclosure is simple in structure and convenient to use, is capable of effectively enhancing the removal effect of electric catalysis on chlorinated hydrocarbon substances and reducing toxic and harmful substances produced by direct oxidization of chlorinated hydrocarbons, and has a good application prospect.

First claim

What is claimed is:

1. A method for removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dechlorination degradation, wherein chlorinated hydrocarbons in groundwater is removed by using a double-chamber electrolyzer reactor through step-by-step electrocatalytic dechlorination degradation, the groundwater passes through a cathode chamber water inlet ( 5 ) to enter a cathode chamber ( 1 ) to be dechlorinated, then an effluent is transported into an intermediate processing unit ( 4 ) for acidification adjustment, the effluent after acidification adjustment passes through an anode chamber water inlet ( 8 ) to enter an anode chamber ( 3 ) to be treated and then discharged, the anode chamber ( 3 ) needs to be filled with an electrolyte solution prior to removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dechlorination degradation;
the double-chamber electrolyzer reactor comprises the cathode chamber ( 1 ), a proton exchange membrane ( 2 ), the anode chamber ( 3 ) and the intermediate processing unit ( 4 ),
the cathode chamber ( 1 ) comprises the cathode chamber water inlet ( 5 ) arranged at one side of the cathode chamber ( 1 ), a cathode plate ( 6 ) arranged in the cathode chamber ( 1 ), and a cathode chamber water outlet ( 7 ) arranged at another side of the cathode chamber ( 1 ),
the anode chamber ( 3 ) comprises the anode chamber water inlet ( 8 ) arranged at one side of the anode chamber ( 3 ), an anode plate ( 9 ) arranged in the anode chamber ( 3 ), and an anode chamber water outlet ( 10 ) arranged at another side of the anode chamber ( 3 ),
the cathode chamber ( 1 ) is separated from the anode chamber ( 3 ) through the proton exchange membrane ( 2 ), and the intermediate processing unit ( 4 ) is connected between the cathode chamber ( 1 ) and the anode chamber ( 3 ) through the cathode chamber water outlet ( 7 ), the anode chamber water outlet ( 8 ) and pipelines,
the intermediate processing unit ( 4 ) comprises a processing cabin ( 41 ), and the processing cabin ( 41 ) is divided into a power region located on the upper part inside the processing cabin ( 41 ) and a mixing region located on the lower part inside the processing cabin ( 41 ) through a partition ( 42 ),
the inner top surface of the processing cabin ( 41 ) is provided with a drive cavity ( 43 ) for loading a fan blade ( 44 ), the lower bottom surface of the drive cavity ( 43 ) penetrates through the partition ( 42 ) through a plurality of groups of draft tubes ( 431 ) and is communicated with the mixing region, the fan blade ( 44 ) is arranged inside the drive cavity ( 43 ) in a rotation manner and the fan blade ( 44 ) penetrates through the lower bottom surface of the drive cavity ( 43 ) through a shaft rod ( 441 ) and is clamped with a drug adding assembly,
the drug adding assembly comprises a screw sleeve ( 45 ) clamped with the shaft rod ( 441 ) of the fan blade ( 44 ), the screw sleeve ( 45 ) is in threaded connection with a screw ( 46 ) for downward pressing a drug adding box ( 47 ), one side of the screw ( 46 ) corresponding to the drug adding box ( 47 ) is provided with a press plate ( 461 ), the screw sleeve ( 45 ) and the shaft rod ( 441 ) are matched and clamped with a clamp slot through clamp blocks,
the lower bottom surface of the partition ( 42 ) corresponding to the position of the drug adding box ( 47 ) is provided with a catheter ( 48 ) for drug delivery, the catheter ( 48 ) penetrates through the partition ( 42 ) and is communicated with the outlet of the drug adding box ( 47 ), the upper surface of the partition ( 42 ) corresponding to the position of the press plate ( 461 ) is provided with a plurality of groups of guide rods ( 462 ) that are slidably connected with the press plate ( 461 ) and used for restricting the rotation of the press plate ( 461 ),
the drug adding box ( 47 ) is specifically a sac loaded with diluted hydrochloric acid, one side of the upper surface of the processing cabin ( 41 ) is provided with a liquid inlet ( 411 ), one side of the lower bottom surface of the processing cabin ( 41 ) is provided with a liquid outlet ( 412 ), the processing cabin ( 41 ) located in the mixing region is provided with a horn mouth-shaped spacer ring ( 49 ) for river diversion, the upper part of the horn mouth-shaped spacer ring ( 49 ) is in seal connection with the processing cabin ( 41 ), the lower part of the horn mouth-shaped spacer ring ( 49 ) is provided with an outlet ( 491 ), and the outlet ( 491 ) is staggered with the liquid outlet ( 412 ).

2. The method for removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dechlorination degradation according to claim 1 , wherein both of the cathode plate ( 6 ) and the anode plate ( 9 ) are of a network structure.

3. The method for removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dechlorination degradation according to claim 1 , wherein working conditions for removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dechlorination degradation in the double-chamber electrolyzer reactor are as follows: the voltage is 3-10V, the temperature is 20-30° C., and the retention time is 3-5 h.

4. The method for removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dechlorination degradation according to claim 1 , wherein a solute of an electrolyte solution for removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dechlorination degradation in the double-chamber electrolyzer reactor is NaCl.

5. The method for removing chlorinated hydrocarbons in groundwater through step-by-step electrocatalytic dichlorination degradation according to claim 1 , wherein the material of the a node plate ( 9 ) is a Ti-based ruthenium-iridium electrode, and the material of the cathode plate ( 6 ) is amorphous nickel phosphide.

Assignees

• Nanjing University Of Technology

Inventors

• Xu Ke
• Liu Zhengqing
• Ma Sijia
• Ren Hongqiang

Classifications

• C02F1/4674 Primary

  with halogen or compound of halogens, e.g. chlorine, bromine · CPC title

• C02F1/4676

  by electroreduction · CPC title

• C02F2001/46133

  characterised by the material · CPC title

• C02F2101/363

  PCB's; PCP's · CPC title

• C02F2103/06

  Contaminated groundwater or leachate · CPC title