Device and method for producing methane by coupling printing and dyeing wastewater treatment with three-dimensional electrode

A technology of printing and dyeing wastewater and three-dimensional electrodes, which is applied in electrolytic organic production, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of low quantum efficiency and low utilization rate of photogenerated electrons, etc., to avoid waste and save costs , fully dissolved effect

Inactive Publication Date: 2021-02-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, photocatalytic technology is known as the cleanest technology and is widely used in CO 2 Catalytic reduction, but it is difficult to realize industrialization due to its low utilization rate of photogenerated electrons and low quantum efficiency
Thermochemical reduction is the conversion of CO 2 Synthesis of methane with CO and hydrogen under the catalysis of a catalyst can solve environmental and energy problems very well, but generally requires tens of atmospheric pressure and high temperature of several hundred degrees, and the current technology still has bottlenecks

Method used

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  • Device and method for producing methane by coupling printing and dyeing wastewater treatment with three-dimensional electrode
  • Device and method for producing methane by coupling printing and dyeing wastewater treatment with three-dimensional electrode
  • Device and method for producing methane by coupling printing and dyeing wastewater treatment with three-dimensional electrode

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Experimental program
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Effect test

Embodiment 1

[0034] Electrolyte generation tank and electrolyzer cathode compartment are pre-filled with Na 2 CO 3 Solution, the concentration is 10g / L, the solution volume in the electrolyte generation tank is 100mL, and the solution volume in the cathode chamber of the electrolytic cell is 250mL; the initial concentration of rhodamine B wastewater added in the anode chamber of the electrolyzer is changed to 100 and 150mg / L, and the volume is 250mL , pH=7. CO before electrolysis 2 The storage tank feeds CO into the electrolyte generation tank at a constant flow rate of 0.05L / min 2 Gas for 20 minutes until the pH of the liquid in the electrolyte generating tank reaches 6.8. With a current density of 50mA / cm 2 After electrolysis for 30 minutes, the removal rate and amount of TOC in the anode chamber, the amount of methane produced and the Faradaic efficiency of the anode and cathode chambers were calculated.

[0035]

Embodiment 2

[0037] Electrolyte generation tank and electrolyzer cathode compartment are pre-filled with Na 2 CO 3 Solution, the concentration is 10g / L, the solution volume in the electrolyte generation tank is 100mL, and the solution volume in the cathode chamber of the electrolytic cell is 250mL; the initial concentration of rhodamine B wastewater added in the anode chamber of the electrolyzer is changed to 100 and 150mg / L, and the volume is 250mL , pH=7. CO before electrolysis 2 The storage tank feeds CO into the electrolyte generation tank at a constant flow rate of 0.05L / min 2 Gas for 20 minutes until the pH of the liquid in the electrolyte generating tank reaches 6.8. With a current density of 50mA / cm 2 Electrolyze for 60 minutes, during the process of electrolysis, CO is still fed into the electrolyte generating tank at a constant flow rate of 0.05L / min 2 Gas, calculate the removal rate and amount of TOC in the anode chamber, the amount of methane produced and the Faradaic effi...

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Abstract

The invention provides a device and method for producing methane by coupling printing and dyeing wastewater treated by a three-dimensional electrode, and belongs to the technical field of comprehensive utilization of wastewater. The device comprises a CO2 storage tank, an electrolyte generating tank, an electrolytic bath, activated carbon particles, a cathode electrode plate, an anode electrode plate, a direct-current stabilized power supply, a cation exchange membrane, a cathode product gas collecting device and an anode product gas collecting device. The cation exchange membrane is fixed between the two electrode plates and divides the internal space of the electrolytic cell into two electrode chambers, the electrolyte generating tank is connected with a cathode chamber of the electrolytic cell through two pipes to form electrolyte circulation, and the upper parts of the cathode and anode chambers are respectively communicated with respective product gas collecting devices through conduits. According to the device, carbon dioxide can be reduced by the cathode to generate methane while printing and dyeing wastewater is treated by the anode, gas products in the two chambers can becompletely separated by the ion exchange membrane, methane collection of the cathode is facilitated, and the aims of treatment of degradation-resistant wastewater and emission reduction of carbon dioxide are fulfilled.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of wastewater, in particular to a device and method for three-dimensional electrode treatment of printing and dyeing wastewater coupled with methane production. Background technique [0002] The output of printing and dyeing wastewater in my country is huge, with an annual discharge of more than 2 billion tons. The pH of the wastewater is between 10-11, and the content of organic matter is high, including rhodamine B, malachite green, methylene blue, acid scarlet and other macromolecular organic compounds containing benzene and naphthalene. COD is about 800-2000mg / L, and about 10% of the unsuccessful coloring dyes remain in the wastewater, so it has the characteristics of high concentration, many types, high alkalinity, high toxicity and high chroma, and belongs to the type of industrial wastewater that is difficult to treat. . At present, the methods used for printing and dyeing ...

Claims

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Application Information

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IPC IPC(8): C02F1/461C25B3/26C25B3/03C25B15/08C25B9/19C02F101/30
CPCC02F1/46104C02F2101/308C02F2201/46115C02F2201/46185C02F2201/4619C25B15/08
Inventor 汪群慧徐元晟倪金史慧敏高明
Owner UNIV OF SCI & TECH BEIJING
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