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Wastewater treatment method and device combining electrochemical degradation and photocatalysis oxidation technologies

A technology for photocatalytic oxidation and wastewater treatment, which can be used in oxidized water/sewage treatment, chemical instruments and methods, light water/sewage treatment, etc. The effect of efficiency

Inactive Publication Date: 2009-10-14
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the electrochemical method also has its limitations: the initial stage of electrochemical degradation of high-concentration organic pollutants will have a relatively high current efficiency, but as the treatment time prolongs and the concentration of organic pollutants decreases, the electrochemical process turns into a diffusion-dependent process. step limit, the current efficiency will drop significantly, resulting in high energy consumption and time-consuming deep degradation of organic matter
[0006] Photocatalytic technology also has its limitations: the main problem of photocatalytic application in wastewater treatment is the immobilization of photocatalysts and the characteristics of surface reactions, which determine that photocatalytic oxidation technology is more suitable for the degradation of low-concentration organic pollutants

Method used

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  • Wastewater treatment method and device combining electrochemical degradation and photocatalysis oxidation technologies
  • Wastewater treatment method and device combining electrochemical degradation and photocatalysis oxidation technologies
  • Wastewater treatment method and device combining electrochemical degradation and photocatalysis oxidation technologies

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Embodiment 1

[0044] Such as figure 1 As shown, the device for wastewater treatment combined with electrochemical degradation and photocatalytic oxidation technology includes a liquid storage tank 1, a centrifugal pump 2, a constant temperature component 3, an anode 4, a cathode 5, a constant current power supply 6 and a photocatalytic reactor 7 .

[0045] The liquid storage tank 1 is connected to the liquid inlet of the centrifugal pump 2 through a pipe, the liquid outlet of the centrifugal pump 2 is connected to the liquid inlet of the thermostat 3 through a pipe, and the liquid outlet of the thermostat 3 is connected to a pipe with high boron-doped The diamond film electrode is the anode 4, and the stainless steel electrode is connected to the flow electrolytic cell composed of the cathode 5. The liquid outlet of the flow electrolytic cell is connected to the liquid inlet of the tubular ring-shaped photocatalytic reactor 7 through a pipeline. There is a double-layer quartz sleeve with w...

Embodiment 2

[0049] The device is the same as that in Example 1, and the TiO is loaded with foamed nickel mesh 2 As a supported photocatalyst, the effects of three different processes on the treatment of methylene blue dye wastewater were investigated: electrochemical method, photocatalytic method, and electrochemical and photocatalytic combination. When 500ml concentration is 0.05mmol / l methylene blue dye wastewater is processed, when adopting BDD electrode as anode (boron atomic density is: 10 18 20 cm -3 ), the current density is 50mA / cm 2 , supporting electrolyte 0.1mol / l Na 2 SO 4 Under the conditions, a separate electrochemical degradation method is carried out, and the decolorization rate of methylene blue dye wastewater is 55.36% after 20 minutes of electrochemical degradation. When nickel foam is used to load TiO 2 For photocatalyst (nickel foam carrier area: 280cm 2 , the load is: 5.5mg / cm 2 ), when the 18W low-pressure mercury lamp was used as a light source for separate ...

Embodiment 3

[0051] Device is the same as embodiment 1, adopts BDD electrode as anode (boron atom density is: 10 18 20 cm -3 ), at a current density of 50mA / cm 2 , supporting electrolyte 0.1mol / l Na 2 SO 4 Under the conditions, 500ml of methylene blue dye wastewater with a concentration of 0.1mmol / l was first treated electrochemically for 40 minutes, and then photocatalytic process was used for degradation. The photocatalyst was 0.5g / L P25 powder dispersed photocatalyst. After electrochemical degradation for 40 minutes, the decolorization rate of methylene blue was 31.73%, and then photocatalytic degradation was continued for 150 minutes, and the decolorization rate of methylene blue reached 93.86%. The decolorization effect of methylene blue in the experiment is shown in Figure 4 .

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Abstract

The invention relates to a wastewater treatment method and device combining electrochemical degradation and photocatalysis oxidation technologies taking a diamond film electrode as the anode. The device comprises a flowing electrolytic bath and a photocatalytic reactor. Contaminants have electrocatalytic oxidation at the anode of the flowing electrolytic bath and are electrolyzed to separate out water and then enter the photocatalytic reactor for further degradation. The combination of two technologies can improve the current efficiency reduction caused by oxygen analyzing reaction in an electrochemistry part because oxygen analyzed by the electrochemistry part is a favorable trapping agent of photoelectrons of a photocatalysis part, can improve the separation efficiency of the photoelectrons and cavities and improve the catalytic degradation of the photocatalysis part. Meanwhile, by opening or closing various parts of the device, proper operational modes can be selected according to the kinds and the concentration of wastewater, such as an independent electrochemistry method, an independent photocatalysis method, an electrochemistry and photocatalysis combined method and other different operational modes.

Description

technical field [0001] The invention belongs to the technical fields of environmental chemical industry and photoelectric catalysis water treatment, and relates to a waste water treatment process, in particular to a waste water treatment method and device for combining electrochemical degradation with a diamond film electrode as an anode and photocatalytic oxidation technology. Background technique [0002] With the rapid development of petrochemical, pharmaceutical, pesticide and fuel industries, the number and types of refractory organic pollutants in industrial wastewater are increasing day by day. In particular, it contains a high concentration of aromatic compounds, such as phenols, which belong to the "three causes" substances, are very toxic, and are difficult to be directly removed by general biodegradation methods. Research on electrochemical oxidation technology is very active in this field. This technology refers to the generation of hydroxyl radicals (HO·) on th...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/461C02F1/30C02F1/72
Inventor 只金芳王金良
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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