Method and apparatus for treating high concentrated organic wastewater by hydrothermal electrical catalytic oxidation

A technology of organic wastewater and catalytic oxidation, applied in the direction of oxidized water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as high operating costs, long time, salt blockage, etc., to reduce costs and operating costs , the effect of improving efficiency

Inactive Publication Date: 2005-08-17
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature and pressure required by the wet catalytic oxidation technology (referred to as CWO) are still relatively high, at 7-10MPa, and the reaction temperature is 200-350°C. Therefore, the equipment investment is relatively high, and the operating cost is also relatively expensive.
Supercritical oxidation technology The temperature and pressure of supercritical water require high material requirements, salt blockage, and high operating costs
Other oxidation techniques need to consume chemical oxidants, which take a long time and cannot be completely treated

Method used

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  • Method and apparatus for treating high concentrated organic wastewater by hydrothermal electrical catalytic oxidation
  • Method and apparatus for treating high concentrated organic wastewater by hydrothermal electrical catalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Implementation on the intermittent device:

[0022] 1. Using a batch reactor:

[0023] Reactor 316L stainless steel body 500ml (equipment of prior art);

[0024] Anode: Titanium mesh plated PbO 2 , 2×7mm (or plated with lead dioxide, or antimony trioxide, or tin oxide, or ruthenium oxide or their mixture);

[0025] Catalyst: a catalyst composed of 75% titanium oxide, 20% cerium oxide, 0.5% ruthenium, and 4.5% bismuth oxide (or other existing catalysts);

[0026] Cathode: the reactor itself;

[0027] Voltage: 6V; Current: 5A;

[0028] Electrolyte Na 2 SO 4 5% (accounting for 5% of the wastewater volume);

[0029] COD concentration (initial) 18000ppm 150ml waste water (phenol);

[0030] NH 3 -N concentration (initial) 3000ppm

[0031] o 2 Partial pressure 1MPa (initial) PH adjustment to 10

[0032] Temperature 200°C Reaction time 1 hour

[0033] COD removal rate 90% NH 3 -N 99%

Embodiment 2

[0034] Example 2: Implementation on a continuous device

[0035] The electrolytic reactor is a cylindrical flow device, that is, sewage and oxygen-containing gas enter from the bottom of the reactor, and the treated sewage is continuously discharged after heat exchange and gas-liquid separation, so that sewage treatment can be carried out automatically and continuously.

[0036] in:

[0037] Anode: conductive carbon coated with a layer of tin oxide;

[0038] Catalyst: Ru / Ce-ZrO 2 ;

[0039] Voltage: 6V; Current: 5A;

[0040] Reactor volume 2L, NH 3 N concentration (initial) 3000ppm COD initial concentration 18000ppm (phenol and ammonium sulfate);

[0041] Cathode: the reactor itself;

[0042] The processing results are shown in the table below:

[0043] T 100°C 150°C 180°C 200°C 250°C

[0044] T 100°C 150°C 180°C 200°C

Embodiment 3

[0045] Example 3: Implementation on a continuous device:

[0046]The electrolytic reactor is a cylindrical flow device, that is, sewage and oxygen-containing gas enter from the bottom of the reactor, and the treated sewage is continuously discharged after heat exchange and gas-liquid separation, so that sewage treatment can be carried out automatically and continuously.

[0047] in:

[0048] Anode: Ruthenium oxide is first coated on the titanium rod, and then a layer of lead oxide is coated;

[0049] Cathode: titanium mesh;

[0050] Solid filling material: granular activated carbon (or granular diatomite, or shaped molecular sieve, or titanium oxide, or aluminum oxide, or zirconium oxide, or cordierite, or water-insoluble inorganic materials such as magnesium oxide);

[0051] Voltage: 6V, PO 2 Divided pressure is 2MPa; Current: 10A;

[0052] Wastewater is coking wastewater, COD is 19950PPm, NH 3 -N is 1300PPm;

[0053] Adjust pH ≈ 11, add 5% Na of wastewater 2 SO 4 as ...

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Abstract

The present invention is hydrothermal and electric catalytic oxidation process and apparatus for treating high concentration organic waste water. The present invention features that high concentration organic waste water is treated electrolytically at temperature from room temperature to 250 deg.c and pressure of 0.5-7 MPa while oxygen containing air is led in to eliminate organic compound and nitrous compound from waste water and to make them become CO2, N2, water or inorganic salt inside an intermittent or continuous electrolytic reactor. The present invention combines wet catalytic oxidation and high temperature electrolysis, and has relatively low reaction temperature and pressure, high organic waste water treating efficiency and low cost.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method and a device for treating high-concentration organic wastewater by hydrothermal electrocatalytic oxidation. technical background [0002] As a kind of pollutant, high-concentration organic wastewater has the characteristics of high toxicity and refractory biodegradation. The current method generally adopts biochemical treatment after dilution. For special high-concentration organic wastewater, methods such as distillation, adsorption, and incineration are also used to treat it. Using the existing electrolysis technology to treat wastewater is characterized by adding a certain amount of electrolyte under normal pressure to decompose organic compounds. Its defect is that it is only for medium and low concentration organic wastewater, which takes a long time of 4-24 hours and consumes a lot of electricity. Recently, some advanced physical and chemical methods are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J32/00C02F1/02C02F1/461C02F1/72
Inventor 涂学炎张世鸿王伟李自弘
Owner YUNNAN UNIV
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