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Ozone, electrochemistry and Fenton oxidation coupled combination deep treatment system and treatment process

A technology of Fenton oxidation and ozone oxidation, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can save equipment investment and strengthen the oxidation and removal effect of organic matter.

Inactive Publication Date: 2018-01-30
BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple ozone oxidation is selective, and it has a good treatment effect on some unsaturated organic compounds and aromatic compounds, but it is difficult to completely mineralize the organic matter, and at the same time, it has a poor treatment effect on some organic compounds such as small molecular fatty acids; the peroxidation added by Fenton oxidation technology The cost of hydrogen is high and the storage and transportation of hydrogen peroxide is highly dangerous
Ozone oxidation generally uses an oxygen source to obtain a higher ozone concentration. Because ozone is difficult to completely react, there is still a certain concentration of ozone in the tail gas after treatment. If it is directly discharged into the atmosphere, it will cause air pollution. In industry, tail gas destruction is generally used for treatment. , on the one hand, the processing cost is higher, on the other hand, oxygen and ozone resources are wasted

Method used

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  • Ozone, electrochemistry and Fenton oxidation coupled combination deep treatment system and treatment process

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Experimental program
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Effect test

Embodiment 1

[0036] The COD of wastewater after biochemical treatment in a coal chemical plant is 300mg / L. It first enters the ozone oxidation unit, the residence time is 15min, and the dosage of ozone is 200mg / L. After ozone oxidation, the wastewater enters the pH adjustment unit to adjust the pH to 3. Sulfuric acid The amount of ferrous iron added is 300mg / L, and then enters the electrochemical / Fenton oxidation unit, the anode uses titanium-based titanium dioxide plate, the cathode uses graphite felt, the electrolysis voltage is controlled at 4V, the effluent enters the pH adjustment unit, and the pH is adjusted to 7-8 for flocculation Precipitate, and finally get the effluent COD50-100mg / L, and the ozone concentration in the exhaust gas of the electrochemical / Fenton oxidation unit is less than 1ppm.

Embodiment 2

[0038] The COD of wastewater after biochemical treatment in a coking plant is 200mg / L. It first enters the ozone oxidation unit, the residence time is 15min, and the dosage of ozone is 150mg / L. After ozone oxidation, the wastewater enters the pH adjustment unit to adjust the pH to 3. Sulfuric acid The amount of ferrous iron added is 200mg / L, and then enters the electrochemical / Fenton oxidation unit, the anode uses titanium-based titanium dioxide plate, the cathode uses activated carbon fiber, the electrolysis voltage is controlled at 2V, the effluent enters the pH adjustment unit, and the pH is adjusted to 7-8 for flocculation Precipitate, and finally get the effluent COD 40-60mg / L, and the ozone concentration in the exhaust gas of the electrochemical / Fenton oxidation unit is less than 1ppm.

Embodiment 3

[0040]The COD of wastewater after biochemical treatment in a paper mill is 300mg / L. First, it enters the ozone oxidation unit, the residence time is 20min, and the dosage of ozone is 300mg / L. After ozone oxidation, the wastewater enters the pH adjustment unit to adjust the pH to 3. The amount of ferrous iron added is 400mg / L, and then enters the electrochemical / Fenton oxidation unit. The anode uses titanium-based ruthenium dioxide, and the cathode uses a powder electrode bonded and pressed by carbon nanotubes and polytetrafluoroethylene emulsion to control the electrolysis voltage. 7V, the effluent enters the pH adjustment unit, adjusts the pH to 7-8 for flocculation and precipitation, and finally obtains the effluent COD lower than 50mg / L, and the ozone concentration in the tail gas discharged from the electrochemical / Fenton oxidation unit is less than 1ppm.

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Abstract

The invention discloses an ozone, electrochemistry and Fenton oxidation coupled combination deep treatment system and a treatment process. The system comprises an ozone oxidation unit and an electrochemistry / Fenton oxidation unit, wherein a first pH adjusting unit is arranged at the rear end of the ozone oxidation unit and is connected with the electrochemistry / Fenton oxidation unit; a second pH adjusting unit is arranged at the rear end of the electrochemistry / Fenton oxidation unit; the ozone oxidation unit is connected with the electrochemistry / Fenton oxidation unit; ozone oxidation tail gasis introduced into the electrochemistry / Fenton oxidation unit. Wastewater treated by the treatment system and the treatment process disclosed by the invention is discharged after COD (Chemical OxygenDemand) in the wastewater reaches standards; the concentration of ozone in tail gas is smaller than 1ppm, and the oxidation removing effect of organic matters is sufficiently enhanced; the tail gas is oxidized by using the ozone, and a cathode undergoes reduction reaction in electrode reaction to generate hydrogen peroxide; the hydrogen peroxide and added ferrous ions form a Fenton reagent; meanwhile, an anode undergoes oxidation reaction of the organic matters, and deep removal of the organic matters is realized; a tail gas damaging device which is commonly used in the industry is omitted, so that the investment of the device is saved; recycling of waste gases is realized.

Description

technical field [0001] The invention relates to the field of advanced treatment of industrial wastewater, in particular to an advanced treatment system and a treatment process for coupling and combining ozone, electrochemistry and Fenton oxidation. Background technique [0002] After biological treatment of industrial wastewater, the remaining organic matter is usually difficult to biodegrade. Usually these organic substances have the "three causes" of carcinogenicity, teratogenicity and mutagenicity, which are extremely harmful and must be removed deeply. For these low-concentration refractory organic substances, advanced oxidation technology is mainly used to remove them. Among many advanced oxidation technologies, photocatalysis, wet catalytic oxidation, electrocatalysis and ultrasonic oxidation are relatively expensive, and they are mainly limited to the laboratory research stage. . At present, the advanced oxidation technology widely used in industry is the advanced o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 李海波王靖宇
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD