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Advanced sewage treatment technology

A technology for advanced treatment and sewage, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of catalyst being attached by dirt and high catalytic activity, and achieve the benefit of catalyst Regeneration, simple process, beneficial to the effect of activity stability

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a sewage advanced treatment process, which solves the problem of the catalyst being adhered to by dirt, has high catalytic activity, realizes the repeated use of the catalyst, has simple process, strong controllability and low cost

Method used

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  • Advanced sewage treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] When the COD of the treated sewage is less than 70mg / L, the sewage first enters the dosing tank, and a sodium hypochlorite solution with an effective chlorine content of 10% is added to the sewage, and the volume ratio of the sewage to the sewage is 0.2ml / L. The sewage then enters the catalytic oxidation tower, and the tower is filled fixed bed catalyst. In the pre-oxidation section, the reaction time is 20 minutes, and the COD drops below 65mg / L; then it enters the pH adjustment pool, uses 10% dilute sulfuric acid to adjust the pH of the sewage to 3.2, and then enters the electrolytic cell, in which the suspended particle catalyst is added. The volume of the oxidation pool is 10%. The electrolytic cell uses 316L stainless steel as the plate, the distance between each pair of electrodes is 3 cm, and a 4V DC voltage is applied to each pair of electrodes. The residence time of the sewage in the electrolytic cell is 30 minutes; the suspended particle catalyst flows to the ...

Embodiment 2

[0034] When the COD of the treated sewage is about 120mg / L, the sewage first enters the dosing tank, and 2ml / L (volume ratio to sewage) of sodium hypochlorite solution containing 10% available chlorine is added to the sewage, and the sewage enters the catalytic oxidation tower. The fixed bed catalyst is loaded in the middle, and the reaction time of the pre-oxidation section is 30 minutes, and the COD drops below 70mg / L; then enters the pH adjustment pool, uses 10% dilute sulfuric acid to adjust the pH of the sewage to 3.0, enters the electrolytic cell, and adds suspension to the electrolytic cell Granular catalyst, the catalyst accounts for 50% of the volume of the catalytic oxidation tank. The electrolytic cell uses 316L stainless steel as the plate, the distance between each pair of electrodes is 6 cm, and a 6V DC voltage is applied to each pair of electrodes. The residence time of the sewage in the electrolytic cell is 30 minutes; the suspended particle catalyst flows to th...

Embodiment 3

[0036] When the COD of the treated sewage is about 150mg / L, the sewage first enters the dosing tank, and 5ml / L (volume ratio to sewage) of sodium hypochlorite solution containing 10% available chlorine is added to the sewage, and the sewage enters the catalytic oxidation tower. The fixed bed catalyst is loaded in the middle, and the reaction time of the pre-oxidation section is 60min, and the COD drops below 90mg / L; then enters the pH adjustment pool, uses 10% dilute sulfuric acid to adjust the pH of the sewage to 3.5, enters the electrolytic cell, and adds suspension to the electrolytic cell Granular catalyst, the catalyst accounts for 40% of the volume of the catalytic oxidation tank. The electrolytic cell uses 316L stainless steel as the plate, the distance between each pair of electrodes is 6 cm, and a 5V DC voltage is applied to each pair of electrodes. The residence time of the sewage in the electrolytic cell is 60 minutes; the suspended particle catalyst flows to the reg...

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Abstract

The invention belongs to the field of environmental protection and particularly relates to an advanced sewage treatment technology which comprises the following steps: after being subjected to biochemical treatment, sewage sequentially passes through a preoxidation unit, an electrolysis catalytic oxidation unit, a regeneration unit, a catalyst ultrasonic cleaning unit and a catalyst separating unit to meet the discharge standard. The static bed catalytic oxidation technology is adopted to reduce the COD load to a certain level, so that the follow-up COD load of a subsequent electrolysis catalytic oxidation unit is also reduced, the improvement on the sewage treatment depth is facilitated, and the effluent quality is better and more stable. With a static bed catalytic oxidation unit arranged in front, heavy metals and other materials in water toxic to a catalyst can be intercepted, so that a suspended particle catalyst with higher production cost can be protected, and the service life of the catalyst is prolonged. By timely adjusting the dosage of an oxidizing agent, the problem about load fluctuation can be instantly solved, the problem that the suspended particle catalyst is attached by dirt is also solved, the recycling of the suspended particle catalyst is realized, and the cost is lower.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a sewage advanced treatment process. Background technique [0002] In general, the composition of sewage is relatively complex. In addition to various organic pollutants, it also contains various inorganic substances, such as metal ions and acid radical ions. The common ones are Ca 2+ , Mg 2+ 、Na + 、K + , Cl - , SO 4 2- Wait. In the experimental practice, it was found that during the electrolytic catalytic oxidation reaction, Ca 2+ Calcium carbonate scale will be formed on the surface of the catalyst, covering the active center of the catalyst, affecting the activity of the catalyst, resulting in a decrease in the efficiency of oxidative degradation of organic pollutants, and affecting the quality of effluent water. [0003] Chinese patent CN201220304579.7 "Electrolytic catalytic oxidation wastewater treatment device", the main point of the invention is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 潘咸峰邹宗海黄斌王建娜李波刘婷婷
Owner CHINA PETROLEUM & CHEM CORP
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