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Method and device for deeply treating oil refinery wastewater through ultraviolet and catalytic ozonation

A technology for ozone catalytic oxidation, refining and chemical wastewater, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Low, improve the dissolution efficiency, the effect of low investment

Inactive Publication Date: 2015-10-28
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used advanced treatment methods include ozone catalytic oxidation, electrocatalytic oxidation, Fenton oxidation, microwave oxidation and other advanced oxidation processes. However, with the further reduction of COD concentration, the energy consumption and operating cost of various processes will increase. Amplitude increase

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  • Method and device for deeply treating oil refinery wastewater through ultraviolet and catalytic ozonation

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Embodiment 1

[0016] A refining and chemical plant in Shaanxi, daily treatment of refining and chemical wastewater 600m 3 , the COD of the external drainage is between 55-60mg / L. In order to meet the requirements of wastewater treatment upgrading and transformation, the COD of the external drainage is required to be ≤40mg / L. Pilot test, the processing capacity of the device is 10m 3 / h, when the ozone gas concentration is 150mg / L, the wastewater residence time in the enhanced reactor is 20min, and the COD is reduced from 60mg / L to 38mg / L, meeting the treatment requirements after the discharge standard is raised.

Embodiment 2

[0018] A refinery in Shandong, daily treatment of refinery wastewater 1000m 3 , after degreasing, flocculation and sedimentation, and biochemical treatment, the COD is reduced to below 60mg / L. Faced with increasingly stringent environmental protection policies, the biochemical effluent of the sewage field on the site needs to undergo advanced treatment, requiring COD ≤ 40mg / L. The method for advanced treatment of refinery wastewater by ultraviolet synergistic ozone catalytic oxidation of the present invention is used for on-site pilot test, and the treatment capacity of the device is 20m 3 / h, when the ozone gas concentration is 180mg / L, the residence time of wastewater in the enhanced reactor is 30min, and the COD is reduced from 60mg / L to 35-40mg / L, which meets the discharge requirements after the sewage field standard is raised.

Embodiment 3

[0020] A refinery in Gansu, daily treatment of refinery wastewater 2000m 3 , the COD of the external drainage after wastewater treatment is between 55-60mg / L. In order to realize the protection of the ecological environment in the western region, it is required that the COD of the external drainage should be reduced to below 30mg / L. The method for advanced treatment of refinery wastewater by ultraviolet synergistic ozone catalytic oxidation of the present invention is used for on-site pilot test, and the treatment capacity of the device is 15m 3 / h, when the ozone gas concentration is 200mg / L, the residence time of wastewater in the enhanced reactor is 40min, and the COD is reduced from 60mg / L to below 30mg / L, meeting the discharge requirements after the sewage field standard is raised.

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Abstract

The invention provides a method and device for deeply treating oil refinery wastewater through ultraviolet and catalytic ozonation. The method comprises the steps that the oil refinery wastewater and ozone are mixed through a gas-liquid mixing pump to obtain milky gas-liquid mixing pump yielding water which is rich in ozone microbubbles; the gas-liquid mixing pump yielding water enters a reaction tower of which the upper portion is loaded with an ozone catalyst to react, the reaction tower achieves upper input and lower output, a oxidative degradation reaction is firstly performed on the lower portion of the reaction tower, then a catalytic oxidation is performed on the upper portion of the reaction tower to degrade organic pollutants in the wastewater, reaction tower yielding water is conveyed into an enhancement reactor with a high intensity ultraviolet lamp to perform an ultraviolet-ozone co-oxidation reaction to degrade the pollutants, and yielding water meeting the standard is obtained. According to the method, the dissolving efficiency of the ozone in the wastewater can be improved, the oxidation performance of the ozone is enhanced, the energy of the high intensity ultraviolet lamp can be efficiently utilized, and therefore the oil refinery wastewater can meet the standard and then be drained after being deep treated; the device has the advantages of being low in investment and operation cost.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method and device for advanced treatment of refinery wastewater by ultraviolet synergistic ozone catalytic oxidation. Background technique [0002] With the increasingly stringent environmental protection requirements, the discharge requirements of refinery wastewater have been further improved, and the COD concentration of the treated wastewater has been raised from 60mg / L to 40mg / L, or even 30mg / L. Therefore, the advanced treatment of wastewater in various enterprises is imminent. At present, the commonly used advanced treatment methods include ozone catalytic oxidation, electrocatalytic oxidation, Fenton oxidation, microwave oxidation and other advanced oxidation processes. However, with the further reduction of COD concentration, the energy consumption and operating cost of various processes will increase. Amplitude increased. Therefore, it is considered to effectively comb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
Inventor 李亮付春明滕厚开李超张艳芳郝润秋
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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