Oil refining sewage integrated combination treatment system and oil refining sewage integrated combination treatment method

Abstract

The invention relates to an oil refining sewage integrated combination treatment system and an oil refining sewage integrated combination treatment method, and belongs to the technical field of sewage treatment. The system comprises a biochemical treatment unit and a Fenton fluidized bed treatment unit, wherein the biochemical treatment unit is connected with the Fenton fluidized bed treatment unit through a water drain pipeline, the biochemical treatment unit removes most of COD and almost all of ammonia nitrogen in the oil refining sewage through the multi-stage biological treatment system, the drained water of the biochemical unit contains a lot of difficultly-biodegraded organic matters, more than or equal to 60% of the difficultly-biodegraded organic matters can be removed in the Fenton fluidized bed treatment unit, and the effluent after the Fenton strong oxidation does not contain pathogenic microorganisms. According to the present invention, in the petroleum sewage treated by the integrated combination system, the total removal rates of COD and ammonia nitrogen can achieve more than or equal to 95%, and the effluent meets the first grade A standard of the municipal wastewater treatment plant pollutant discharge standard (GB18918-2002).

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to an integrated device for oil refinery sewage combined treatment process. technical background [0002] During the processing and production process of oil refining and chemical plants, the industrial wastewater obtained includes: crude oil desalted water, product washing water, stripping steam condensate water, oil tank dehydration, machine pump cooling water, cooling tower and boiler blowdown water, etc. Its characteristics are: The amount of wastewater is large, the water quality is complex, the water quality fluctuates greatly, the content of organic matter is high, and it contains a variety of heavy metals. At present, most domestic refining and chemical enterprises use the "oil separation-air flotation-biochemical" process. The biochemical section is greatly affected by the effluent quality of the pre-treatment process when treating sewage. When it is impacted by ...

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Problems solved by technology

Chinese patent CN 203625104U adopts ozone method to carry out advanced treatment of oil refinery sewage after biochemical treatment. The disadvantage of this patent is that high-pressure pumps, high-pressure ozone catalytic oxidation towers, and liquid oxygen storage tanks are used, resulting in high equipment costs. Two-stage ozone treatment is used. The system makes the processing unit too long, causing difficulties in operation and management

Chinese patent CN 200920286427 uses ozone, biological activated carbon, ultrafiltration device, precision filtration device, reverse osmosis device, pure water pool and anion and cation exchange bed to carry out advanced treatment of oil refinery sewage. The disadvantage of this patent is that the treatment unit is too long and physical treatment is used. The method-based process has huge initial investment. Due to the use of ultrafiltration membranes, reverse osmosis membranes and other membrane components, long-term operation will cause membrane clogging and difficult cleaning, which further increases the processing cost.

[0005] In view of the fact that the existing refinery sewage advanced treatment technology basically does not have a good treatment effect, and due to factors such as high equipment cost, complicated operation, and high operating costs, the development of efficient treatment technology is directly restricted

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