A kind of recycling treatment method of oil refinery wastewater

A technology for oil refining wastewater and treatment methods, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Treatment and reuse, stable operation effect

Active Publication Date: 2015-11-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to a certain amount of soluble microbial products (such as polysaccharides, humic acids, etc.) and calcium and magnesium remaining in the effluent from biochemical treatment, reverse osmosis membranes driven by transmembrane pressure differences are also prone to clogging and flux decline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Using the refinery wastewater reuse treatment method of the present invention, the process flow is oil separation-flotation-SBR-OMBR, and the specific test conditions are as follows:

[0014] The effluent from the oil separation and flotation of the sewage treatment plant of the upper refinery is treated with a 10LSBR small test device. The main operating conditions are: wastewater temperature 25°C, pH 7.0, sludge concentration (MLSS) 3500mg / L, hydraulic retention time 15h, The sludge residence time is 25 days, the SBR operation cycle is 12 hours, and the method is water intake-(aeration-stirring) repeated 3 times-sedimentation-decanting water, in which water intake is 1.0h per cycle, aeration (aerobic) / stirring (anaerobic) Oxygen) 8.0h, precipitation 2.0h, decanting 1.0h, the time ratio of aeration and stirring is 1:1.

[0015] The SBR effluent is treated with a 10LOMBR small-scale test device. The OMBR membrane is a 0.1m×0.5m triacetate fiber forward osmosis membrane ...

Embodiment 2

[0020] Using the method for treating oil refinery wastewater of the present invention, the technological process is oil separation-flotation-SBR-OMBR, and the above-mentioned wastewater is treated under optimized technological conditions.

[0021] In the present invention, the oil removal and suspended matter treatment effluent is treated with SBR. The operating conditions of SBR are: wastewater temperature 30°C, pH 7.0, sludge concentration (MLSS) 5000mg / L, hydraulic retention time (HRT) 20h, sludge retention time (SRT) 20d, volume load (organic load) 0.40kgCOD / (m 3 d) The dissolved oxygen in the aerobic process is 2.0mg / L, and the dissolved oxygen in the anaerobic process does not exceed 0.4mg / L. The SBR operation cycle is 20h, and the method is water intake-aeration-stirring (anaerobic)-sedimentation-decanting, Among them, water intake is 1.0h, aeration (aerobic) / stirring (anaerobic) is 17.0h, precipitation is 1.0h, decanting is 1.0h, and the time ratio of aeration and st...

Embodiment 3

[0026] Using the refinery wastewater treatment method of the present invention, the process flow is oil separation-flotation-SBR-OMBR, and the above-mentioned wastewater is treated under optimized process conditions. The main indicators of the influent and treated effluent are shown in Table 3.

[0027] In the present invention, the oil removal and suspended matter treatment effluent is treated with SBR. The operating conditions of SBR are: wastewater temperature 40°C, pH 6.5, sludge concentration (MLSS) 3000mg / L, hydraulic retention time (HRT) 15h, sludge retention time (SRT) 15d, volumetric load (organic load) 0.30kgCOD / (m 3d) The dissolved oxygen in the aerobic process is 4.0mg / L, and the dissolved oxygen in the anaerobic process does not exceed 0.3mg / L. The SBR operation cycle is 12h, and the method is water intake-aeration-stirring (anaerobic)-sedimentation-decanting, Among them, water is fed for 1.0h, aeration (aerobic) / stirring (anaerobic) is 10.0h, sedimentation is 0...

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Abstract

The invention discloses a reusing treatment method of refinery waste water. Oil removing and suspended matter treatment, sequencing bath reactor (SBR) treatment and osmotic membrane bioreactor (OMBR) treatment are performed in sequence on the refinery waste water. The reusing treatment method is suitable for deep purification and reusing treatment of various types of waste water in an oil refinery, and the water quality of treated water is similar to that of reverse osmosis outlet water.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a recycling treatment method for oil refinery waste water. Background technique [0002] my country's oil refinery wastewater treatment process is generally oil separation-flotation-biochemical treatment-clarification. Biochemical treatment is usually traditional activated sludge method, A / O method, biological activated carbon method, etc. Although this type of biochemical treatment process is mature, there are The land area is large, the treatment efficiency is low, and the effluent quality is not high and unstable. As some provinces and cities in my country (Beijing, Tianjin, Jiangsu, Shandong, Liaoning, etc.) implement stricter local wastewater discharge standards (COD≤60mg / L or 50mg / L), the current treatment process of refineries is facing the problem of meeting the discharge standards. [0003] Many refineries in my country are located in water-scar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 李凌波
Owner CHINA PETROLEUM & CHEM CORP
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