Method for treating oil refining wastewater

A technology for oil refinery wastewater and treatment pools, applied in the field of water treatment, can solve the problems of no removal effect and low ammonia nitrogen removal efficiency, and achieve the effects of saving investment, avoiding inhibition and lethal effects, and saving investment and operating costs

Inactive Publication Date: 2013-10-30
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low or even no removal effect on ammonia nitrogen removal by refinery wastewater treatment facilities, and propose a refinery wastewater treatment process with high treatment efficiency, strong impact load resistance, stable effluent quality, and low investment and operating costs , the process has the characteristics of highly efficient removal of ammonia nitrogen and denitrification

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  • Method for treating oil refining wastewater

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Embodiment 1

[0026]For the refinery wastewater of an oil refinery, oil separation and air flotation are used for pretreatment. The pretreated water temperature is 25-40°C, COD400-1500mg / L, and ammonia nitrogen 35-120mg / L. Then adopt the steps and methods mentioned in the summary of the invention in sequence, that is, the process of primary biochemical (contact oxidation), secondary biochemical (activated sludge), tertiary biochemical (activated sludge) and sedimentation process. Both the mixed solution of the third-stage biochemical tank and the sludge of the sedimentation tank are returned to the second-stage biochemical tank, and the reflux ratio is 150% and 50% respectively. The first-level biochemical pool is filled with suspended packing, a heat exchanger is installed, and the water temperature is adjusted to about 30°C with fresh water; the third-level biochemical pool is installed with combined packing. Blast aeration makes the dissolved oxygen in the first biochemical pool, the fro...

Embodiment 2

[0028] The volume of refinery wastewater in an oil refinery is about 50m 3 / h, after oil separation-air flotation pretreatment, the average COD and ammonia nitrogen of the effluent are about 800mg / L and 70mg / L, and the water temperature is 30-45°C. The effluent treated by the original treatment device of the plant far exceeds the discharge standard and has no removal effect on ammonia nitrogen. After the technical transformation of the original treatment device by the method of the present invention, the waste water can be discharged up to the standard without adding new structures.

[0029] The original treatment device adopts the process of "oil separation, air flotation, primary biochemical (contact oxidation), secondary biochemical (contact oxidation), tertiary biochemical (contact oxidation), and precipitation". The hydraulic retention time of each biological treatment tank is 11.7h, and elastic fillers are installed in the tanks, and the sludge from the sedimentation tan...

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Abstract

The invention relates to a method for treating oil refining wastewater. The method comprises the following steps: oil removal, air flotation, a first level biochemical treatment, a second level biochemical treatment, a third level biochemical treatment, and precipitation. A first level biochemical treatment unit is provided with a heat exchanger to reduce temperature of wastewater; a second level biochemical treatment unit is used for nitrogen removal by denitrification; a third level biochemical treatment unit conducts nitration of ammonia nitrogen and removal of pollutants such as residual organic compounds; and a mixed liquor from the third level biochemical treatment unit and the sludge from a precipitation treatment unit flow back to the second level biochemical treatment unit. The invention mainly solves the problem that a refining wastewater treatment facility has low efficiency of ammonia nitrogen removal or even no effect on ammonia nitrogen removal. The process has the advantages of high efficiency of ammonia nitrogen removal and nitrogen removal, high treatment efficiency, strong shock resistance, stable and standard achieved quality of outlet water, and low investment and operation cost.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method for treating oil refining wastewater, in particular to a method for treating ammonia nitrogen in oil refining wastewater. Background technique [0002] Refinery wastewater has the characteristics of large water volume, many types of pollutants, many refractory substances, and large fluctuations in water quality and volume. Therefore, the treatment process is complicated and the hydraulic retention time is long. Refinery wastewater generally adopts the treatment process of "oil separation-air flotation-biochemical" as a whole, and the biological treatment process is the focus of the design of refinery wastewater treatment process. The biological treatment process mainly adopts activated sludge, contact oxidation and biological filter. In addition, there are also single biochemical treatment processes such as SBR, biological turntable, oxidation pond, membrane biorea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 李国欣
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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