Treatment device and method for oil extraction wastewater

A technology for oil extraction wastewater and treatment device, which is applied in mining wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., and can solve problems such as large consumption of flocculants and coagulants, difficulties in recycling oil processing, and inability to meet discharge standards. , to achieve the effect of saving the cost of chemicals, reducing the cost of sludge treatment, and reducing the cost of wastewater treatment

Inactive Publication Date: 2015-12-23
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 1. The recovered oil contains a large amount of impurities, which makes it difficult to process the recovered oil for subsequent use;
[0013] 2. The oil production wastewater is directly air flotation after gravity settlement, which consumes a lot of flocculants and coagulants, resulting in high operating costs;
[0014] 3. A large amount of oily sludge will be produced, and the further treatment of sludge will incur more costs;
[0015] 4. The water quality indicators of oil production wastewater after oil recovery usually cannot meet the discharge standards required in the "Technical Specifications for Oil Production Wastewater Treatment Engineering" (HJ2041-2014)

Method used

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  • Treatment device and method for oil extraction wastewater
  • Treatment device and method for oil extraction wastewater
  • Treatment device and method for oil extraction wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Demulsification: Collect the oil production wastewater through the pipeline in the wastewater conditioning tank 1-1 and mix it evenly in the wastewater conditioning tank 1-1 to adjust the amount of wastewater. The SS was 50 mg / L, the salt content was 1000 mg / L, and the pH was 6.5. Pump the oil production wastewater that has passed through the wastewater conditioning tank 1 into the demulsification tank 1-3, add sulfuric acid to adjust the pH to 6 for demulsification, and press 5g / m 3 Join PAM.

[0064] (2) Oil recovery: pump the oil production wastewater obtained by demulsification in step (1) into gravity settling tanks 1-5, and recover 49g / m of oil through gravity settling separation and recovery. 3 The oil is stored in oil storage tanks 1-6 and the deoiled oil recovery wastewater is stored in wastewater collection tanks 1-7. The COD of the wastewater is reduced from 300mg / L to 256mg / L.

[0065] In the gravity sedimentation separation, the oil extraction wastewa...

Embodiment 2

[0074] (1) Demulsification: collect the oil production wastewater in the regulating tank 1-1 through the pipeline and mix it evenly in the regulating tank 1-1, adjust the amount of wastewater, and detect that the oil content is 6100mg / L, the COD is 7000mg / L, and the SS is 6100mg / L. 500mg / L, the salt content is 200000mg / L, and the pH is 9.5. Pump the oil production wastewater that has passed through the adjustment tank into the pH adjustment tank (demulsification tank) 1-3, add sulfuric acid to adjust the pH to 2 for demulsification, and press 10g / m 3 Join PAM.

[0075] (2) Petroleum recovery: The oil production wastewater obtained by demulsification in step (1) is separated and recovered by a centrifuge to obtain 5998 g / m of petroleum. 3 And deoiling oil recovery wastewater, oil is stored in storage tanks 1-6, deoiling oil recovery wastewater is stored in wastewater collection tanks 1-7, and the COD of wastewater drops from 7000mg / L to 892mg / L.

[0076] The centrifugal separ...

Embodiment 3

[0085] (1) Demulsification: Collect the oil production wastewater through the pipeline in the wastewater conditioning tank 1-1 and mix it evenly in the wastewater conditioning tank 1-1, adjust the amount of wastewater, and detect that its oil content is 450 mg / L, COD is 610 mg / L, The SS was 200 mg / L, the salt content was 3200 mg / L, and the pH was 7.2. Pump the oil production wastewater that has passed through the wastewater conditioning tank 1 into the demulsification tank 1-3, add hydrochloric acid to adjust the pH to 4 for demulsification, and press 1 g / m 3 Join PAM.

[0086] (2) Oil recovery: The oil extraction wastewater obtained by demulsification in step (1) was separated and recovered by a centrifuge to obtain 448 g / m of oil. 3 And deoiling wastewater, oil is stored in petroleum storage tanks 1-6, and deoiling and oil recovery wastewater is stored in wastewater collection tanks 1-7.

[0087] The centrifugal separation is to pump the oil production wastewater after dem...

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Abstract

The invention discloses a treatment device for oil extraction wastewater. The device comprises an oil recovery unit, a microelectrolysis unit, a biochemical treatment unit, an electrolysis unit and a sludge treatment unit; and a treatment method for the oil extraction wastewater comprises the following steps sequentially: carrying out demulsification, carrying out oil recovery, carrying out microelectrolysis, carrying out anaerobic treatment, carrying out aerobic treatment and carrying out electrolytic treatment. According to the device and the method, through recovering petroleum and phenol from the oil extraction wastewater and recovering waxy ingredients, good conditions are created for subsequent wastewater treatment, the influence on biochemical treatment caused during phenolic wastewater treatment is eliminated, and the recycling of resources is realized while oil extraction wastewater pollution is treated, so that the quality of the wastewater can reach emission standards in technical specifications for oil extraction wastewater treatment engineering (HJ2041-2014).

Description

technical field [0001] The present invention relates to a treatment device and method for oil extraction wastewater, in particular to a device for treating oil extraction wastewater by adjusting pH and demulsification, gravity sedimentation separation, centrifugal separation or air flotation separation, micro-electrolysis, anaerobic, aerobic and other processes. The method belongs to the field of water pollution control of environmental engineering. Background technique [0002] At present, my country's onshore oil fields basically adopt the water injection development method, that is, inject high-pressure water into the formation to drive crude oil to be extracted from the oil well. After a period of water injection, the injected water will be produced together with the crude oil. As the development time prolongs, the water content of the produced crude oil will continue to rise. Oilfield oil production wastewater (also known as "produced water") that is extracted together...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/12C02F1/461C02F103/10
CPCC02F11/12
Inventor 张世文杨幼军王峰殷明彩
Owner BOYING XIAMEN SCI & TECH
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