Apparatus and method for recovering petroleum and phenols from oilfield produced wastewater

A technology for oil production wastewater and petroleum, which is applied in the fields of resource recycling and environmental engineering, can solve the problems of non-recycling of phenols, waste of resources, and high cost, etc., to reduce the cost of sludge treatment, low cost of wastewater treatment, and realize comprehensive utilization Effect

Inactive Publication Date: 2016-05-25
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. The recovered oil contains a large amount of impurities, which makes it difficult to process the recovered oil for subsequent use;
[0011] 2. It consumes a lot of flocculants and coagulants, resulting in high operating costs;
[0012] 3. A large amount of oily sludge will be produced, and the further treatment of sludge will incur more costs;
[0013] 4. Wastewater contains a large amount of phenols without recycling, which not only causes waste of resources, but also affects the subsequent biochemical treatment effect of oil recovery wastewater

Method used

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  • Apparatus and method for recovering petroleum and phenols from oilfield produced wastewater
  • Apparatus and method for recovering petroleum and phenols from oilfield produced wastewater
  • Apparatus and method for recovering petroleum and phenols from oilfield produced wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0047] (1) Demulsification: Collect the oil production wastewater into the wastewater regulating tank 1 through the pipeline and mix it evenly in the wastewater regulating tank 1 to adjust the water volume of the wastewater. It is detected that the oil content is 50mg / L, the COD is 300mg / L, and the SS is 50mg / L. L, salt content is 1000mg / L, pH is 6.5. Add sulfuric acid to the demulsification tank 3 of the demulsification tank 3 of the demulsification tank 3 of the oil production waste water that has passed through the wastewater adjustment tank 1, and adjust the pH to 6 to break the demulsification.

[0048] (2) Oil recovery: pump the oil extraction waste water obtained from demulsification in step (1) into the gravity sedimentation tank 4, and recover oil 49g / m after separation and recovery by gravity settling 3 and deoiling wastewater, petroleum is stored in the petroleum storage tank 4-1, and deoiling wastewater is stored in the wastewater collection pool 4-2.

[0049] The...

Embodiment 2

[0052] (1) Demulsification: Collect the oil production wastewater into the wastewater regulating tank 1 through the pipeline and mix it evenly in the wastewater regulating tank 1 to adjust the water volume of the wastewater. It is detected that the oil content is 600mg / L, the COD is 7000mg / L, and the SS is 500mg / L. L, the salt content is 200000mg / L, and the pH is 9.5. Pump the oil production wastewater that has passed through the wastewater adjustment tank 1 into the demulsification tank 3, add sulfuric acid to adjust the pH to 2 for demulsification, and press 1g / m 3 Join PAM.

[0053] (2) Oil recovery: the oil production wastewater obtained in step (1) demulsification is separated and recovered by a centrifuge to obtain 6198g / m of oil 3 And oil production wastewater, petroleum is stored in petroleum storage tank 4-1, and deoiled oil recovery wastewater is stored in wastewater collection pool 4-2, and its COD is 900mg / L.

[0054] The centrifugal separation is to pump the dem...

Embodiment 3

[0057] (1) Demulsification: Collect the oil production wastewater into the wastewater regulating tank 1 through the pipeline and mix it evenly in the wastewater regulating tank 1 to adjust the water volume of the wastewater. The oil content is 450mg / L, the COD is 610mg / L, and the SS is 200mg / L. L, salt content is 3200mg / L, pH is 7.2. Pump the oil extraction wastewater that has passed through the wastewater adjustment tank into the pH adjustment tank (demulsification tank) 3, add hydrochloric acid to adjust the pH to 3 for demulsification, and press 5g / m 3 Join PAM.

[0058] (2) Oil recovery: The oil production wastewater obtained in step (1) demulsification is separated and recovered by air flotation to obtain 448g / m of oil 3 And deoiling wastewater, petroleum is stored in petroleum storage tank 4-1, and deoiling wastewater is stored in wastewater collection pool 4-2, and its COD is 165mg / L.

[0059] The air flotation separation is to pump the demulsified oil extraction wast...

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Abstract

An apparatus for recovering petroleum and phenols from oilfield produced wastewater is formed by a wastewater equalization pool, a demulsification pool, a gravity settling pool or a centrifuge or an air floatation device, a petroleum storage tank, a wastewater collecting pool, a phenol adsorption tower, an eluant storage tank, a phenol-containing eluate storage tank, an adsorption tower dephenolized wastewater storage tank, a phenol extraction tank extractant storage tank, a distillation tower and a phenol storage tank. A recovery method adopting the apparatus comprises the following steps: 1, adding an acid to the oilfield produced wastewater to adjust the pH value to 2-6 in order to demulsify; 2, carrying out gravity settlement, centrifuge or air floatation separation on the demulsified oilfield produced wastewater to obtain recovered petroleum and deoiled or dewaxed wastewater; and 3, allowing the deoiled or dewaxed wastewater to go through the adsorption tower and to adsorb phenols in the wastewater, and adding a 5-10% sodium hydroxide solution or alcohol after absorption is saturated to elute in order to regenerate an adsorbent and recover phenols. Influences of phenol wastewater treatment on biochemical treatment are eliminated through recovering petroleum and phenols from the oilfield produced wastewater, and the apparatus and the method simultaneously realize treatment of pollution of the oilfield produced wastewater and recycling of resources.

Description

technical field [0001] The invention relates to a device and a method for recovering petroleum and phenol from oil production wastewater, in particular to a device and method for recovering petroleum and phenol from oil production wastewater by adopting the combined treatment of pH adjustment, demulsification, gravity sedimentation separation, centrifugal separation or air flotation and adsorption and the like. The method belongs to the fields of resource recycling and 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
Inventor 罗依依
Owner BOYING XIAMEN SCI & TECH
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