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Oil-field wastewater treating and recycling device

A technology for oil extraction wastewater and desalination device, which is applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the problems of fouling, high cost, membrane calcification, etc. Effect

Inactive Publication Date: 2015-10-28
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a treatment and recycling device for oil production wastewater, the main purpose of which is to overcome the defects of film calcification, serious fouling and high cost in the treatment process of oil field production water film method in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] An oil extraction wastewater treatment and recycling device, refer to figure 1 , Including oil removal system, chemical decalcification system, membrane filtration system and desalination system.

[0039] The oil removal system is used to remove the oil pollution in the oil production wastewater. The oil removal system includes the air flotation tank 11 (or adsorption tank), the inlet of the air flotation tank (or adsorption tank) is connected to the oil extraction wastewater discharge water outlet, and the air flotation tank (or adsorption tank) The outlet is connected to a chemical decalcification system.

[0040] The chemical decalcification system is used to remove calcium and magnesium ions in the oil production wastewater and reduce the hardness of the water. The chemical decalcification system includes a decalcification reaction tank 21, a sedimentation tank 22 and a clear tank 23. The inlet of the decalcification reaction tank 21 is connected to an air floatation tank...

Embodiment 2

[0050] An oil extraction wastewater treatment and recycling device, refer to figure 2 , Including oil removal system, chemical decalcification system, membrane filtration system and desalination system.

[0051] The oil removal system is used to remove oil from the oil production wastewater. The oil removal system includes an air flotation tank 11 (or adsorption tank), the inlet of the air flotation tank (or adsorption tank) is connected to the oil extraction wastewater discharge water outlet, and the air flotation tank (or adsorption tank) The outlet is connected to a chemical decalcification system.

[0052] The chemical decalcification system is used to remove calcium and magnesium ions in the oil production wastewater and reduce the hardness of the water. The chemical decalcification system includes a decalcification reaction tank 21, a sedimentation tank 22 and a clear tank 23. The inlet of the decalcification reaction tank 21 is connected to an air floatation tank. 11 or the...

Embodiment 3

[0062] An oil extraction wastewater treatment and recycling device, refer to image 3 , Including oil removal system, chemical decalcification system, electrolysis system, membrane filtration system and desalination system.

[0063] The oil removal system is used to remove oil from the oil production wastewater. The oil removal system includes an air flotation tank 11 (or adsorption tank), the inlet of the air flotation tank (or adsorption tank) is connected to the oil extraction wastewater discharge water outlet, and the air flotation tank (or adsorption tank) The outlet is connected to a chemical decalcification system.

[0064] The chemical decalcification system is used to remove calcium and magnesium ions in the oil production wastewater and reduce the hardness of the water. The chemical decalcification system includes a decalcification reaction tank 21, a sedimentation tank 22 and a clear tank 23. The inlet of the decalcification reaction tank 21 is connected to an air floatat...

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Abstract

An oil-field wastewater treating and recycling device comprises an oil removing system, a chemical decalcification system, a membrane filtration system and a desalting system; the oil removing system comprises an air floatation tank and an adsorption tank, the chemical decalcification system comprises a decalcification reaction tank, a sedimentation tank and a clean water tank, the membrane filtration system comprises a filtering membrane and a filtering water producing tank, the desalting system comprises a desalting device, a concentrated solution outlet of the desalting device is used for directly discharging, and a dialysis solution outlet of the desalting device is connected to a boiler. According to the device provided by the invention, through air floatation, the oil can be effectively removed, the CODcr is reduced, the calcification of the membrane is eliminated, the blockage of the membrane is avoided, the indexes, such as SS and turbidity, of waste water are reduced, the metal ions in water are removed, the salt content is reduced, and the recovery rate of 50 to 65 percent of oil-field wastewater is realized.

Description

technical field [0001] The invention belongs to the field of water pollution control of environmental engineering, and more specifically refers to an oil production wastewater treatment and recycling device. Background technique [0002] Oilfield produced water is mainly the sewage released during the production and treatment of crude oil. There are many ways to treat oilfield produced water according to different requirements for discharge or reuse. As the feed water for steam generators or boilers, it is necessary to strictly control the content of calcium ions, magnesium ions and other ions that are easy to scale in the water, the total salinity, water oil content etc. There are many reports on the use of membrane separation technology to desalinate oilfield produced water, which makes the produced water regenerate and recycle. The main pollutant indicators after general pretreatment to remove most of the oil content and suspended solids in oilfield produced water are:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F9/14C02F103/10
Inventor 王峰张世文
Owner BOYING XIAMEN SCI & TECH
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