Process and apparatus for oil eliminating by pressure dissolved air floatation with nitrogen as gaseous source

A technology of dissolved air flotation and gas source, which is applied in the direction of grease/oily substance/suspton removal device, separation method, flotation water/sewage treatment, etc., to achieve the effect of solving hidden safety hazards and broad market prospects

Inactive Publication Date: 2007-06-27
XI AN JIAOTONG UNIV +1
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Problems solved by technology

The other is a closed pressure dissolved air flotation device using natural gas as the gas source. Although this method avoids oxygenation of the produced water, it also has other problems, such as safety issues. Since the main components of natural gas are methane, ethane Flammable gases such as alkane

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  • Process and apparatus for oil eliminating by pressure dissolved air floatation with nitrogen as gaseous source

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Embodiment Construction

[0017] The present invention uses nitrogen instead of natural gas to carry out closed circulation, nitrogen is led to the gas dissolving tank after being passed through a gas compressor, and most of the gas is dissolved in the oily sewage in the air flotation treatment tank by adding pressure. Most of the nitrogen gas is dissolved in the oily sewage, and the nitrogen-containing gas produces fine bubbles, which take away the oil droplets and suspended solids in the oily sewage, and collect the treated clear water.

[0018] Referring to Fig. 1, device of the present invention comprises air flotation treatment tank 5, is characterized in that, the upper gas outlet of described air flotation treatment tank 5 is communicated with a nitrogen tank 2, is connected with membrane separator 1 on the nitrogen tank 2, And link to each other with dissolved gas tank 4 through gas compressor 3, dissolved gas tank 4 is connected with air flotation treatment tank 5;

[0019] The membrane separa...

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Abstract

A method and apparatus using N2 as gas source for removing oil from sewage by pressurized dissolving gas and air floating is disclosed. Said method includes such steps as compressing N2 by air compressor, filling it in gas-dissolving tank, pressurizing to dissolve the most of N2 in the sewage, filling the sewage in contact chamber, spraying it out by the dissolved gas releasing unit to make the N2 escape out from solution to generate fine N2 bubbles, and carrying the oil drops and suspended particles upward for removing oil.

Description

technical field [0001] The invention belongs to a sewage treatment method, relates to sewage treatment in the technical field of petroleum production, and is a novel pressure dissolved air flotation and oil removal method and device using nitrogen as a gas source. Background technique [0002] In the petroleum and chemical industry, a large amount of oily sewage needs to be treated. For decades, with the rapid development of the petroleum industry, all kinds of sewage brought by oil extraction, gas extraction, and drilling have brought great harm to the natural environment and human health. harm. According to statistics in 1998, the water production volume of oilfields across the country reached more than 1.4 million cubic meters per day. Due to the hazards of these sewage, certain treatment and disposal must be carried out before their discharge or reinjection. [0003] Oilfield sewage treatment and recovery play an extremely important role in oil production and environme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/24C02F1/40C02F103/10
Inventor 周宗强刘海浪曾亚勤王亚平周芳德
Owner XI AN JIAOTONG UNIV
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