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Heavy crude sewerage jet flow dissolved air flotation process

A technology for dissolved air flotation and heavy oil sewage, which is applied in the direction of flotation water/sewage treatment, etc. It can solve the problems of few applications, poor stability and reliability, etc., and achieve simple process technology, low operating cost and good economy and the effect of social benefits

Inactive Publication Date: 2008-12-24
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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Problems solved by technology

This kind of air flotation method is limited by various conditions, the stability and reliability of the treatment are poor, and there are not many applications.

Method used

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  • Heavy crude sewerage jet flow dissolved air flotation process

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Embodiment

[0021] The invention is applied in the environmental protection sewage treatment plant of Liaohe Oilfield. The sewage treatment plant treats sewage 8000m per day 3 , The original process is divided into primary flotation and secondary flotation. The primary flotation temperature is 70°C, the oil content is high, and the suspended solids are high. When adopting the jet air flotation process provided by the present invention, the reflux ratio is controlled at 50%, the dissolved air ratio is at 10%, and the effluent reaches the biological treatment influent standard (petroleum is less than 30mg / L, suspended solids are below 70mg / L). The water temperature of the secondary flotation is low, close to the atmospheric temperature, the petroleum is relatively low, and the suspended matter is relatively high. When the present invention is adopted, the reflux ratio is controlled at 25%~35%, and the dissolved gas ratio is controlled at 5%~6%. With the joint action of the chemicals, the ...

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Abstract

The invention relates to an air flotation technology for heavy oil sewage injecting dissolve gas comprising a plurality of working procedures of first air flotation, effluent recycle, injecting dissolve gas, uniform cut, second air flotation, slag-scraping and decontamination. The technology of the invention has advantages of simple technique, easy application, low energy consumption, low operation cost, good treatment effect. The organic matters and suspended matters can be effectively removed in the heavy oil sewage using the technology, which can reach the design requirement and obtain good economic and social efficiency.

Description

Technical field: [0001] The invention relates to a process for treating sewage produced from heavy oil and heavy oil fields, which belongs to the category of environmental protection technology. Background technique: [0002] During the development of heavy oil fields, the oil and gas gathering and transportation system usually uses the air flotation method to process the heavy oil produced by the oil well, so as to achieve the purpose of solid-liquid separation. Dissolved air flotation (DAF) is a kind of air flotation method. It uses the characteristics of different solubility of water under different pressures to pressurize and dissolve all or part of the water to be treated (or treated) to increase the air content of the water. Then add coagulant into the water to make the pollutants in the water coagulate and release under normal pressure after flocculation. liquid separation. At present, the dissolved air flotation methods used on site mainly include the following typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/24
Inventor 仝坤周洪山王琦魏新华姜辉于向东杨东辉孔德宁尹冰
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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