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Oil refining sewage treatment technology

A technology for treating process and oil refining wastewater, which is applied in the fields of flotation water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. and energy, improve water quality, avoid impact effects

Active Publication Date: 2009-12-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effluent stability of BAF is greatly affected by the influent water quality.

Method used

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  • Oil refining sewage treatment technology

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Effect test

Embodiment 1

[0029] The comprehensive sewage water volume of an oil refinery is about 500t / h, and the COD is about 3000mg / L. It is pumped into the two-stage inclined plate grease trap to remove coarsely dispersed oil-floating particles with large diameters in the sewage, because the oil-floating particles can There is a relative density difference with water, which can be removed by floating to the water surface by natural flotation method, and the oil content of the oil-separated water is reduced to below 400mg / L.

[0030] The oil-separated effluent is pumped to the three-stage dissolved air flotation tank, and 100mg / L polyaluminum chloride and 12mg / L cationic polyacrylamide are added to each stage through the dosing device, and highly dispersed micro-bubbles are used as carriers to adhere to the waste water. Pollutants are removed by floating to the water surface with air bubbles, and the emulsified oil and hydrophobic fine suspended solids in the wastewater are separated. Through the th...

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Abstract

The invention relates to an oil refining sewage treatment technology. Oil refining mixed sewage is sequentially treated by oil removal, air flotation, magnetic separation and biochemical treatment, and then is discharged. On the basis of the original oil refining mixed sewage treatment process flow, the invention adds the step of magnetic separation, which can lighten the load of a secondary bio-chemical treatment device, avoids shock to a biochemical system and greatly improves effluent quality in biochemical treatment. The technology of the invention has the advantages of good treatment effect, wide application range of water quality, stable operation, strong operability, simple flow, small investment, low operation cost, etc.

Description

technical field [0001] The invention belongs to the multi-stage treatment of water, waste water or sewage, and in particular relates to a treatment process for oil refinery mixed sewage including a magnetic separation step. Background technique [0002] With the rapid development of the economy and the rapid increase of the population, the shortage of water resources and the increasingly serious environmental pollution have become an indisputable fact. The calls for industrial enterprises to reuse sewage and improve sewage discharge standards are growing louder. At the same time, with the increasing trend of inferior crude oil and the globalization of crude oil resources, the processing of inferior crude oil by petrochemical enterprises has shown a rapid upward trend, further increasing the difficulty of biochemical treatment of sewage, resulting in a decrease in the efficiency of biochemical treatment equipment, and the effluent may not even meet the standard for a long time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/40C02F1/24C02F1/48
Inventor 李本高秦冰
Owner CHINA PETROLEUM & CHEM CORP
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