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Advanced treatment process for treating complex waste water of super-heavy oil

A technology for advanced treatment and ultra-heavy oil, applied in water/sewage multi-stage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of low pollutant removal rate and small adsorption capacity, etc. Achieve the effect of high pollutant removal rate and reduce the load of biochemical treatment

Inactive Publication Date: 2014-03-12
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

It overcomes the disadvantages of small adsorption capacity and low pollutant removal rate when coal-based activated carbon adsorbent is used in the existing adsorption advanced treatment technology

Method used

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Embodiment Construction

[0015] An advanced treatment process for treating complex super-heavy oil wastewater, the process steps are as follows:

[0016] 1. Cool the complex ultra-heavy oil wastewater after demulsification and physical and chemical pretreatment to 35-40°C;

[0017] 2. Using a combined process of anaerobic treatment and aerobic treatment to biodegrade the cooled wastewater;

[0018] 3. Adsorb the wastewater treated in step 2 with a fresh adsorbent, and control the effluent index COD to be less than or equal to 50mg / L;

[0019] 4. Adsorb the complex super-heavy oil wastewater after demulsification and physical and chemical pretreatment through the unsaturated adsorbent used in step 3;

[0020] 5. Cool the wastewater treated in step 4 to 35-40°C, and then repeat steps 2, 3 and 4;

[0021] 6. Regenerate the used fully saturated adsorbent or use it directly as fuel.

[0022] The above-mentioned adsorbent adopts one or more combinations of lignite activated coke, lignite activated carbon...

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Abstract

The invention relates to the technical field of treatment for sewage of heavy oil of oil fields, in particular to an advanced treatment process for treating complex waste water of super-heavy oil. The process includes steps of firstly, performing demulsification and physico-chemical pretreatment for the complex waste water of the super-heavy oil, and then cooling the complex waste water of the super-heavy oil until the temperature of the complex waste water ranges from 35 DEG C to 40 DEG C; secondly, biologically degrading the cooled waste water by a anaerobic treatment and aerobic treatment combined technology; thirdly, adsorbing the waste water treated in the second step by fresh adsorbents and controlling a COD (chemical oxygen demand) index of yielded water so that the COD index is lower than or equal to 50mg / L; fourthly, adsorbing the complex waste water of the super-heavy oil by the unsaturated adsorbents used in the third step after the complex waste water is subjected to demulsification and physico-chemical pretreatment; and fifthly, cooling the waste water treated in the fourth step until the temperature of the waste water ranges from 35 DEG C to 40 DEG C, and then repeatedly performing the second step, the third step and the fourth step. The advanced treatment process has the advantages of high pollutant removal rate, low service cost and capabilities of reducing biochemical treatment load and increasing adsorbent utilization rate.

Description

Technical field: [0001] The invention relates to the technical field of oilfield heavy oil wastewater treatment, in particular to an advanced treatment process for treating complex super heavy oil wastewater. Background technique: [0002] Complex ultra-heavy oil wastewater is mainly composed of oily wastewater dehydrated and separated from ultra-heavy oil production fluid, steam-assisted gravity flooding (SAGD) wastewater, advanced treatment and reuse of boiler tail water (including scum dehydration, filtered concentrated water, ion exchange wastewater etc.), oil washing pipe water and other waste water, etc., containing a large amount of natural and artificially added various surfactants that are difficult to biodegrade, after degreasing (inverted demulsification) pretreatment, air flotation / flocculation treatment and biological method After treatment, the main control index of effluent COD is still as high as 120mg / L, and further advanced treatment is needed to meet the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/28
Inventor 宋启辉叶正芳仝坤滕济林刘杰吴灏王人成曾魏刘国庆汤琦王国成
Owner BC P INC CHINA NAT PETROLEUM CORP
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