Biological treatment method for oil extraction waste water with high polymer concentration

A technology for oil extraction wastewater and biological treatment, which is applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Inhibition effect, low maintenance cost effect

Inactive Publication Date: 2012-10-17
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent 201010508722.X, Oilfield Polymer Sewage Treatment Method, introduces a microbial flora that efficiently degrades crude oil, and the effect of treating effluent is stable, but the polymer concentration used in this process is about 500mg / L, for high concentration polymer (800-1500mg / L) The treatment effect of oily sewage is unknown

Method used

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  • Biological treatment method for oil extraction waste water with high polymer concentration
  • Biological treatment method for oil extraction waste water with high polymer concentration
  • Biological treatment method for oil extraction waste water with high polymer concentration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Construction of mixed flora

[0023] Pseudomonas sp.J1, the preservation unit is China Center for Type Culture Collection, the preservation number is CCTCC NO: M 2011473, and the preservation date is December 17, 2011; Bacillus sp.DQ5, the preservation unit is China Typical Culture Collection Center, the preservation number is CCTCC NO: M2010078, and the preservation date is April 15, 2010; Enterobacter sp.DQ11, the preservation unit is China Typical Culture Collection Center, the preservation number is CCTCC NO: M 2010084, and the preservation date is On April 15, 2010 and Bacillus sp.DQ85, the preservation unit is the China Center for Type Culture Collection, the preservation number is CCTCC NO: M 2010083, and the preservation date is April 15, 2010. The following operations are performed:

[0024] (1) Slant culture: inoculate the above-mentioned strains on LB solid slant medium, and culture the bacteria at 30±1°C for 18 to 24 hours;

[0025] (2) First-lev...

Embodiment 2

[0034] Example 2: Treatment of incoming water from an oil production plant in Daqing Oilfield

[0035] Table 1 shows the water quality analysis of an oil production plant in Daqing Oilfield:

[0036] Table 1

[0037] index unit value water temperature ℃ 29-35 pH 7.5-7.8 COD mg / L 950-1700 NH4-N mg / L 3-8 viscosity mPa·S 6.2-6.5 polyacrylamide mg / L 800 suspended matter mg / L 120 oil content mg / L 380

[0038] Process device parameters:

[0039] The dissolved air flotation unit is a dissolved air flotation device and an air pump air flotation device. The model of the dissolved air flotation is DB-HC100 (0.75kW), the parameters are: 2.5×1×2.5m, and the effective volume is 3m 3 , the reflux ratio is 20% (reflux ratio = reflux water volume per unit time ÷ the total water output per unit time), and the hydraulic retention time is 3 hours. The air flotation parameters of the air pump a...

Embodiment 3

[0049] Example 3: Treatment of incoming water from an oil production plant in Xinjiang

[0050] Table 2 shows the water quality analysis of an oil production plant in Xinjiang:

[0051] Table 2

[0052] project unit result oil content mg / L 952.6

[0053] Turbidity NTU 58.31 COD mg / L 1375.6 Ammonia nitrogen mg / L 6.02 Total Phosphorus mg / L 0.175 polyacrylamide mg / L 674 Salinity mg / L 13162.1 Total alkali (HCO 3 - ) mg / L 2625 pH 7.84

[0054] Process device parameters:

[0055] With embodiment 2.

[0056] Process flow:

[0057] With embodiment 2.

[0058] result:

[0059] The test shows that the average oil content of incoming water is 582.7mg / L, the average oil content after air flotation treatment is 159.2mg / L, and the removal rate is 72.6%. After treatment, the average oil content is 13.7mg / L, and the average oil content of sand filtered water is 3.5...

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PUM

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Abstract

The present invention discloses a biological treatment method for oil extraction waste water with high polymer concentration. According to the method, the waste water flows through a dissolved air flotation unit, a biochemical processing unit, and a quartz sand filtering unit, wherein the biochemical processing unit comprises a biochemical pool and aeromicrobe flora with functions of demulsification and degradation of crude oil, and adopts the aeromicrobe flora to degrade polymers in the oil extraction waste water. The method of the present invention has the following advantages that: the investment running cost is low; the crude oil recovery efficiency is high; the maintenance is simple; the treatment time is short; the effluent is stable; the waste water with the high polymer concentration of 800-1500 mg/L can be treated; and the method is suitable for large-scale application.

Description

technical field [0001] The invention relates to a treatment method for high-polymer oil production sewage, in particular to a treatment method for degrading by microorganisms. Background technique [0002] At present, oilfields have begun large-scale polymer flooding oil recovery technology. Since the produced water of polymer flooding contains a large amount of polymers, the chemical composition is complex and the viscosity becomes larger, the treatment difficulty is much greater than that of water flooding produced water. The treatment process adopted by the oil field to treat the wastewater containing polymer mainly adopts the aqw conventional treatment process of "two-stage sedimentation → one-stage filtration". The first stage of settlement is mainly natural settlement and coagulation settlement; the second stage is the filter section, the main processing equipment is quartz sand filter tank or quartz sand magnetite double-layer filter tank, etc. Impurities, emulsified...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10
Inventor 许平盖忠辉蒋立民陶飞
Owner SHANGHAI JIAO TONG UNIV
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