Method for treating polymer-containing sewage of oil field

A sewage treatment method and oilfield technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of reducing filtration load, etc., and achieve reduction of filtration load and backwash intensity Small, reduce the loss of filter material

Active Publication Date: 2011-03-30
JIANGSU BODA ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is realized, and the technical scheme concept is to select the microbial joint bacteria for the characteristics of poly-containing sewage, and "degrade and take away" the oil and organic pollutants condensed by the polymer from the polymer, thereby reducing the subsequent filtration load, and the specific pre-treatment Adopt the aerobic treatment of screening and effective compatibility microorganism joint bacteria, thereby overcome the deficiencies in the prior art, realize the object of the present invention

Method used

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  • Method for treating polymer-containing sewage of oil field
  • Method for treating polymer-containing sewage of oil field
  • Method for treating polymer-containing sewage of oil field

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: see Figure 1-4 , the surface of the present invention is used for contact oxidation with fiber silk cloth sheet suspension packing, which is composed of synthetic fiber cloth sheet 2 and fiber silk 1 uniformly distributed on both sides; the combined semi-soft suspension packing is composed of middle plastic clip ring 4 and uniform inner and outer circumference The distributed fiber filaments 3 and 6 form a sheet structure, which is composed of a central rope 5 connected in series. Both have a relatively high density, which is beneficial to increase the contact time between the treated water and the filler and prevent short flow.

Embodiment 2

[0026] Example 2: The treated incoming water is the effluent of the secondary settling tank, and the average water quality index is: oil content 750 mg / l, suspended matter 220 mg / l, polymer 450 mg / l. The process of the present invention is adopted: microbial reaction + primary quartz sand filtration. Wherein the microbial reaction adopts the contact oxidation reaction tank, the filler adopts the semi-soft combined filler of Example 1, the filling rate is 75V / V%, the gas-water ratio is 20:1, and the residence time is 8 hours; the microorganism adopts Bacillus cereus selected from the laboratory (Bacillus cereus), Bacillus megaterium, Bacillus subtilis, Candida lipolytica, Bacillus brevis, Pseudomonas fluorescens mixed bacteria, various bacteria Roughly equal proportions, the treated effluent enters the quartz sand filter after solid-liquid separation, and the final treated effluent contains 2.8mg / l of oil, 4.5mg / l of suspended solids, and a median particle size of 1.32μm. The b...

Embodiment 3

[0027] Example 3: The incoming water is also the effluent of the secondary settling tank, the average water quality index: oil content 750mg / l, suspended matter 220mg / l, polymer 450mg / l. The process of the present invention is adopted: microbial reaction + primary quartz sand filtration. Wherein the microbial reaction adopts the activated sludge method, the air-water ratio is 30:1, the sludge concentration is 8000mg / l, and the residence time is 13 hours. , the average oil content of the treated water is 3.2mg / l, the suspended solids are 4.8mg / l, the median particle size is 1.35μm, the backwashing cycle of the filter tank is once every 10 days, and the sludge oil content is less than 0.3wt%, which meets the environmental protection discharge requirements. The filter tank backwash water returns to the microbial reaction tank without additional treatment.

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Abstract

The invention relates to the improvement of a method for treating polymer-containing sewage of an oil field. The method is characterized in that microorganisms are formed by mixing bacillus cereuses, bacillus megateria, bacillus subtilis, candida lipolytica, bacillus brevis and pseudomonas fluorescens; after microorganism aerobic degradation, post filter treatment is carried out; obligate microorganisms are used for degrading oil and organic pollutants bonded on polymers, thereby improving the separability of surplus inorganic substances and polymer-containing substances; and meanwhile, the degradation of the oil and the organic pollutants creates a condition for subsequently prolonging the filter period of a filter material. The invention has the advantages of simple process, simplified flows, convenient running and management, good treatment effect, low treatment and running cost (0.65-0.7yuen / ton of water, which is 2 / 3 of that of conventional treatment), no need of adding any drug,no treatment secondary pollution and stable treatment effect, can guarantee that treated yield water can stably reach 5.5.2, has small sludge quantity and does not need a sludge treatment system, thereby solving the treatment problem of polymer-containing sewage of an oil field.

Description

technical field [0001] The invention relates to the improvement of the treatment method for the poly-containing sewage produced in the oil field, in particular to a treatment method using obligate microorganisms combined with filtration. Background technique [0002] With the continuous development of medium and high permeability oilfields, in order to improve oil recovery, the tertiary oil recovery technology of adding polymers (such as polyacrylamide) is widely used in medium and high permeability oilfields, so that the produced water in the oilfield has not only the quality of the produced water in the general oilfield In addition to the characteristics, it also has: ① High polymer concentration, the initial polymer concentration is generally 100-200mg / l, and then continuously increased to about 1500mg / l; ② Viscosity increases, generally the viscosity of water flooding produced water is 0.6mpa.s , while the viscosity of polymer-containing sewage is 0.8-6mpa.s, or even hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 王娅娜王海君
Owner JIANGSU BODA ENVIRONMENTAL PROTECTION
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