Efficient biological treatment method for polymer-containing sewage in oil field

A biological treatment and sewage technology, applied in sustainable biological treatment, biological water/sewage treatment, flotation water/sewage treatment, etc., can solve problems such as failure to meet environmental protection requirements, unstable process operation, poor biodegradability, etc., to achieve Small investment, easy handling, and the effect of alleviating corrosion problems

Inactive Publication Date: 2010-07-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims to solve the problems of poor biodegradability, difficult treatment, large investment, unstable process operation, and inability to meet environmental

Method used

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  • Efficient biological treatment method for polymer-containing sewage in oil field

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specific Embodiment approach 1

[0013] Specific embodiment one: the efficient biological treatment method of oil field poly-containing sewage in this embodiment is realized according to the following steps: 1. After the oil field poly-contained sewage is treated by air flotation process, the sewage produced adopts anaerobic process to carry out bio-augmentation, and the hydraulic retention time is 24 to 36 hours; 2. The effluent produced by the anaerobic process is strengthened by the aerobic process, and the hydraulic retention time is 10 to 14 hours, and then the effluent enters the filtration system, and the hydraulic retention time is 5 to 8 hours; 3. Filtration The effluent produced by the system enters the secondary sedimentation tank, and the hydraulic retention time is 5 to 6 hours, which means that the efficient biological treatment of the oilfield wastewater containing polymers is completed.

[0014] In step 1 of this embodiment, the oilfield wastewater containing polyacrylamide refers to the oilfie...

specific Embodiment approach 2

[0018] Specific embodiment two: this embodiment differs from specific embodiment one in that the anaerobic process in step one is UASB (upflow anaerobic sludge bed), SBR (sequenced batch activated sludge process) or EGSB (expanded granular sludge mud bed). Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0019] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the anaerobic process needs to add anaerobic biological bacteria agent in step one, and the anaerobic biological bacteria agent is anaerobic polyacrylamide degradation functional flora and anaerobic petroleum Degrading bacteria, the dosage accounts for 1% to 5% of the volume of effective sewage in the reaction tank. Other steps and parameters are the same as those in Embodiment 1.

[0020] In this embodiment, the anaerobic polyacrylamide degrading functional flora degrades high-molecular-weight water-soluble polyacrylamide into low-molecular-weight compounds, and then converts them into carbon and nitrogen sources needed for microbial metabolism to achieve microbial biodegradation; Oxypolyacrylamide-degrading functional bacteria were screened from polymer injection process wastewater and polymer-containing wastewater by conventional methods.

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Abstract

The invention discloses an efficient biological treatment method for polymer-containing sewage in an oil field and relates to a treatment method for the polymer-containing sewage. The invention solves the problems in the existing polymer-containing sewage in the oil field that the biochemical property of the sewage is pool, the treatment is difficult, the investment is big, the process operation is unstable, and the environmental requirement can not met. In the method, 1, after the polymer-containing sewage is treated by the air flotation process, the produced sewage is intensified biologically by adopting the anaerobic process; 2, the effluent produced by the anaerobic process is intensified by adopting the aerobic process, and the intensified effluent enters a filter system; 3, the effluent produced by the filter system enters a secondary sedimentation tank, namely, the efficient biological treatment for the polymer-containing sewage in the oil field is finished. The method realizes the biological treatment for the polymer-containing sewage, the biochemical property of the contained polyacrylamide is good, and the whole process can realize that the treatment for the polymer-containing sewage is stable, the treatment is easy, the investment is small, no secondary pollution is caused, and the environmental requirement is met.

Description

technical field [0001] The invention relates to a treatment method for poly-containing sewage. Background technique [0002] With the wide application of tertiary oil recovery technology, polymer flooding technology has become one of the main technical means to enhance oil recovery. Water-soluble polymers have been widely used in various aspects of the oilfield industry. Reinjection of wastewater containing polymers is difficult and costly. If cascading occurs, it will have a catastrophic impact on oilfield production or groundwater resources, and at the same time affect the surrounding environment. cause serious harm. Polymerized sewage is a relatively complex and special kind of sewage, and conventional sewage treatment methods generally have unsatisfactory effects on this kind of sewage. Therefore, it has become a top priority to treat oilfield wastewater containing aggregates and meet the standards for discharge. [0003] In recent years, partially water-soluble high ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/24C02F3/28C02F3/02C02F1/52C02F3/34C02F3/30C02F3/10C02F103/10C02F101/34C02F101/38
CPCY02W10/10
Inventor 魏利赵立军李春颖张洪军陈忠喜
Owner HARBIN INST OF TECH
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