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Discharge and standard reaching treatment method for thick oil sewage of oilfields

A sewage treatment method and technology of the treatment method, which are applied in the fields of water/sewage multi-stage treatment, biological water/sewage treatment, oxidized water/sewage treatment, etc. and other problems to achieve the effect of enhancing the treatment effect and reducing the content of petroleum and CODCr

Active Publication Date: 2011-04-27
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The analysis shows that the petroleum in heavy oil sewage is mainly composed of hydrocarbons, phenols, esters, alcohols and ketones, plus various complex chemical ingredients, resulting in the COD of heavy oil sewage Cr High content, poor biodegradability, difficult to be effectively treated by conventional methods

Method used

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  • Discharge and standard reaching treatment method for thick oil sewage of oilfields
  • Discharge and standard reaching treatment method for thick oil sewage of oilfields
  • Discharge and standard reaching treatment method for thick oil sewage of oilfields

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Heavy oil sewage raw water COD Cr It is 680mg / L, and the pH value is 7.8. (1) In the air flotation section, add polyferric sulfate (relative molecular mass 1.4×10 5 ) and PAM, add concentrated sulfuric acid to adjust the pH of the liquid, so that the pH of the acidic liquid is 3.5. After the liquid is mixed with heavy oily sewage, the pH is 5.5. Cr See attached table 1 for the relationship. (2) Add ferric chloride and PAM compounded acidic liquid, the pH value of the acidic liquid is 4.0, and the pH of the liquid is 6.0 after mixing with the heavy oily sewage. Cr See attached table 2 for the relationship.

[0035] Table 1 The amount of air flotation pretreatment agent and COD at pH5.5 Cr Relationship

[0036]

[0037] Table 2 The amount of air flotation pretreatment agent and COD at pH6.0 Cr Relationship

[0038]

Embodiment 2

[0040] According to the polyferric sulfate 200mg / L among the embodiment 1, PAM 200mg / L, add concentrated sulfuric acid to adjust the pH of the medicinal solution. After the preparation of the flotation agent, according to the raw water-air flotation-IB-BACT process of the present invention, the side line test was carried out at the heavy oil sewage treatment station of Liaohe Oilfield.

[0041] Table 3.1 Reaction process conditions of each stage

[0042]

[0043]

[0044] Table 3.2 Petroleum and COD in sideline test of heavy oil sewage Cr Treatment result (mg / L) (1)

[0045]

Embodiment 3

[0047] According to the embodiment 2, each raw water enters the ozone-biologically activated carbon treatment unit after being treated by air flotation-IB-BACT, and the treatment results of each section of the process are shown in attached table 4.

[0048] Table 4 Petroleum and COD in the sideline test of heavy oil sewage Cr Treatment result (mg / L) (2)

[0049]

[0050] Through the treatment method and technique of the present invention above, the petroleum and COD of heavy oil sewage Cr The content reaches below 2mg / L and 50mg / L respectively. It fully meets the requirements of the country and Liaoning Province for sewage discharge. In addition, the method of the invention requires less aeration, effectively reducing power consumption.

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PUM

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Abstract

The invention relates to a method and a process for treating thick oil sewage. The thick oil sewage is treated by adopting the process flows of air flotation pretreatment, biochemical treatment of immobile biology-bio-augmentation and compositive technology (IB-BACT), ozone treatment, bioactive carbon treatment and water discharge, the chemical oxygen demand (CODCr) of the discharged water not only can reach the level 1 discharge standard limit (the CODCr does not exceed 100mg / L) of national sewage comprehensive discharge standards (GB8978-1996), but also can reach the standard limit (the CODCr does not exceed 50mg / L) of local sewage discharge standards (DB21 / 1627-2008) of Liaoning province.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a method and a process flow for the up-to-standard treatment of heavy oil sewage from oilfields. Background technique [0002] At present, the development of heavy oil fields in my country is mainly based on steam injection. Therefore, the oilfield output fluid will contain a large amount of water, which will be processed by ground engineering facilities (combined stations) to produce a large amount of oily oil. sewage. [0003] The composition of oily sewage in heavy oil oilfields is complex. In addition to petroleum, it also contains chemical additives added in the process of oilfield exploitation, various chemical treatment agents added in the ground treatment of the oil-water emulsion produced, oilfield operation sewage, steam Sewage water produced by boiler water system, etc. Chemical agents commonly used in heavy oil production include demulsifiers, drainage aids, viscosity red...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/24C02F3/30C02F1/78C02F1/28C02F3/10
CPCY02W10/10
Inventor 陈进富赵立军张瑞成刘洪达董林
Owner BC P INC CHINA NAT PETROLEUM CORP
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