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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  • 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 c

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

Example Embodiment

[0033] Example 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 polymeric ferric sulfate (relative molecular mass 1.4×10 5 ) And PAM compounded acid liquid, add concentrated sulfuric acid to adjust the pH of the liquid, so that the pH of the acid liquid is 3.5. After the liquid is mixed with the heavy oil sewage, the pH is 5.5, the dosage ratio of the medicine and COD Cr See attached table 1 for the relationship. (2) Adding an acidic chemical solution made of ferric chloride and PAM, the pH of the acidic chemical solution is 4.0, the pH of the chemical solution is 6.0 after mixing with the heavy oil sewage, the dosage ratio of the chemical is combined with COD Cr See attached table 2 for the relationship.

[0035] Table 1 Addition of air flotation pretreatment agent and COD at pH 5.5 Cr Relationship

[0036]

[0037] Table 2 Addition of air flotation pretreatment agent and COD at pH 6.0 Cr Relationship

[0038]...

Example Embodiment

[0039] Example 2:

[0040] According to Example 1, polymerized ferric sulfate 200mg / L, PAM 200mg / L, add concentrated sulfuric acid to adjust the pH of the liquid. After the preparation of the flotation agent, the raw water-air flotation-IB-BACT process of the present invention is used for sideline test at the heavy oil sewage treatment station of Liaohe Oilfield. The process conditions and treatment results of each stage of the process are shown in the attached tables 3.1 and 3.2.

[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]

Example Embodiment

[0046] Example 3:

[0047] According to Example 2, each raw water is treated by air flotation-IB-BACT and then enters the ozone-biological activated carbon treatment unit. The treatment results of each stage of the process are shown in Table 4.

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

[0049]

[0050] Through the above treatment method and process of the present invention, the petroleum and COD of heavy oil sewage Cr The content reached 2mg / L and below 50mg / L respectively. Fully meet the requirements of the country and Liaoning Province for sewage discharge. In addition, the method of the present invention reduces the requirement for aeration volume, effectively reducing power consumption.

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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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