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Condensed oil sewage degradation method for chemical oxygen demand standard

A chemical oxygen demand and heavy oil sewage technology, applied in the field of oil production sewage treatment, can solve the problems of complex COD degradation process, increased treatment cost, high oxidant price, and achieves a solution to COD degradation, reduced production and operation costs, and fast reaction speed. Effect

Inactive Publication Date: 2007-07-11
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of agent has been banned in the United States, Britain, Japan, etc., because once the agent is dissolved in water, it will not decompose for a long time, causing secondary pollution to the surrounding environment and receiving water.
In addition, the price of the oxidant is very high, which increases the high processing cost and affects the profit of the enterprise.
[0003] In addition, some existing heavy oil sewage COD degradation processes are more complicated, and the cost is higher, and the added water treatment agent will also produce secondary pollution. A kind of heavy oil sewage COD degradation method of the present invention has not been reported.

Method used

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  • Condensed oil sewage degradation method for chemical oxygen demand standard

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Effect test

Embodiment 1

[0019] Process flow of the present invention: in Fig. 2-1 and Fig. 2-2

[0020] Take water from the anaerobic tank, add Fenton reagent, mix it through the mixer 2, enter the sand filter 3 sedimentation tank for catalytic oxidation, flocculation reaction and stay for 10 hours, then enter the third-level facultative pond 4 facultative, the residence time of sewage is about 15 days, after being biodegraded by facultative bacteria, enter the secondary artificial wetland, through the mixed action of plant root absorption, microbial degradation and cold-resistant animal digestion, stay for 15-20 days, and then further degrade, then enter the filter tank, add The PH value adjuster is adjusted to 6-9, and the suspended solids are removed and discharged.

Embodiment 2

[0022] Its reaction mechanism is as follows in implementation process among the present invention:

[0023] H added to sewage 2 o 2 Rapidly added Fe 2+ catalytically decomposes into OH with strong oxidation ability, and at the same time Fe 2+ is oxidized to Fe 3+ , some Fe 3+ is reduced to Fe 2+ , continue to catalyze the decomposition of H 2 o 2 , the formation of Fe 3+ It has a strong hydrolysis-polymerization-precipitation tendency with water, and some organic pollutants can be removed by coagulation adsorption during this process.

[0024] Fe 2+ +H 2 o 2 → Fe 3+ +OH - +OH 1.1

[0025] Fe 2+ +OH→Fe 3+ +OH - 1.2

[0026] Fe 3+ +H 2 O → Fe 2+ +HO 2 ·+H + 1.3

[0027] Fe 3+ +HO 2 · → Fe 2+ +O 2 +H + 1.4

[0028] When the reaction reaches 120min, alkane substances, phenolic compounds, polycyclic

[0029] When the reaction reaches 120 minutes, the alkanes, phenolic compounds, and polycyclic aromatic compounds in the water have been co...

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Abstract

The invention discloses a decomposing method of viscous oil effluent chemical oxygen demand, which is characterized by the following: fetching water from anaerobic pond; adding H2O2 solution and FeSO4 solution sequently; blending to react with effluent; making effluent not generate toxic material; dissolving water in the oil acid, alcohol and water; depositing after 2h; forming transparent non-odor oil chemical oxygen demand water to satisfy draining standard.

Description

Technical field: [0001] The invention relates to the treatment technology of oil production sewage, in particular to a method for degrading the chemical oxygen demand of heavy oil sewage. Background technique: [0002] The oil production sewage produced by the super-grade heavy oil production in Liaohe Oilfield is mainly composed of thermal recovery condensed steam and groundwater. Carbonates, etc., also contain many chemical treatment agents added in the oil-water separation process. Among them, the concentration of petroleum and COD is as high as 10000mg / l, BOD 5 Very low value (BOD 5 ≤50mg / l), the specific gravity of mineral oil is close to that of water, and the pre-treatment is difficult. The COD value of the existing process for oil extraction wastewater should be degreasing-oil separation-pressure flotation-first-stage air flotation. At about 350mg / l, and then through the treatment of anaerobic pond-facultative pond-wetland (biological section), after a large cycle...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/28C02F1/72C02F1/52
Inventor 仝坤王琦蒋敬周洪山白玉兴安莹光于向东李明侠石杨
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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