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Treatment method for waste water from processing acid-containing crude oil

A treatment method and oil treatment technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of foaming, acid-containing crude oil wastewater not meeting the standard biochemical treatment, etc. To achieve the effect of solving more bubbles

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can make the treatment process of other waste water in the processing of acid-containing crude oil, such as oily waste water and salty waste water, no longer affected by naphthenic acid, and has great impact on the oil separation, flotation, biochemical and advanced treatment of the final sewage treatment plant. The stable operation of the unit brings benefits, which solves the problems that the current processing of acid-containing crude oil wastewater cannot meet the standards and the foaming of biochemical treatment, and provides a good foundation for wastewater reuse

Method used

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Experimental program
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Effect test

Embodiment 1

[0034] The treatment method of the invention is used to treat the waste water discharged from the electric desalination device. The main pollutants in mixed wastewater are COD 2800 mg / L (chromium method, the same below), petroleum 600 mg / L, ammonia nitrogen 90 mg / L, volatile phenol 50 mg / L, sulfide 17.0 mg / L, naphthenic acid 480 mg / L, pH 8.5.

[0035] Using the combination process of demulsification-cyclone degreasing-dissolved air flotation-ozone oxidation-MBBR-filtration of the present invention to carry out laboratory treatment tests on the above wastewater, the wastewater treatment scale is 200mL / h, and the main experimental devices of each treatment unit constitute , Operating conditions and treatment effects are shown in Table 1.

[0036] Table 1 Main processing unit composition and processing effect of Embodiment 1

[0037]

[0038] After being treated by the method of the present invention, the COD in the mixed naphthenic acid-containing wastewater can be reduced ...

Embodiment 2

[0040] Using the treatment device of Example 1 to treat the same sewage as in Example 1, the wastewater treatment effects obtained by changing the operating conditions of each treatment unit are shown in Table 2, respectively.

[0041] Table 2 Main processing unit composition and processing effect of embodiment 2

[0042]

[0043] After being treated by the method of the present invention, the COD in the mixed naphthenic acid-containing wastewater can be reduced to below 100 mg / L, the petroleum can be reduced to below 0.5 mg / L, and the naphthenic acid is ≤10 mg / L, which can meet the discharge standard of sewage Require.

Embodiment 3

[0045] The treatment device of Example 1 was used to treat the same sewage as in Example 1, and the wastewater treatment effects obtained by changing the operating conditions of each treatment unit are shown in Table 3.

[0046] Table 3 Main processing unit composition and processing effect of embodiment 3

[0047]

[0048] After being treated by the method of the present invention, the COD in the mixed naphthenic acid-containing wastewater can be reduced to below 100 mg / L, the petroleum can be reduced to below 0.5 mg / L, the ammonia nitrogen can be reduced to below 15 mg / L, and the sulfides and volatile phenols can be reduced respectively. To below 0.5mg / L, naphthenic acid ≤10mg / L, which can meet the index requirements of sewage discharge standards.

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Abstract

The invention relates to a treatment method for waste water from processing acid-containing crude oil, and the method is used in the treatment of waste water containing naphthenic acid from the refining process of acid-containing crude oil. The method adopts a combined process including demulsification, cyclone oil removal, dissolved air flotation, ozone oxidation, MBBR and filtering to treat the wastewater containing naphthenic acid discharged from an electric desalting device in the crude oil refining process, and the outlet water after treatment reaches discharge standards. The method can prevent the treatment process of other waste water, such as oil-containing sewage and salt-containing waste water from the influence from naphthenic acid, and benefit the stable operation of oil separation, flotation, biochemical treatment and depth treatment units in final sewage works, so as to solve the problems of unqualified waste water from processing acid-containing crude oil and foaming of biochemical treatment, and provide a good basis for waste water reuse.

Description

technical field [0001] The invention relates to a treatment method for processing acid-containing crude oil wastewater, which is suitable for the treatment of naphthenic acid-containing wastewater discharged from an electric desalting device in the refining process of acid-containing crude oil. Background technique [0002] With the continuous development and utilization of crude oil, the output of heavy crude oil is increasing, and its density, viscosity, sulfur content, and acid value increase accordingly. According to preliminary statistics on the crude oil market in recent years, the global output of acid-containing crude oil (acid value ≥ 0.5 mgKOH / g) has accounted for 5.5% of the total development volume, and is increasing at an average annual rate of 0.3%. Due to the increasing shortage of crude oil resources and the obvious price advantage of sour crude oil, the centralized or large-scale processing of sour crude oil has become the development trend of refining and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 郭宏山陈中涛张蕾李建涛许莹
Owner CHINA PETROLEUM & CHEM CORP
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