A method for treating salty wastewater from refinery of acidic heavy crude oil

A heavy crude oil and treatment method technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of difficult sewage compliance and achieve the effect of reducing CODcr value

Active Publication Date: 2016-08-10
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Super-heavy oil is also a kind of heavy crude oil with high acid content. Although the above-mentioned patented technology has treated the salty sewage of heavy crude oil with high acid content to a certain extent, the method still has the defect that the sewage is difficult to meet the standard. The patented method The effluent index is still not enough to fully meet the requirements of the first-level discharge standard (CODcr≤60mg / L, petroleum ≤5mg / L, ammonia nitrogen≤10mg / L, total nitrogen≤40mg / L)

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  • A method for treating salty wastewater from refinery of acidic heavy crude oil

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preparation example Construction

[0035] In the present invention, there is no special requirement on the specific type of the heterogeneous catalyst, and various ozone catalytic oxidation catalysts commonly used in the field that can reduce the CODcr value of the water body can be used. In order to further reduce the CODcr value, the heterogeneous catalyst is preferably prepared by mixing amorphous alumina and iron oxyhydroxide powder at a ratio of 100:1 to 30 on a dry basis; through rolling granulation, curing, drying, and roasting. The finished catalyst; The preparation method of described heterogeneous catalyst comprises the following steps:

[0036] (a) uniformly mix amorphous alumina and ferric oxyhydroxide powder;

[0037] (b) Put the mixture obtained in step (a) into the tumbling granulator, spray into the binder for tumbling granulation, the binder is selected from one of water, silica sol, aluminum sol or a mixture thereof, in the form of solution or colloid In the form of atomization spraying, the ...

Embodiment 1

[0071] This example is used to illustrate the treatment method of the present invention for the treatment of salty wastewater from refinery of acid-containing heavy crude oil.

[0072] Put acid-containing heavy crude oil Penglai 19-3 crude oil refinery point source saline sewage into the homogeneous regulating tank 1, and regularly and irregularly discharged point source saline sewage are mixed in the homogeneous regulating tank 1 to achieve homogeneity , the oil content after mixing and homogenizing salty sewage is 732mg / L, CODcr is 4615mg / L, BOD 5 / COD is 0.4, suspended matter SS content is 1233mg / L, ammonia nitrogen content is 78mg / L, and total nitrogen content is 120mg / L; the homogenized saline sewage is gravity settled for 36 hours, so that slick oil, large particle SS and Separating the water body, recovering the slick oil that floats up to the top of the homogeneous regulating tank 1, removing the large particle SS that settled to the bottom of the homogeneous regulatin...

Embodiment 2

[0079] This example is used to illustrate the treatment method of the present invention for the treatment of salty wastewater from refinery of acid-containing heavy crude oil.

[0080] The point source saline sewage from the refining of acidic heavy crude oil Baslow crude oil is collectively input into the homogeneous regulating tank 1, and the regularly and irregularly discharged point source saline sewage is mixed in the homogeneous regulating tank 1 to achieve homogeneity. After the salty sewage is mixed and homogenized, the petroleum content is 943mg / L, CODcr is 5005mg / L, BOD 5 / COD is 0.42, suspended matter SS content is 1564mg / L, ammonia nitrogen content is 78mg / L, and total nitrogen content is 117mg / L; the homogenized saline sewage is gravity settled for 36 hours, so that slick oil, large particle SS and Separating the water body, recovering the slick oil that floats up to the top of the homogeneous regulating tank 1, removing the large particle SS that settled to the b...

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Abstract

The invention discloses a method for treating acid-containing heavy crude oil refining saline sewage. The method comprises the following treatment on the saline sewage: gravity settling oil removal treatment, inclined plate settling oil removal treatment, two-stage air floatation treatment, bio-aeration treatment, anaerobic hydrolysis acidification treatment, nitrification-denitrification treatment and catalytic ozonization treatment. The water body treated by adopting the method can meet the requirements that COD cr is less than or equal to 60mg / L, petroleum is less than or equal to 5mg / L, ammonia nitrogen is less than or equal to 10mg / L and the total nitrogen is less than or equal to 40mg / L.

Description

technical field [0001] The invention belongs to the technical field of oil refinery sewage treatment, and relates to a technology for the standard treatment of heavy crude oil refinery sewage, in particular to a treatment method for acid-containing heavy crude oil refinery salty sewage. Background technique [0002] Acidic heavy crude oil usually refers to acid value greater than 2.0mgKOH / g, and relative density greater than 0.931g / cm 3 of crude oil. In addition to the common characteristics of heavy oils such as low API°, high specific gravity, high carbon residue, and high colloidal asphaltene content, acid-containing heavy crude oil generally also has the characteristics of high sulfur nitrogen, high salt content, and high acid value. Due to the decreasing global conventional oil reserves, the proportion of high-acid heavy crude oil in domestic imported crude oil is getting higher and higher. In domestic newly-built refining and chemical enterprises, heavy crude oil wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 吴青郭宗斌肖立光陈春茂代小丽李海华
Owner CHINA NAT OFFSHORE OIL CORP
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