Method for treating acid-containing heavy crude oil refining saline sewage

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
CN104628221AActive Publication Date: 2015-05-20CHINA NAT OFFSHORE OIL CORP +3
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2015-05-20

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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.
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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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