Combined treatment method of oil-refining wastewater containing naphthenic acid

A treatment method and technology for oil refining sewage, which are applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., which can solve the problems of frequent replacement, unremoved pollutants, and high operating costs.
CN102923913AActive Publication Date: 2013-02-13CHINA NAT OFFSHORE OIL CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2013-02-13

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Abstract

The invention relates to a combined treatment method of oil-refining wastewater containing naphthenic acid. The combined treatment method of the oil-refining wastewater containing naphthenic acid is characterized in that a pre-treatment technology is added at the front end of an 'anoxic / oxic' ('A / O') step of an oil removing + A / O process, and an advanced treatment process is added at the back end of the 'A / O' step. Air-floatation oil removing effluent enters a modified biological aerated filter to be pre-treated, a filler is subjected to modification treatment, and the combined treatment method adopts upstream continuous operation. Hydraulic loading is controlled in a range of 1.0-3.0 m<3> / m<2>-h, the temperature is controlled in a range of 25-35 DEG C, the reflux ratio is controlled to be 100-150%, the gas-water ratio is controlled to be 3:1-5:1, and an automatic back washing period is controlled to be 48-72 hours. The effluent of the modified biological aerated filter is subjected to treatment of an 'A / O' biochemical system, enters an intermediate reaction tank and then enters a pre-mixing tower in parallel. The effluent of the pre-mixing tower enters a catalytic oxidation tower to quickly oxidize difficultly-biodegradable organic matter in sewage and reduce chemical oxygen demand (COD) of the sewage, and finally treated effluent enters a clean water pond.
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Description

technical field

[0001] The invention relates to the technical field of industrial water treatment, and relates to a combined treatment method for oil refinery sewage containing naphthenic acid. Background technique

[0002] At present, some refineries in China are producing and processing heavy crude oil, and their sewage water quality is complex, mainly containing refractory organic pollutants such as naphthenic acid and high dissolved solids (generally 3000-5000 mg / L). After "oil removal + A / O" treatment, CODcr is 200mg / L, BOD 5 It is 5mg / L (B / C is only 0.025, which is extremely difficult to biodegrade wastewater), which is far higher than the national first-class A discharge standard. In order to meet the increasingly stringent discharge or reuse requirements, some enterprises use activated carbon adsorption and other methods for advanced treatment. Although the treated effluent can meet the discharge standard, the activated carbon is easily saturated, and the pollutants...

Claims

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