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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.

Active Publication Date: 2013-02-13
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 are only transferred but not removed. Secondary pollution solid pollutants are produced when activated carbon is replaced, and the replacement is frequent and the operating cost is high. In order to solve this outstanding problem, it is urgent to develop a treatment method for oil refinery wastewater containing naphthenic acid with stable treatment effect

Method used

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  • Combined treatment method of oil-refining wastewater containing naphthenic acid
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  • Combined treatment method of oil-refining wastewater containing naphthenic acid

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Experimental program
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Effect test

Embodiment 1

[0016] According to the above process, a certain oil refinery is used for sewage treatment, and the reaction conditions are as follows: the modified biological aerated filter adopts upstream continuous operation, the filler is selected volcanic rock modified by sulfuric acid, and the hydraulic load is 2.0m 3 / m 2 h, the average temperature is 30°C, the reflux ratio is 120%, the air-water ratio is 4:1, and the automatic backwash cycle is 48h. Modified alumina is selected as the carrier of the catalyst, loaded with active metal oxides of 3.0% copper and 2.0% manganese, the reaction time of the single-stage premixed tower is 30min, the dosage of single-stage ozone is 30mg / L, and the single-stage catalytic The oxidation tower reaction time is 20min, and the results are shown in Table 1:

[0017] Table 1 Treated effluent water quality

[0018]

Embodiment 2

[0020] According to the above process, a certain oil refinery is used for sewage treatment, and the reaction conditions are as follows: the modified biological aerated filter adopts upstream continuous operation, the filler is selected from fly ash modified by sulfuric acid, and the hydraulic load is 3.0m 3 / m 2 h, the average temperature is 25°C, the reflux ratio is 100%, the air-water ratio is 3:1, and the automatic backwash cycle is 72h. Granular activated carbon is used as the catalyst carrier, loaded with active metal oxides of 4.0% iron and 2.5% nickel, the reaction time of the single-stage premixed tower is 45min, the dosage of single-stage ozone is 25mg / L, and the single-stage catalytic oxidation tower The reaction time is 15min, and the results are shown in Table 2:

[0021] Table 2 Treated effluent water quality

[0022]

Embodiment 3

[0024] According to the above process, a certain oil refinery is used for sewage treatment, and the reaction conditions are as follows: the modified biological aerated filter adopts upstream continuous operation, the filler is zeolite modified by hydrochloric acid, and the hydraulic load is 1.0m 3 / m 2 h, the average temperature is 35°C, the reflux ratio is 150%, the air-water ratio is 5:1, and the automatic backwash cycle is 60h. Fly ash is used as the carrier of the catalyst, loaded with active metal oxides of 2.0% copper, 3.0% iron and 5.0% manganese, the reaction time of the single-stage premixed tower is 60min, and the dosage of single-stage ozone is 35mg / L. The reaction time of the single-stage catalytic oxidation tower is 20 minutes, and the results are shown in Table 3:

[0025] Table 3 Treated effluent water quality

[0026]

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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.

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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Application Information

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IPC IPC(8): C02F9/14C02F101/34
Inventor 刘红光吴青滕厚开肖立光张艳芳郭宗斌李亮徐辉军阮晓磊
Owner CHINA NAT OFFSHORE OIL CORP
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