Ozone contact oxidation tank and refinery wastewater advanced treatment method thereof

A technology for ozone contact oxidation and oil refining wastewater, which is applied in the field of water treatment, can solve the problems of reducing the efficiency of ozone oxidation of refractory organic matter, the treatment effect of refractory COD is not obvious, and the biodegradability of wastewater is not improved, so as to avoid the increase of SS in the effluent. , to avoid short flow of water and improve the effect of operation

Active Publication Date: 2015-02-25
南京智仁环保科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The ozone oxidation equipment used in this process is a single plexiglass column of Φ190 mm×950 mm. Although the COD removal rate of wastewater treated by this process reaches 96%, this process does not add filtration or filtration between the secondary biochemical effluent and ozone oxidation. The air flotation device leads to higher SS entering the ozone oxidation section, and because the ozone oxidation is not targeted, suspended particulate matter (SS) will react with ozone in preference to refractory organic matter in water, thereby reducing the efficiency of ozone oxidation of refractory organic matter...

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  • Ozone contact oxidation tank and refinery wastewater advanced treatment method thereof
  • Ozone contact oxidation tank and refinery wastewater advanced treatment method thereof

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Embodiment 1

[0034] Such as figure 2 , a refinery 300m 3 / h Refinery wastewater undergoes grit settling→regulation→oil separation→primary and secondary flotation→activated sludge process→secondary sedimentation tank after conventional treatment, and the effluent is the refinery wastewater after secondary biochemical treatment, generally called secondary Biochemical effluent, the water quality index is COD120mg / L, BOD 5 20mg / L, suspended matter SS150mg / L.

[0035] Use sand filter to filter the above-mentioned secondary biochemical effluent, the effective volume of the sand filter is 204m 3 ,Add Φ0.5~1.0mm, Φ1.0~2.0mm and Φ2.0~4.0mm quartz sand filter materials (commercially available) in the filter from top to bottom, the hydraulic retention time is 40min, and the average filtration rate is 7.5 m / h. More than 80% of SS in the secondary biochemical effluent can be removed by quartz sand filtration to ensure that the SS in the ozone oxidation tank does not exceed 30mg / L, so as to avoid t...

Embodiment 2

[0040] The volume of refinery wastewater in a petrochemical refinery is 650m 3 / h, using adjustment-oil separation-vortex concave air flotation-dissolved air flotation-activated sludge treatment, the treated effluent COD is 106mg / L, BOD 5 It is 19mg / L, and SS is 120mg / L. Adopt the various steps and methods mentioned in the content of this recipe in turn, and carry out filtration pretreatment with a sand filter. The hydraulic retention time of the sand filter is 30 minutes, the backwash time period is 48 hours, and the SS after treatment is 22mg / L. The effluent from the sand filter enters the ozone contact oxidation tank. Under the catalytic action of the catalyst, the hydroxyl radicals generated by the decomposition of the ozone will produce intermediate products such as acetic acid and propionic acid from the refractory pollutants. The dosage of the catalyst ferrous sulfate is 3mg / L, Suspended filler is added to the ozone contact oxidation tank to increase the gas-liquid co...

Embodiment 3

[0043] The volume of refinery wastewater in a petrochemical refinery is 400m 3 / h, adopt grit settling→adjustment→oil separation→primary and secondary flotation→oxidation ditch→secondary settling tank for conventional treatment, the COD of the treated secondary effluent is 98mg / L, BOD 5 It is 14mg / L, and SS is 137mg / L. Adopt the steps and methods mentioned in the content part of this recipe successively, and carry out filtration pretreatment with a sand filter, the hydraulic retention time of the sand filter is 45min, and the SS after treatment is 30mg / L. The effluent from the sand filter enters the ozone contact oxidation tank. Under the catalytic action of the catalyst, the hydroxyl radicals generated by the decomposition of the ozone will produce intermediate products such as acetic acid and propionic acid from the refractory pollutants. The dosage of the catalyst ferrous sulfate is 2mg / L, Suspended filler is added to the ozone contact oxidation tank to increase the gas-l...

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Abstract

The invention discloses an ozone contact oxidation tank and an advanced treatment refinery wastewater method thereof. Aromatic compounds are decomposed into micromolecule aliphatic hydrocarbons by ozone under the catalytic action of a catalyst, and the COD (chemical oxygen demand) content in the wastewater is lowered under the biodegradation action of a BAF (biological aerated filter); and meanwhile, the unique adsorption filtration action of the BAF can effectively lower the SS (suspended sediment), thereby forming stable effluent water quality. The unique three-chamber structure of the ozone contact oxidation tank greatly enhances the ozone-wastewater mixing effect, and improves the oxidation action of ozone on the pollutants; and the effluent water partition is arranged to avoid the shortage of effluent water and prevent the oxidized effluent water from carrying ozone to enter the biochemical unit so as to generate adverse effects on the biochemical bacteria, thereby enhancing the operation effect of the whole technique and saving the operating cost.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to an ozone contact oxidation pool and a method for advanced treatment of oil refinery wastewater. Background technique [0002] Refining wastewater mainly refers to the wastewater generated in the production process of direct distillation of crude oil, cracking and distillation of heavy oil, and refining of certain fractions. Due to the different sources of refined crude oil and refining procedures, the pollutants in refinery wastewater are complex. In addition to general pollutants, there are oils, phenols, sulfides, ammonia nitrogen, aromatic compounds, etc. The chemical oxygen demand ( COD) content is high, there are many aromatic compounds that are difficult to biodegrade, and the treatment is more complicated. [0003] At present, with the increasingly prominent contradiction between my country's rapid economic development and environmental protection, the country and l...

Claims

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Application Information

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IPC IPC(8): C02F1/78C02F9/14
CPCC02F1/725C02F1/78C02F3/02C02F9/00C02F2103/365C02F2301/08
Inventor 梁晶
Owner 南京智仁环保科技有限公司
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