Combined method for treating refinery wastewater by adopting reverse osmosis and catalytic ozonation

A technology for ozone catalytic oxidation and oil refinery wastewater, applied in the direction of oxidation water/sewage treatment, permeation/dialysis water/sewage treatment, chemical instruments and methods, etc., can solve the problem of difficult discharge standards, poor biochemical properties, and incomplete removal of pollutants And other issues

Inactive Publication Date: 2011-08-17
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Currently, coagulation filtration, advanced oxidation and biological aerated filter are mostly used in the advanced treatment and reuse of wastewater from oil refineries. However, these technologies have shortcomings such as incomplete removal of pollutants and no removal rate of total dissolved solids. When the effluent is reused as circulating cooling water, it is prone to scaling and corrosion
The reverse osmosis process has a good removal effect on pollutants and total dissolved solids. However, while preparing pure reuse water, this process also produces reverse osmosis concentrated water with a high concentration of pollutants, accounting for about 10% of the total water volume. 25%, these wastewaters mainly contain refractory pollutants such as xylene and naphthenic acid, and also contain high dissolved solids, which have an inhibitory effect on the biochemical system. Traditional biochemical and other treatment processes are difficult to make them discharge up to standard
For example, in the treatment of oil refinery wastewater, the CODcr of concentrated water produced by the reverse osmosis process is about 200mg / L, the oil is about 10mg / L, the higher total dissolved solids (usually the total dissolved solids are greater than 5000mg / L) and poor The biodegradability of this type of wastewater makes it extremely difficult to treat

Method used

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  • Combined method for treating refinery wastewater by adopting reverse osmosis and catalytic ozonation
  • Combined method for treating refinery wastewater by adopting reverse osmosis and catalytic ozonation

Examples

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Effect test

Embodiment 1

[0011] An oil refinery in Zhejiang, daily treatment of refining wastewater 1200m 3 , in order to realize sewage reuse, adopt reverse osmosis of the present invention and ozone catalytic oxidation advanced treatment oil refinery wastewater combined process method, carried out pilot test research on the spot, specific implementation process is as attached figure 1 : The ultrafiltration product water enters the reverse osmosis membrane 2 through the high-pressure pump 1, and the produced water is reused in the production process. The tank is fully mixed and reacted with the ozone provided by the ozone generator 4 , the effluent enters the catalytic oxidation reaction tower 8 through the lift pump 7 , and the effluent flows into the clear water pool 9 . The tail gas discharged from the pre-aeration tank 6 and the catalytic oxidation reaction tower 8 enters the tail gas purifier 10, and the purified gas is discharged.

[0012] When the operating pressure difference of the reverse ...

Embodiment 2

[0014] A refinery in Tianjin treats 1800m of refinery waste water per day 3 , in order to realize sewage reuse, adopt reverse osmosis of the present invention and ozone catalytic oxidation advanced treatment refinery waste water combined process method to carry out small-scale experimental research on the spot, implementation process is the same as embodiment one: when reverse osmosis membrane 2 operating differential pressure is controlled at At 0.9MPa, reverse osmosis influent CODcr45~52mg / L, conductivity 3350~3620us / cm, petroleum 1.3~2.0mg / L, after reverse osmosis treatment, reverse osmosis product water CODcr0mg / L, conductivity 138~156us / cm, petroleum 0mg / L. Reverse osmosis concentrated water COD180~210mg / L, petroleum 5.2~7.4mg / L, when the ozone dosage in the water is 10~15mg / L, the mixing reaction time in the pre-aeration tank 6 is controlled at 15~20min, and the catalytic oxidation reaction The air speed of tower 8 is controlled at 3.0~3.5h -1 When treated by the ozon...

Embodiment 3

[0016] A refinery in Heilongjiang treats 3000m of refinery waste water per day 3 , in order to realize the reuse of sewage, the combination process of reverse osmosis and ozone catalytic oxidation advanced treatment of oil refinery wastewater of the present invention was carried out in a small test on site. The implementation process is the same as that of Example 1: when the operating pressure difference of the reverse osmosis membrane 2 is controlled at 0.9MPa, the reverse osmosis influent CODcr32~42mg / L, conductivity 2650~2930us / cm, petroleum 0.8~1.5mg / L, after reverse osmosis After osmosis treatment, reverse osmosis produced water CODcr0mg / L, conductivity 89-106us / cm, petroleum 0mg / L. Reverse osmosis concentrated water COD 130-170mg / L, petroleum 2.8-4.2mg / L, when the amount of ozone in the water is 5-10mg / L, the mixing reaction time in the pre-aeration tank 6 is controlled at 20-30min, catalytic oxidation The space velocity of reaction tower 8 is controlled at 2.0~2.5h -...

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Abstract

The invention provides a combined method for treating refinery wastewater by adopting reverse osmosis and catalytic ozonation. The method is characterized in that the reverse osmosis process is firstly adopted to treat the refinery wastewater to ensure the produced water to achieve the reuse standard and then the reverse osmosis concentrated water is subjected to deep treatment by adopting the catalytic ozonation process and is discharged after reaching the standard; the specific process flows are as follows: the ultra-filtrated produced water enters into a reverse osmosis membrane (2) through a high pressure pump (1) and is reused in the production process; the discharged reverse osmosis concentrated water enters into a regulating tank (3) to be regulated and then enters into a preaeration tank (6) through a water supply pump (5); the water is fully mixed with and reacts with ozone provided by an ozone generator (4) in the tank; the effluent enters into a catalytic oxidation reaction tower (8) through a lift pump (7) and flows into a clear water tank (9); and the tail gases discharged from the preaeration tank (6) and the catalytic oxidation reaction tower (8) enter into a tail gas purifier (10) and the purified gases are discharged.

Description

technical field [0001] The invention relates to oil refinery wastewater treatment technology, which is a combined method for treating oil refinery wastewater by reverse osmosis and ozone catalytic oxidation. Background technique [0002] Currently, coagulation filtration, advanced oxidation and biological aerated filter are mostly used in the advanced treatment and reuse of wastewater from oil refineries. However, these technologies have shortcomings such as incomplete removal of pollutants and no removal rate of total dissolved solids. The effluent is prone to fouling and corrosion when it is reused as circulating cooling water. The reverse osmosis process has a good removal effect on pollutants and total dissolved solids. However, while preparing pure reuse water, this process also produces reverse osmosis concentrated water with a high concentration of pollutants, accounting for about 10% of the total water volume. 25%. These wastewaters mainly contain refractory polluta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78C02F9/04C02F1/44
Inventor 滕厚开李亮阮晓磊郑书忠张艳芳陈军马元威
Owner CHINA NAT OFFSHORE OIL CORP
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