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

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...

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

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