Method and facility for treating wastewater containing hydrocarbons, in particular aromatic compounds

摘要

The invention relates to a method for treating wastewater containing hydrocarbons, in particular hydrocarbons from the group of compounds referred to as BTEX, comprising benzene, toluene, ethylbenzene and xylene aromatic compounds, said wastewater being in particular from the production or conditioning of natural gas, wherein, according to the method, the wastewater is subjected to stripping by the natural gas such that the hydrocarbon pollution is not only removed from the water by means of being transferred to the gas, but also eliminated during the subsequent combustion of the gas. The wastewater to be treated has a soluble BTEX content that is no higher than 1,200 ppm, preferably no higher than 900 ppm, and the weight ratio of the stripping gas to the treated water is less than 10%, the water being discharged from the stripper having a soluble BTEX content that is no higher than 30 ppm.

主权项

1. A process for treating wastewater containing hydrocarbons from the group of compounds referred to as BTEX, comprising benzene, toluene, ethylbenzene and xylene aromatic compounds, this wastewater originating from the production or conditioning of natural gas, the process comprising subjecting the wastewater to stripping by a combustible gas in a stripper such that the hydrocarbons are removed from the wastewater by transfer into the combustible gas and the combined combustible gas and hydrocarbons are combusted, wherein:
the wastewater entering the stripper has a soluble BTEX content of less than or equal to 1200 ppm, the stripping combustible gas, prior to the stripping, comprises aromatic compounds and has a BTEX content of between 1,000 ppm and 15,000 ppm, and the weight ratio of the stripping combustible gas to the wastewater is less than 10%, and the water which leaves the stripper has a soluble BTEX content of less than or equal to 30 ppm.