Procedure for processing wastewater containing aromatic nitro compounds

Procedure for processing alkaline wastewater generated in gross denitrobenceno washing, wherein nitrobenzene crude) is produced by adiabatic nitration of benzene with nitrating acid, and then b) is washed with an acid wash, and then c ) is washed with an alkaline wash to give an alkaline wastewater containing benzene aconcentraciones from 100 to 3,000 ppm and nitrobenzene at concentrations of 1,000 to 10,000 ppm, characterized in that d) then the undissolved benzene and / or nitrobenzene presents separates alkaline wastewater laetapa c), e) then benzene and / or residual nitrobenzene alkaline waste water porarrastre step d) is removed, f) then heated to temperatures of 150 to 500 ° c at overpressure alkaline wastewater the etapad) or e) with exclusion of oxygen.