STUDY OF THE ADVANCED OXIDATION PROCESSES OF CHLOROBENZENES IN WATER

The focus of this study was to investigate the use of advanced oxidati on processes to oxidize a residual water in which chlorobenzenes were found in the range of 1 mg/L to 10 mg/L and whose TOC was about 1,000 mg/L, and a solution of chlorobenzenes whose concentration was 0.03 mg /L, which was prepared from stock solutions. Ozone in basic medium (pH = 9) and ozone in the presence of hydrogen peroxide (H2O2) were compa red. The carbonyl ozonation byproducts (Glaze, 1989) have been identif ied as PFBOA [O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine] derivativ es by gas chromatography/mass spectrometry (GC/MS). A quantitative ana lysis by GC/ECD (gas chromatograph equipped with an Electron Capture D etector) and by GC/FID (Flame Ionization Detector) was carried out on the complete series of chlorobenzenes in order to determine the elimin ation levels reached after treatment with ozone and ozone/hydrogen per oxide. 2-Chlorophenol and 4-chlorophenol were identified as first oxid ation byproducts of chlorobenzene.