Disperse dye contaminated water

Cleanup of Disperse Dye Contaminated Water by Supercritical Carbon Dioxide Extraction... 

Compared with other classes of chemicals, azo d es make a relatively small contribution to the total mass of pollutants released into the environment. However, because they are hi ily coloured, contamination by these chemicals, when it occurs, is readily apparent. Moreover, in locales, where dyes are synthesized and used, thw presence in ground water and surface water may represent important pollution problems. For example, the Coosa River Basin and its tributaries in Northwest Georgia contain approximately 50% of all carpet dyeing wastewater in the United States concentrations of acid azo dyes in Coosa River Basin water samples often being present in the parts per billion to the low psirts per million level [3]. Sediment samples fix>m the same source revealed the presence of several acid azo dyes as well as several disperse azo dyes in the parts per billion to parts per million range [3]. 

In addition to supercritical fluid extraction and supercritical fluid chromatography, supercritical and near-critical fluids are of increasing interest for other applications. These include their use as processing fluids for dyeing of fibers, production of finely dispersed particles (RESS, PGSS, SAS, GAS, etc.), as promising solvents for syntheses and kinetic studies, for the destructive oxidation of wastes with supercritical water (SCWO), for the purification of filters, catalysts, contaminated soils, for drying and sterilization processes, and others [13,19,20]. 

---