Jornal de Ciência e Tecnologia de Membranas

Abstrato

Treatment of Textile Industry Wastewater by Sequential Hybrid Processes Photo-Fenton, Ultrafiltration (UF), Reverse Osmosis (RO) and Recovery of some Dyes, Salt and Perfluoroalkyl Sulfonate from the Retentate

Delia Teresa Sponza

Textile industry waste water should be treated by best available and economical hybrid treatment techniques (BAT) to achieve the discharge limits (ELV) set by European Union, and reuse them as process or irrigation waters. Recovery of some valuable materials/chemicals and reuse of treated waste water is a European Union Directive (European Commission). When the industrial wastewaters are not treated by the best available techniques, it is not possible to reuse the water and recover some valuable chemicals. Therefore, in this study a sequential photo-Fenton/UF/RO process was used to treat the COD, COD-dis, DOC, colour salt and reuse of treated textile wastewater and recovery of some economical merits from the retentate of the RO (dyes, salt and perfluoroalkyl sulfonate). The photo-Fenton experiments were carried out in a cylindrical pyrex thermostatic module with a volume of 2,5 L, 1,8 L textile wastewater and 2 mg/l, 6 mg/l, 12 mg/l Fenton was stirred with a magnetic bar. Five 25 W UV lamps, located vertically around the reactor, at powers varying between 15 w /m⁻², 60 w /m⁻² and 90 w/m⁻² was applied to the photo-Fenton process. The yield in the photo-Fenton process is low. The maximum yields for COD, COD dis BOD5 were around 38%-45% at a sunlight power of 67 w/m², at 4 mg/L FE(II), with 50 mg/l H₂O₂ at 30