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Hospital Laundry Wastewater Disinfection with Catalytic Photoozonation
Author(s) -
Kist Lourdes Teresinha,
Albrecht Caroline,
Machado Ênio Leandro
Publication year - 2008
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.200700175
Subject(s) - laundry , wastewater , chemical oxygen demand , turbidity , pulp and paper industry , photocatalysis , chemistry , environmental science , environmental chemistry , hazardous waste , waste management , catalysis , environmental engineering , organic chemistry , biology , ecology , engineering
Wastewater production in a hospital laundry and the treatment of the most critical wastewater stream, are assessed. Hospital laundry wastewaters are hazardous to the environment due to their high pollutant concentrations and the chemicals added during the clothes washing process. Heterogeneous photocatalysis with UV, O 3 and TiO 2 and their possible combinations were used for disinfection purposes. A ramp‐type reactor was used for TiO 2 (P25 Degussa) fixation and for photochemical diffusion of the ozonized air. After assessing 5‐day biological oxygen demand, chemical oxygen demand, pH, turbidity, and surfactant content, and checking for the presence of thermotolerant coliforms and Escherichia coli , it was concluded that UV/O 3 /TiO 2 was the best process/combination, yielding a 100% disinfection rate and a microbiological inactivation of 0.5070 min –1 for E. coli and of 0.5505 min –1 for thermotolerant coliforms.