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Use of Ozone‐Based Processes for the Removal of Pharmaceuticals Detected in a Wastewater Treatment Plant
Author(s) -
Kim Ilho,
Tanaka Hiroaki
Publication year - 2010
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143009x12487095236630
Subject(s) - ozone , effluent , bromate , chemistry , wastewater , sewage treatment , environmental chemistry , water treatment , pulp and paper industry , environmental engineering , environmental science , ion , organic chemistry , engineering
Ozone (O 3 )‐based processes (O 3 , O 3 /H 2 O 2 , and O 3 /UV) were investigated for the removal of pharmaceuticals in real wastewater using a bench‐scale experimental setup. An ozone dose of 6 mg/L (contact time = 10 minutes) was found to reduce the concentration of most pharmaceuticals detected in secondary effluent. Caffeine, N , N ‐Diethyl‐ meta ‐toluamide (DEET), and cyclophosphamide were removed with efficiencies of 84, 89, and 46%, respectively, even with a contact time of 15 minutes (O 3 dose = 6 mg/L). In the case of the ozone process alone, the concentration of bromate ion in the effluent increased with longer contact time. On the other hand, it was found that the O 3 /H 2 O 2 and O 3 /UV processes can be used as alternative processes for effective removal of pharmaceuticals, while leaving a low residual concentration of dissolved ozone in the system, thereby preventing bromate formation.