Influence of pH value on sulfonamide ozonation using caffeine as a contamination indicator

Author(s)

Gireli, Glenda Araujo S. ^[1] ; Maniero, Milena Guedes ^[1] ; Guimaraes, Jose Roberto ^[1]

Affiliation

^[1] Univ Estadual Campinas, Sch Civil Engn Architecture & Urban Design, POB 6143, BR-13083889 Campinas - Brazil

• Document type: Journal article
• Source: WATER SCIENCE AND TECHNOLOGY-WATER SUPPLY; v. 20, n. 2, p. 508-515, MAR 2020.
• Web of Science Citations: 0

Abstract

Ozonation was effective in degrading six sulfonamides: sulfaquinoxaline, sulfamethazine, sulfamethoxazole, sulfathiazole, sulfadimethoxine, and sulfadiazine (C-0 = 100 mu g L-1). The degradation experiments were based on two variables: pH (3.0, 7.0 and 11.0) and aqueous matrix (ultrapure water, tap water, and surface water). In all matrices studied and pH 11.0, more than 99% of the drugs were degraded with the highest applied ozone dose (65 mg L-1), when compared with other pH values. Also, comparing the three aqueous matrices, the ultrapure water was the one that required the lowest ozone dosage (6.4 mg L-1) to reach the same degradation efficiency of the sulfonamides. Caffeine is known as an environment contamination indicator. Therefore, this does not intend to totally remove this compound, but to verify its degradation level compared with the sulfonamides. (AU)

• FAPESP's process: 13/09543-7 - Residues of veterinary drugs in the environment
• Grantee: Susanne Rath
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/07817-2 - Degradation of sulfonamides and tetraciclines by UV/H2O2 and O3: evaluation of antimicrobial activity and toxicity
• Grantee: Milena Guedes Maniero Ferreira
• Support Opportunities: Scholarships in Brazil - Post-Doctoral