Degradation of Tetramethylammonium Hydroxide through the Coupling of Ozonation with Other Advanced Oxidation Processes

• Published in: Ozone: science & engineering Vol. 42; no. 5; pp. 439 - 449
• Main Authors: Wang, Chikang, Lin, Chao-Kun
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 02.09.2020; Taylor & Francis Ltd
• Subjects: Cell viability; Degradation; Dosage; Hydrogen peroxide; Irradiation; Mineralization; Oxidation; Ozonation; Ozone; TMAH; Toxicity; ultrafine bubble-enhanced ozonation; Ultrafines; Ultraviolet radiation
• ISSN: 0191-9512; 1547-6545
• DOI: 10.1080/01919512.2019.1695099

In this study, ozonation is coupled with other approaches for the degradation of tetramethylammonium hydroxide (TMAH) to increase the degradation efficiency and reduce the toxicity. A degradation of 70.9% was reached after the reaction of TMAH with ozone for 120 min at pH 11 with the ozone dosage of 16 g O 3 per gram TMAH per hour (16 g O 3  g −1 TMAH h −1 ). A mineralization of 47.6% was achieved and the cell viability increased from 60.6% (before treatment) to 83.8% (after treatment). When ozone was combined with H 2 O 2 and ultraviolet (UV) irradiation, the reaction stimulated by UV light did not facilitate TMAH degradation, whereas the addition of H 2 O 2 increased the production of ·OH, thereby increasing the TMAH degradation. The use of ultrafine bubble-enhanced ozonation reduced the required ozone dosage to 1/10 of that used for microbubble ozonation, but similar treatment efficiencies were achieved. The O 3 /H 2 O 2 approach is favorable for TMAH degradation; under optimal conditions, a degradation of 82.3% and mineralization of 53.5% can be achieved.