Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Oxidative degradation of tetramethylammonium hydroxide (TMAH) by UV/persulfate and associated acute toxicity assessment
Tetramethylammonium hydroxide (TMAH) is widely used in high-tech industries as a developing agent. Ultraviolet (UV) light–activated persulfate (PS, S2O82−) can be used to generate strongly oxidative sulfate radicals, and it also exhibits the potential to treat TMAH-containing wastewater. This study initially investigated the effect of S2O82− concentration and UV strength on the UV/S2O82− process for the degradation of TMAH in a batch reactor. The results suggested that 15 watts (W) of UV-activated S2O82− at concentrations of 10 or 50 mM resulted in pseudo-first-order TMAH degradation rate constants of 3.1–4.2 × 10−2 min−1, which was adopted for determining the hydraulic retention time (HRT) in a continuous stirred tank reactor (CSTR). The operating conditions (15 W UV/10 mM S2O82−) with a HRT of 129 min resulted in stable residual concentrations of S2O82− and TMAH at approximately 2.6 mM and 20 mg L−1 in effluent, respectively. Several TMAH degradation intermediates including trimethylamine, dimethylamine, and methylamine were also detected. The effluent was adjusted to a neutral pH and evaluated for its biological acute toxicity using Cyprinus carpio as a bioassay organism. The “bio-acute toxicity unit” (TUa) was determined to be 1.41, which indicated that the effluent was acceptable for being discharged into an aquatic ecosystem.
Oxidative degradation of tetramethylammonium hydroxide (TMAH) by UV/persulfate and associated acute toxicity assessment
Tetramethylammonium hydroxide (TMAH) is widely used in high-tech industries as a developing agent. Ultraviolet (UV) light–activated persulfate (PS, S2O82−) can be used to generate strongly oxidative sulfate radicals, and it also exhibits the potential to treat TMAH-containing wastewater. This study initially investigated the effect of S2O82− concentration and UV strength on the UV/S2O82− process for the degradation of TMAH in a batch reactor. The results suggested that 15 watts (W) of UV-activated S2O82− at concentrations of 10 or 50 mM resulted in pseudo-first-order TMAH degradation rate constants of 3.1–4.2 × 10−2 min−1, which was adopted for determining the hydraulic retention time (HRT) in a continuous stirred tank reactor (CSTR). The operating conditions (15 W UV/10 mM S2O82−) with a HRT of 129 min resulted in stable residual concentrations of S2O82− and TMAH at approximately 2.6 mM and 20 mg L−1 in effluent, respectively. Several TMAH degradation intermediates including trimethylamine, dimethylamine, and methylamine were also detected. The effluent was adjusted to a neutral pH and evaluated for its biological acute toxicity using Cyprinus carpio as a bioassay organism. The “bio-acute toxicity unit” (TUa) was determined to be 1.41, which indicated that the effluent was acceptable for being discharged into an aquatic ecosystem.
Oxidative degradation of tetramethylammonium hydroxide (TMAH) by UV/persulfate and associated acute toxicity assessment
Huang, Jingting (Autor:in) / Wang, Kai-Sung (Autor:in) / Liang, Chenju (Autor:in)
Journal of Environmental Science and Health, Part A ; 52 ; 930-937
29.07.2017
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
A Study on Oxidation of Tetramethylammonium Hydroxide (TMAH) using UV/Persulfate
| DOAJ | 2020
| British Library Online Contents | 2007
Corrosion of porous silicon in tetramethylammonium hydroxide solution
| British Library Online Contents | 2014