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UV light photo-Fenton degradation of polyphenols in oolong tea manufacturing wastewater.

Abstract

The UV light photo-Fenton degradation of oolong tea polyphenols in tea manufacturing effluent that color the wastewater to a dark brown has been examined. In order to elucidate the photo-Fenton degradation mechanism of oolong tea polyphenols and find the optimal dosages of the Fenton reagents, systematic study has been conducted. For the UV light photo-Fenton degradation of oolong tea effluent being 70 mg-(polyphenol) L(-1), the optimum dosages of Fenton reagents were found to be 20 mgL(-1) of total Fe and 500 mgL(-1) of H2O2. The polyphenol degradation could be divided into two stages. The polyphenols concentration rapidly decreased to around 30% of the initial concentration within 2 min and the degradation rate significantly slowed down in the subsequent stage. After 60 min of UV light irradiation, 97% polyphenol removal was obtained. The initial quick degradation of oolong tea polyphenols suggests that hydroxyl radical generated by the photo-Fenton process might preferentially attack polyphenols having high antioxidant activity by scavenging hydroxyl radicals. Almost complete decolorization of the oolong tea effluent was achieved after 80 min. About 96% mineralization of 63 mgL(-1) TOC loading was achieved within 60 min and then further mineralization was rather slow. The complete COD removal of 239 mgL(-1) COD loading was obtained after 100 min. The present results indicate that the UV light photo-Fenton degradation process can treat tea manufacturing wastewaters very effectively.

Authors+Show Affiliations

a Research Center for Biochemical and Environmental Engineering, Department of Applied Chemistry , Toyo University , Kawagoe , Saitama , Japan.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

24171419

Citation

Sabaikai, Waraluk, et al. "UV Light photo-Fenton Degradation of Polyphenols in Oolong Tea Manufacturing Wastewater." Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, vol. 49, no. 2, 2014, pp. 193-202.
Sabaikai W, Sekine M, Tokumura M, et al. UV light photo-Fenton degradation of polyphenols in oolong tea manufacturing wastewater. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2014;49(2):193-202.
Sabaikai, W., Sekine, M., Tokumura, M., & Kawase, Y. (2014). UV light photo-Fenton degradation of polyphenols in oolong tea manufacturing wastewater. Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, 49(2), 193-202. https://doi.org/10.1080/10934529.2013.838873
Sabaikai W, et al. UV Light photo-Fenton Degradation of Polyphenols in Oolong Tea Manufacturing Wastewater. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2014;49(2):193-202. PubMed PMID: 24171419.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - UV light photo-Fenton degradation of polyphenols in oolong tea manufacturing wastewater. AU - Sabaikai,Waraluk, AU - Sekine,Makoto, AU - Tokumura,Masahiro, AU - Kawase,Yoshinori, PY - 2013/11/1/entrez PY - 2013/11/1/pubmed PY - 2014/6/10/medline SP - 193 EP - 202 JF - Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering JO - J Environ Sci Health A Tox Hazard Subst Environ Eng VL - 49 IS - 2 N2 - The UV light photo-Fenton degradation of oolong tea polyphenols in tea manufacturing effluent that color the wastewater to a dark brown has been examined. In order to elucidate the photo-Fenton degradation mechanism of oolong tea polyphenols and find the optimal dosages of the Fenton reagents, systematic study has been conducted. For the UV light photo-Fenton degradation of oolong tea effluent being 70 mg-(polyphenol) L(-1), the optimum dosages of Fenton reagents were found to be 20 mgL(-1) of total Fe and 500 mgL(-1) of H2O2. The polyphenol degradation could be divided into two stages. The polyphenols concentration rapidly decreased to around 30% of the initial concentration within 2 min and the degradation rate significantly slowed down in the subsequent stage. After 60 min of UV light irradiation, 97% polyphenol removal was obtained. The initial quick degradation of oolong tea polyphenols suggests that hydroxyl radical generated by the photo-Fenton process might preferentially attack polyphenols having high antioxidant activity by scavenging hydroxyl radicals. Almost complete decolorization of the oolong tea effluent was achieved after 80 min. About 96% mineralization of 63 mgL(-1) TOC loading was achieved within 60 min and then further mineralization was rather slow. The complete COD removal of 239 mgL(-1) COD loading was obtained after 100 min. The present results indicate that the UV light photo-Fenton degradation process can treat tea manufacturing wastewaters very effectively. SN - 1532-4117 UR - https://www.unboundmedicine.com/medline/citation/24171419/UV_light_photo_Fenton_degradation_of_polyphenols_in_oolong_tea_manufacturing_wastewater_ L2 - https://www.tandfonline.com/doi/full/10.1080/10934529.2013.838873 DB - PRIME DP - Unbound Medicine ER -