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Water Sci Technol

Title:		Comparative study of UV/H(2)O(2) and UV/PMS processes for treating pulp and paper wastewater
Author(s):		Wang L; Fei Y; Gong C; Shan Y; Zhang Z; Zhang F; Cheng H;
Address:		"Institute of Resources and Environment, Beijing Academy of Science and Technology, No.1 Gao Li Zhang Road, Beijing 100095, China E-mail: cn.zhang@163.com. Shandong Huatai Paper Co., Ltd, Dongying 257335, China"
Journal Title:		Water Sci Technol
Year:		2022
Volume:		86
Issue:		8
Page Number:		2032 - 2044
DOI:		10.2166/wst.2022.326
ISSN/ISBN:		0273-1223 (Print) 0273-1223 (Linking)
Abstract:		"Pulp and paper wastewater (PPWW) contains numerous refractory and harmful contaminants that require advanced treatment to meet the discharge criteria. This study compared the efficacy of two PPWW treatments: ultraviolet/peroxymonosulfate (UV/PMS) and ultraviolet/H(2)O(2) (UV/H(2)O(2)) working under similar circumstances. The initial pH value, oxidant dosage, UV radiation intensity, and pseudo-first-order constant k(obs) were systematically studied in both systems. Optimally, the UV/PMS process produced an effluent of higher quality than the UV/H(2)O(2), as measured by the removal efficiencies of chemical oxygen demand (COD) in 60 min, which were 48.2 and 64.3% for the respective UV/H(2)O(2) and UV/PMS processes and corresponding k(obs) values of 0.0102 and 0.0159 min(-1), respectively. Radical scavenging experiments demonstrated that *OH was the primary reactive oxygen species in UV/H(2)O(2) process, and *OH and SO(4)(-)* in the UV/PMS process. Moreover, ultraviolet-visible spectroscopy and gas chromatography coupled mass spectroscopy analyses showed that deep treatment of petroleum hydrocarbons with carbon chain lengths greater than 18 and macromolecular semi-volatile organic compounds in paper wastewater is difficult, whereas the UV/PMS process can significantly improve the removal of amides, esters, phenols, and other aromatic compounds"
Keywords:		"*Wastewater/chemistry Ultraviolet Rays Hydrogen Peroxide/chemistry *Water Pollutants, Chemical/chemistry Oxidation-Reduction;"
Notes:		"MedlineWang, Liangliang Fei, Yuchao Gong, Chenhao Shan, Yue Zhang, Zhongguo Zhang, Fengshan Cheng, Hongshun eng England 2022/11/01 Water Sci Technol. 2022 Oct; 86(8):2032-2044. doi: 10.2166/wst.2022.326"