Unexpected promotion of PCDD/F formation by enzyme-aided Cl-2 bleaching in non-wood pulp and paper mill

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Unexpected promotion of PCDD/F formation by enzyme-aided Cl-2 bleaching in non-wood pulp and paper mill
	Guo, Li; Huang, Linyan; Fang, Liping; Zheng, Minghui; Liu, Guorui; Zhao, Yuyang; Liu, Wenbin
刊名	CHEMOSPHERE
	2017
卷号	168 期号:0 页码:523-528
关键词	Dioxins Pulp And Paper Making Xylanase Bleaching Non-wood Fiber
英文摘要	Enzyme-aided Cl-2 bleaching is widely considered as promising replacements for conventional Cl-2 bleaching in wood pulp and paper mills. However, the effects of using enzyme-aided bleaching on the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the non-wood pulp and paper mills are unclear. A field study was performed to investigate PCDD/F formation when enzyme aided Cl-2 bleaching was used to replace conventional Cl-2 bleaching in non-wood pulp and paper mills. Unexpectedly, the PCDD/F toxic equivalents (TEQs) in solid samples were higher when using enzyme aided bleaching (0.49-5.4 pg TEQ/g) than that using conventional Cl-2 bleaching (0.15-2.44 pg TEQ/g). Large amounts of octachlorodibenzo-p-dioxin were formed during the enzyme-aided bleaching process. This could have been because enzyme strongly promoted the release of organic molecules bound to lignin and thus accelerated the formation of octachlorodibenzo-p-dioxin through organic molecular precursors. Although enzyme-aided Cl-2 bleaching was previously considered to be efficient for reducing PCDD/F releases and to be the best available technologies and best environmental practices for wood pulp and paper mills, the results obtained in this study suggested the necessity and urgency to evaluate the suitability of enzyme-aided Cl-2 bleaching for non-wood pulp and paper mills that intensively practiced in developing countries. (C) 2016 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39451]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Guo, Li,Huang, Linyan,Fang, Liping,et al. Unexpected promotion of PCDD/F formation by enzyme-aided Cl-2 bleaching in non-wood pulp and paper mill[J]. CHEMOSPHERE,2017,168(0):523-528.
APA	Guo, Li.,Huang, Linyan.,Fang, Liping.,Zheng, Minghui.,Liu, Guorui.,...&Liu, Wenbin.(2017).Unexpected promotion of PCDD/F formation by enzyme-aided Cl-2 bleaching in non-wood pulp and paper mill.CHEMOSPHERE,168(0),523-528.
MLA	Guo, Li,et al."Unexpected promotion of PCDD/F formation by enzyme-aided Cl-2 bleaching in non-wood pulp and paper mill".CHEMOSPHERE 168.0(2017):523-528.