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学科主题: 物理化学
题名: Kinetics of PCDD/Fs Formation from Non-Wood Pulp Bleaching with Chlorine
作者: Wang, Xueli1;  Zhang, Haijun1;  Ni, Yuwen1;  Du, Qinqin1;  Zhang, Xueping1;  Chen, Jiping1
通讯作者: 陈吉平
刊名: ENVIRONMENTAL SCIENCE & TECHNOLOGY
发表日期: 2014-04-15
DOI: 10.1021/es404347h
卷: 48, 期:8, 页:4361-4367
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Life Sciences & Biomedicine
类目[WOS]: Engineering, Environmental ;  Environmental Sciences
研究领域[WOS]: Engineering ;  Environmental Sciences & Ecology
英文摘要: Chlorine bleaching is still practiced by most of nonwood pulp and paper mills, resulting in a considerable amount of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) formation and emission. In this study, the effects of primary chlorination conditions on the formation of PCDD/Fs from nonwood pulp bleaching with elemental chlorine were investigated. It was found that low-chlorinated PCDD/Fs were usually formed and then underwent further chlorination to form highly chlorinated PCDD/Fs with increasing chlorination time. Higher available chlorine dosages and lower system pH values greatly accelerated dioxin formation, and pH 3 was the threshold for the formation of tetra- to octa-CDD/Fs. Higher temperatures promoted the formation of lower-chlorinated PCDD/Fs, while caused significant reduction of tetra- to hepta-CDDs and penta- to octa-OCDFs. PCDFs were formed much faster than PCDDs. A first-order kinetic model showed a good fit to the data for tetra- to oct-CDFs formation under different chlorination conditions, indicating that chlorine substitution was the rate determining step for their formation. Finally, the optimum chlorination conditions for minimizing and eliminating the formation of 2,3,7,8-TCDD/TCDF in nonwood pulp bleaching with elemental chlorine were established.
关键词[WOS]: DIBENZO-P-DIOXINS ;  PAPER-MILLS ;  KRAFT PULP ;  POLYCHLORINATED PHENOLS ;  CHINESE PULP ;  PCDFS ;  INDUSTRY ;  MECHANISMS ;  EFFLUENTS ;  EMISSION
语种: 英语
WOS记录号: WOS:000334658400016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/144094
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Inst Chem Phys, Chinese Acad Sci, Dalian 116023, Peoples R China

Recommended Citation:
Wang, Xueli,Zhang, Haijun,Ni, Yuwen,et al. Kinetics of PCDD/Fs Formation from Non-Wood Pulp Bleaching with Chlorine[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2014,48(8):4361-4367.
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