造纸工业中二噁英污染的形成和控制措施

Formation and Control Measure of Dioxin Pollution in Papermaking Industry

二英是一类毒性极强的物质 ,二英污染是关系到造纸工业发展的战略性问题。在整个造纸工艺过程中 ,二英污染物不仅存在于纸浆、纸厂污泥和纸品中 ,还存在于植物纤维材料的防腐剂中。因此 ,弄清二英在造纸工业中的来源和形成机理是降低二英污染物的关键。文中从造纸工业中二英污染物来源、产生和形成机理等方面讨论了二英污染物的控制。指出了从源头控制 ,减少含氯漂白剂的使用 ,使用氧脱木素、过氧化氢漂白、臭氧漂白、酶漂、其他ECF和TCF漂白工艺是消除二英污染的根本途径。

Dioxin is believed as one of the most poisonous substances. Dioxin pollution is strategic problem for paper industry further developoment and must be solved. In papermaking industry, dioxin not only exists in pulp, sludge, paper products, but also in the volatile of woods, chips or other non-wood fiber material which are treated with the aromatic compounds to avoid getting rotten. To find out the source and formation mechanism of dioxin is the key to decrease the dioxin pollution in papermaking industry. This paper discussed the control measure of dioxin from different aspects, such as source, formation mechanism etc., and pointed out that the fundamental measures to eliminate the pollution of dioxin is to control the origin, decrease or completely give up the use of chlorine containing bleaching agents, advocate the application of oxygen delignification, hydrogen peroxide bleaching, ozone bleaching, biobleaching and other Elemental Chlorine Free and Total Chlorine Free bleaching.