Study on Bleaching of Masson pine Kraft Pulp Boosted by Xylanase
1. Introduction The paper and pulp industry is a source of major pollution, generating large volumes of effluent for each metric ton of paper produced which has high biological oxygen demand (BOD) and chemical oxygen demand (COD), chlorinated compounds measured as adsorbable organic halides (AOX), chlorinated lignin derivatives such as chlorolignols, dioxins, and sulfur compounds, in response to stricter government rules regarding pollution control and to public awareness, paper mills are substituting elemental chlorine bleaching with environmentally friendly bleaching methods. Bioblcaching is an important alternative to reduce the use o~ chlorine and chlorine compounds in the bleaching process. The interest in xylanase and their application in the pulp and paper industries have advanced significantly over a past few years because it is an environmentally friendly approach that can reduce the negative impact on the environment exerted by the use of chlorine-based bleaching agents. Xylanases are primarily being used for the removal of xylan and lignin-carbohydrate complex that are, otherwise, generated in the kraft pulping process and act as physical barrier to the entry of bleaching chemicals. Other significant benefits of xylanase treatment include higher brightness ceilings, reduction in the amounts of bleaching chemicals needed to achieve higher brightness and decrease in amounts of organochlorine compounds in the bleach plant effluents. On average, a 25% reduction of the consumption of active chlorine can be achieved which results in a decrease in the toxicity, colour, chloride and AOX levels of bleaching effluents, in this paper, the present study has attempted to study the effect of xylanase on masson pine kraft pulp in OD1/CEopD2 bleaching sequences.
CHEN Li-hui HUANG Liu-lian CHEN Yan-xi
College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China
国际会议
International Symposium on Wood Science and Technology(IAWPS 2008)(国际木材产品学会联合会2008学术研讨会)
哈尔滨
英文
343-344
2008-09-27（万方平台首次上网日期，不代表论文的发表时间）