Xylanase-Aided Chlorine Dioxide Bleaching of Bagasse Pulp to Reduce AOX Formation

BioResources

Shuangxi Nie¹  Cong Gao¹  Chengrong Qin²  Sha He²  Xueping Song³  Yi Dai⁴ 

[1] China;College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, PR China;Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, PR China;College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, PR China;

关键词: Xylanase;    AOX;    FTIR;    Hexenuronic acid;    GC-MS;   

DOI  :  10.15376/biores.11.2.3204-3214

来源: DOAJ

【 摘 要 】

Xylanase pretreatment was used to improve the chlorine dioxide bleaching of bagasse pulp. The pulp was pretreated with xylanase, which was followed by a chlorine dioxide bleaching stage. The HexA content of the pulp and the AOX content of the bleaching effluent were measured using UV-Vis and GC-MS methods, respectively. The results showed that a good correlation occurred between HexA and kappa number. HexA content of the pulp decreased significantly after the xylanase pretreatment. The AOX content of the bleaching effluent decreased as HexA was removed from the pulp. It was found that AOX could be reduced by up to 29.8%, comparing XD0 with a D0 stage. Fourier transform infrared spectroscopy (FTIR) was employed to determine the breakage of chemical bonds in the pulp. It revealed that some lignin and hemicellulose were removed after xylanase treatment. The GC-MS results showed that some toxic chloride such as 2,4,6-trichlorophenol could be completely removed after xylanase pretreatment.

【 授权许可】

Unknown