白腐菌对纸浆CEH漂白废水的脱色、消除毒性和芳香化合物的降解

Elimination of Toxicity and Decolorization of Eucalyptus CEH Bleaching Effluents with White Rot Basidiomycete Fungus

桉木硫酸盐浆ＣＥＨ漂白废水具有很强的毒性和很高的色度，废水中的色度主要来自＞１００ｋＤ的高分子量的氯化木素降解产物，而毒性主要是由一些低分子量（＜２ｋＤ）的氯化木素降解产物引起的。从本实验室选育出的菌株中，Ｐｈｌｅｂｉａｒａｄｉａｔａ对废水有较高的脱色和消除毒性的能力；从不同的木素降解酶对脱色和毒性消除的能力看，Ｌｉｐ更强一些；黎芦醇和Ｈ２Ｏ２促进了Ｐｈｌｅｂｉａｒａｄｉａｔａ对氯代愈创木酚的降解。

Effluents resulted from the CEH bleaching of eucalyptus kraft pulp were found to be highly toxic and loaded with coloring constituents. The colorily comes chiefly from the degradation products of the high molecular weight chlorinated lignin (<10kD), whereas low molecular weight (<10kD) degradation products of chlorinated lignin are chiefly responsible for the toxicity. Attempts were conducted in this laboratory to remove the coloring constituents and to eliminate toxicity with white rot basidiomycete fungi. Among the fungus strains studied and screened, Phlebia radiata, Ridigporus lignosus and Junghuhnia, as well as lignolytic enzymes derived from them, have been found to be able to remove odor and toxicity of the bleaching effluents effectively. Lignolytic enzymes are less effective than their mother fungi. Phlebia radiata has been found to be the most efficient species in degrading chlorinated guaiacols. Addition of vertryl alcohol and hydrogen peroxide would tend to enhance the degradation effect of Phlebia radiata.