白腐真菌对造纸黑液脱色效果的研究

STUDY ON THE EFFECTS OF DECOLORIZATION IN THE BLACK LIQUOR BY WHITE-ROT FUNGI

脱色是造纸废黑液处理工艺中的一个重要环节,作者应用白腐真菌对造纸黑液进行了脱色处理,探讨了影响脱色效果的因子,并确定出最佳脱色条件.白腐真菌系从自然界腐朽木材上分离和纯化培养得到,研究了木质素溶液质量浓度(污染负荷)、pH值、搅拌速度、碳源和氮源质量浓度、[Fe2+]质量浓度变化对造纸黑液脱色效果的影响.实验确定的白腐真菌对造纸黑液脱色的最佳条件为:木质素质量浓度为153mg/L,pH为5左右,搅拌速度为250r/min,葡萄糖质量浓度为1g/L,酒石酸铵质量浓度为0.20g/L,[Fe2+]质量浓度为0.08mg/L,在此条件下白腐真菌对造纸黑液的脱色率最高可达65%.

Decolorization is one of important point in black liquor treatment process.Use the white-rot fungus to decolorize black liquor.Explore the influence factors of white-rot decolorize black liquor,and make sure the optimal decolorization conditions.Use special culture medium to separate and purify white-rot fungus which has been separated from the rotten wood and cultured.Analyze the influence of degradation effect by the following ingredient：different lignin consistency,pH value,stirring speed,consistency of carbon and nitrogen source,and Fe2＋ consistency,so as to choose the best conditions of white-rot fungi for decolorization.Result of experiment show the best conditions are：lignin=153 mg/L,pH=5,the rotate speed is 250 r/min,glucose=1 g/L,ammonium tartrate=0.20 g/L,Fe2＋=0.08 mg/L.Under these conditions,the decoloring rate of white-rot fungus decolorize the black liquor up to 64.38%.