白腐菌降解氯代酚类化合物的特性研究

研究了Mn^2＋对白腐菌（Phanerochanete chrysosporium）产生的过氧化物酶（MnP和LiP）活力的影响及胞内外酶在氯代酚化合物降解过程中的作用。结果表明：Mn^2＋对MnP和LiP的活力有显著影响；白腐菌对相对分子质量低的有机化合物的降解主要在细胞内依靠胞内酶的作用进行，而胞外酶加快了降解速率；两种胞外酶MnP和LiP在降解过程中所起的作用不同，MnP起主要作用，LiP起次要作用。白腐茵对酚类化合物的基质亲和性较活性污泥低，适宜于高浓有机废水的预处理；白腐茵对毒性的忍受能力与活性污泥微生物相似，但处理方式和条件的改变可以提高其毒性忍受能力。

Characters of Biodegradation of Chlorophenols by White Rot Fungus

The paper presents the effects of Mn~2+ on white rot fungus, Phanerochaete chrysosporium, particularly in its production of the extracellular enzymes, lignin peroxidases (LiP) and manganese peroxidases (MnP) in the biodegradation of chlorophenols. The presence of Mn~2+ resultes in more production of MnP and less production of LiP. Degradation of low molecular weight chlorophenols by white rot fungus takes place mainly inside the cells by intracellular enzymes, and the overall degradation rates are increased by the fungus enzymes. The presence of Mn~2+ enhances the observed degradation rates, suggesting that MnP plays a more important role than LiP in the degradation of chlorophenols. Relative to activated sludge-mixed liquors, the white rot fungus has a much lower affinity to chlorophenols, making it ideal for pretreatment of wastewaters containing high concentrations of such compounds. The toxicity tolerance of white rot fungus, which is similar to that of the activated sludge, may be improved when a more appropriate treatment process and/or more optimum treatment conditions are employed.