Abstract: The paper studied the adsorption effect of cadmium and influence factors by a high cadmium-resistant fungal strain (Paecilomyces lilacinus 6-20p). The results showed that the optimal culture of Paecilomyces lilacinus 6-20p was obtained at 108 hours. The elimination rates of Cd²⁺ in the media showed a trend of first increasing and then decreasing with the increasing of pH, culture temperature and culture time. The optimal conditions to Cd²⁺+ adsorption by Paecilomyces lilacinus 6-20p were at pH 3.5 and 30℃ after 108 h. Growth of Paecilomyces lilacinus 6-20p was not significantly influenced by the Cd²⁺ concentration in the media. The elimination rates of Cd²⁺ decreased with the increasing of initial Cd²⁺ concentrations when Cd²⁺ concentrations>35.2 mg/L. Therefore, cadmium adsorption by Paecilomyces lilacinus 6-20p were significantly influenced by pH, culture temperature, culture time and initial Cd²⁺ concentration. All these factors should be considered in application of Paecilomyces lilacinus 6-20p.

Key words: Paecilomyces lilacinus, spore suspension, adsorption, elimination rate; Cd²⁺

摘要： 开展了一株高耐镉真菌Paecilomyces lilacinus 6-20p对Cd²⁺的吸附效果及影响因素的研究。结果表明获取Paecilomyces lilacinus 6-20p最大生长量的培养时间为108 h。Paecilomyces lilacinus 6-20p对培养液中Cd²⁺的去除率随pH、培养温度、培养时间呈现先增高后降低的趋势，对Cd²⁺吸附的最佳条件为pH 3.5，30℃培养108 h。培养液中Cd²⁺初始浓度小于35.2 mg/L时，Paecilomyces lilacinus 6-20p的生长未受到抑制。当Cd²⁺浓度大于35.2 mg/L时，其对培养液中Cd²⁺的去除率随Cd²⁺初始浓度增加而降低。pH、培养温度、培养时间以及Cd²⁺初始浓度等因素均能显著影响Paecilomyces lilacinus 6-20p对Cd²⁺的吸附效果，在菌株应用过程中应充分考虑这些因素。

关键词:
淡紫拟青霉, 孢子悬液, 吸附, 去除率, 镉离子