关键词:
淡紫拟青霉, 孢子悬液, 吸附, 去除率, 镉离子

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⁺