蛋白核小球藻的絮凝与对重金属Cd^(2+)的吸附性能研究

Study on Chitosan Flocculation of Chlorella Pyrenoidosa and Its Adsorption Performance for Heavy Metal Cd

利用光合效率高、生物吸附力强且可以大规模低成本开放培养的蛋白核小球藻吸附重金属Cd^(2+)是一种极具前景的水处理手段。藻细胞密度低,藻液处理量特别大,采收成本高成为限制其应用的重要瓶颈之一。结果表明,在蛋白核小球藻溶液中加入0.021%壳聚糖且pH为7时,蛋白核小球藻达到最佳絮凝状态,在此条件下,蛋白核小球藻对重金属Cd^(2+)的吸附率可以达到98.00%,吸附量为4.06 mg/g。实验证明,壳聚糖作为絮凝剂可实现低成本采收蛋白核小球藻且不影响其对重金属Cd^(2+)的吸附效果。

Chlorella pyrenoidosa, featured by high photosynthetic efficiency, strong biosorption ability, and capability of large-scale low-cost open cultivation, is a highly promising water processing choice for Cd^(2+) adsorption.However, the bottlenecks against its application include low algal cell density, large algal liquid processing demand, and high costs of harvesting.The results show that the flocculation effect is optimized when 0.021% chitosan is added into Chlorella pyrenoidosa solutions at pH=7,and under these conditions, the Cd^(2+) adsorption efficiency is also optimized, and the adsorption capacity and efficiency are maximized to 4.06 mg/g and 98% respectively.This study offers a theoretical basis for the use of chitosan flocculants into low-cost harvesting of Chlorella pyrenoidosa without lowering Cd^(2+) adsorption efficiency, and for low-cost efficient processing of aqueous heavy metals.