聚球藻对镍的富集作用及影响因素

Influencing factors on Ni bioaccumulation by Synechcoccus

研究了环境因素与自身因素对聚球藻富集镍的影响.聚球藻对镍的富集时间在80 min可以达到平衡;镍藻质量比最优值为16%～18%,此时富集量达到最大值即饱和吸附范围; pH值是影响富集的一个重要因素,同样条件下随pH值的增加富集量会不断增加,但由于过高pH会导致氢氧化镍生成,因此最佳pH值在9～10;温度和光强是调节富集量的两个因素, 温度在35℃、照度在3000lx左右是最佳的富集条件;同样条件下,死藻比活藻的富集量略高.

Influencing factors on Ni bioaccumulation by Synechcoccus were studied. The equilibration time of Ni bioaccumulation was about 80 min in aqueous solution. The bioaccumulation quantity reached a maximum when the mass ratio of Ni to Synechcoccus was between 16%-18%, and increased with the increasing ofpH. The optimum pH was 9-10 because high pH would lead to precipitation of Ni（OH）2. The bioaccumulation quantity was also influenced by temperature and illumination intensity and the optimal condition was 35℃ and 3000 lx. The bioaccumulation of nonliving algae was lager than that of living algae.