2种藻菌固定化改进方法的比较及优化研究

Optimization and comparison of two improved methods of algae-bacteria immobilized

研究了替换固定液及壳聚糖覆膜2种藻菌固定化改进方法,并对比2种改进方法对固定化效果及废水处理效果的影响.结果表明,2种方法都可增强固定化小球的稳定性与机械强度.4个周期后,经前种方法制备的固定化小球对COD,NH3-N,PO43--P的去除率分别为75.8%,42.5%,47.5%,后种方法制备的小球对2种污染物的去除率分别为73.8%,51.8%,54.5%.与改进前相比,前者降低了废水处理效果,而后者对处理效果影响不大.以壳聚糖覆膜作为改进方法,考察壳聚糖溶液的质量浓度,pH值和覆膜时间对固定化小球处理废水能力的影响,得到最佳浓度,pH值以及覆膜时间分别为1%,5.5,15min.

Two methods have been used to improve the performance of immobilized algal-bacterial beads： replacing the fixative and coating chitosan.Effect of improved ways on immobilization and removal efficiency has been discussed.The results show that the immobilized beads were improved on stability and mechanical property.After four weeks,the removal rate of COD,NH3-N,PO43——P were 75.8%,42.5%,47.5% with the former immobilized beads,respectively,the removal rate of the three pollution were 73.8%,51.8%,54.5% with the latter,respectively.It shows a lower pollutant removal efficiency on the former and little effect on the latter compared with that before improved.The impact of the concentration,pH and coated time of chitosan solution on the pollutant removal efficiency has been studied.The optimal concentration,pH,coated time were 1%,5.5,15min,respectively.