【摘要】 采用不同截留分子量的超滤膜去除螺旋藻回用培养液中的生长抑制物,考虑微滤预处理、操作压力、料液温度、料液pH、转速对超滤膜通量的影响,在此基础上通过正交实验确定微滤预处理后超滤的最佳去除工艺,最后通过测定清洗前后膜的水通量变化确定最佳清洗方法.结果表明,100kDa的超滤膜对回用培养液中的抑制物有显著去除效果,去除抑制物的最佳工艺参数为超滤压力0.2MPa、搅拌转速450r/min、料液pH 9、料液温度35℃;最佳清洗方法为35℃温水清洗0.5h,此条件下膜通量恢复率达94%.更多还原

【Abstract】 The method of ultrafiltration technique was adopted for separation of auto-growth inhibitors of Spirulina platensis.The effect of molecular weight cut offs(MWCOs)of membrane on removal efficiency was investigated.Ultrafiltration conditions for the auto-growth inhibitors of Spirulina platensis extracts from used culture medium were optimized by orthogonal array design based on membrane flux.It is indicated that 100 kDa can reduce autogrowth inhibitors effectively,and the optimized ultrafiltration conditions were found to be 0.20 MPa,450r/min,35 ℃ and 9for pressure,mixing speed,temperature and sample pH,respectively.Cleaning with deionized water at35 ℃for 0.5hwas the best method for membrane cleaning,and the flux recovery rate of membrane after cleaning was about 94%.更多还原