陶瓷微滤膜回收分子筛过程中的反冲洗技术

Investigation of Backflushing Used in Recovering Molecular Sieve Particles by Ceramic Microfiltration Membrane

用陶瓷微滤膜处理微米级无机颗粒悬浮液过程中,最大的问题是膜极易受到污染。许多实验证明,反冲洗技术是控制膜污染的一种稳定、有效、可重复的方法。在对陶瓷微滤膜回收分子筛颗粒过程中运用反冲洗技术控制膜污染进行研究中,考察了反冲压力、反冲时间、反冲周期对反冲效果的影响。认为影响膜恢复通量的决定因素是反冲压力,而反冲时间、反冲周期对膜恢复通量影响不大。从设备的耐压、能耗、投资等方面综合考虑,确定了反冲压力为0.4MPa,反冲时间为3s;从工程实际运用出发,将膜系统的有效透水率作为考察对象,在膜的有效透水率最大值时膜系统的最佳反冲周期为10min。

When the ceramic membrane is used to treat micro-sized inorganic particle suspensions in the microfiltration process, the biggest problem is that the membrane could be fouled easily. The technique of backflushing is a stable ,valid and reusable method to control the membrane fouling in the microfiltration which is demonstrated by a lot of experiments. The investitation was made for the use of backflushing to control membrane fouling in recovering molecular sieve particles by ceramic microfiltration membrane. The influences of backflushing pressure,backflushing time,backflushing interval on the backflushing were studied. The most important factor affecting the recover flux is backflushing pressure, backflushing time and backflushing interval have slight influence on recover flux. Considering synthetically the influence of pressure proof, energy consume and investment of the equipments, the satisfied backflushing operation parameters are determined: backflushingpressure is 0.4 MPa, backflushing time is 3 second. Based on engineering situation, the effective rate of permeate flux was taken as investigation object of the membrane system. The optimum backflushing interval is determined,which is 10 minutes, when the value of the rate of permeate flux arrives at the maximum.