机械清洗膜组件对膜通量影响的初步研究

试验设计了强化机械清洗膜组件M1和机械清洗膜组件M2,通过正交试验考察了污泥浓度、曝气量、运行膜通量和抽吸时间:间歇时间对2组膜组件的膜过滤特性的影响.结果表明,M1膜组件可以弱化不利条件如高污泥浓度(MLSS)、高运行膜通量和低曝气强度的影响;曝气量和运行膜通量是影响膜比通量的主要因素;并得到一组较佳的操作条件组合:污泥浓度6g/L、曝气量0.5m³/h、抽吸时间和间歇时间的比为12:1.在此条件下长期运行试验表明,M1和M2膜通量均可以维持在40L/(h·m²).通过测定2组膜组件的阻力分布,表明机械清洗可以大大减弱膜面泥饼层污染.

The Influence of Mechanical-cleaning Membrane Module on Membrane Flux

An enhanced mechanical-cleaning membrane module M1 and a mechanical-cleaning membrane module M2 were designed in this research. An orthogonal array design was adopted to investigate effects of operational parameters including aeration intensity, membrane flux, MLSS, ratio of suction time and non-suction time on membrane filtration of two membrane module of M1 and M2. The results showed that M1 could weaken the negative influence of disadvantage parameters including high MLSS, high membrane flux, and low aeration intensity on membrane flux. M1 and M2 module both maintained a high flux of 40L/(h·m²) under the conditions of MLSS 6g/L, aeration 0.5 m³/h, ratio of suction time and non-suction time of 12/1, which was selected by the study of orthogonal array. Resistance distribution showed that the mechanism of mechanical-cleaning help to remove the sludge cake pollution on membrane surface.