Characteristics of Particle Deposit and Resistance Build-up on Ultrafiltration Membranes of Different MWCOs: Application of a
- 作者：PDA Online Monitoring MethodXin JinPengkang JinXianbao WangXiaochang C. Wang
- 会议时间：2012-06-26
- 关键词：Ultrafiltration ; Molecular weight cutoff ; particle dispersion analyzer ; online monitoring
- 作者单位：School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China
- 母体文献：2012青岛国际脱盐大会论文集
- 会议名称：2012青岛国际脱盐大会
- 会议地点：青岛
- 主办单位：中国金属学会
- 语种：chi
- 分类号：S56;F23
摘要
UF membranes are widely used in water and wastewater treatment for the removal of particles in place of rapid sand filtration. One thing unclear is the effect of membrane molecular weight cutoff (MWCO) on particle deposit and resistance build-up on the membrane. In this paper, the authors investigated the performance of polyethersulfone (PES) membranes of three MWCO levels as 10k, 50k, and 100k Da for the filtration of kaolinite clay suspensions. A particle dispersion analyzer (PDA) was introduced to the study for monitoring the variation of particle concentration in the concentrate. Using the PDA online monitoring data and conducting mass balance analysis of particles in the UF filtration system, the deposit weight on the membrane surface was calculated. Analysis was further conducted on the relationship between the unit surface deposit weight and resistance build-up on the membranes of different MWCOs according to Darcy's law and using flux data. As a result, a PES membrane of smaller MWCO was found to accumulate larger quantity of deposit per unit permeate volume than that of larger MWCOs. Furthermore, with the same weight of membrane deposit, higher hydraulic resistance was built up on smaller MWCO membrane than the larger ones. The PDA online monitoring technique provided a new approach for the study of membrane fouling by suspended particles.