Seawater desalination pretreatment with low pressure membranes:New developments
This paper describes the development of low pressure membranes as pretreatment for seawater desalination systems.This development occurs in steps.Initially improvements were being made in overall process set up of the desalination plant.This paper gives two examples of ultrafiltration pretreatment systems: one of the first generation and one with an improved process design.Operational data of both plants are presented.Both ultrafiltration plants employ identical membranes.Therefore the permeate quality of both systems is identical.Results of these plants indicate that large organics will pass the UF barrier.These organics can foul the downstream SWRO system.Especially during Harmful Algae Blooms (HAB,s or Red Tides) elevated levels of organics will occur.These organics can be characterized by either monitoring Transparent Exopolymer Particles (TEP s) or quantifying the level of biopolymers in Liquid Chromatography - Organic Carbon Detection (LC-OCD).It is hypothesized that ultrafiltration with smaller pore size (tight UF) will remove a larger portion of these organics,thus reducing the fouling of spiral wound RO membranes.This paper describes pilot testing that confirms this hypothesis.A newly developed UF membrane with a pore size one order of magnitude smaller than the current state of the art ultrafiltration membranes has been piloted,both during normal conditions as well as during HAB s.This tight ultrafiltration membrane does remove the dissolved organics without the need for additional systems such as DAF.
Frans Knops Remon Dekker Bastiaan Blankert
Pentair X-Flow, 7500 AS Enschede, The Netherlands
国际会议
2013青岛国际脱盐大会(Qingdao International Conference 2013 on Desalination and Water Reuse)
青岛
英文
25-30
2013-06-25（万方平台首次上网日期，不代表论文的发表时间）