Description
In this research, membrane life-time is evaluated by means of accelerated ageingexperiments. In the performed experiments three main ageing factors are varied, namelymechanical stress (back-pulsing), chemicals exposure (cleaning with oxidativechemicals) and the membrane fouling status. A pressure-pulse-unit (PPU) was used tosimulate standard membrane operation in an accelerated way. The PPU can be used toback-pulse cleaning agents with a frequency of around twenty to thirty times per minutethrough a membrane module. During the back-pulses, the membranes are frequentlytested for integrity by means of permeability measurements, pressure decay test andbubble tests. The magnitude of a pressure pulse, the concentration of cleaning agent andthe fouling status of the membrane were varied. The outcomes of the experiments showthat the membrane fouling status is a major ageing factor. Clean membranes easilywithstand 300.000 back-pulses with 1000 ppm NaClO at 2.0 bars, respectively, 10 yearsof operation and 350.000 ppm.h sodium hypo chlorite exposure. The collected data willbe used in the further development of a mathematical membrane-life-time model thatpredicts the probability of membrane failure. Includes 17 references, table, figures.
Product Details
- Edition:
- Vol. – No.
- Published:
- 03/01/2007
- Number of Pages:
- 10
- File Size:
- 1 file , 340 KB
- Note:
- This product is unavailable in Ukraine, Russia, Belarus
