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Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE (ENGLISH)   Fall 2003 , Volume 14 , Number 4; Page(s) 175 To 180.
 
Paper: 

CLEANING OF RO MEMBERANES

 
 
Author(s):  MOHAMMADI T., KAZEMI MOGHADAM M., MADAENI S.S.
 
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Abstract: 
In this paper, results obtained from investigations on a typical reverse osmosis (RO) membrane fouled by precipitation of materials which exist in water are presented. In these studies, effect of different cleaning agents on recovery of the fouled membrane has been shown. Results show that a combination of sodium dodecyl sulfate, Na-EDTA and sodium hydroxide must be used as a cleaning material to reach the optimum recovery of the polyamide membrane employed in petrochemical industries. It was found that cleaning efficiency depends on type of the cleaning agent and its concentration. It has been shown that the efficiency increases with increasing the concentration of cleaning agent and reaches to a maximum value. The concentration that provides the highest cleaning efficiency can be considered as the optimum concentration. This depends on the type of cleaning agent. Operating conditions such as cross flow velocity, turbulence in the vicinity of the membrane surface, temperature, pH and cleaning time also play an important role in the cleaning processes. membrane cleaning requires deep understanding of the interactions between the foulants and the membrane as well as the effect of the cleaning procedure on deposit removal. In this paper the mechanism of deposit removal is also investigated.
 
Keyword(s): MEMBRANE, FOULING, CHEMICAL CLEANING, REVERSE OSMOSIS, RESISTANCE REMOVAL, FLUX RECOVERY
 
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