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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2019.29.2.96

Restoration of Membrane Performance for Damaged Reverse Osmosis Membranes through in-situ Healing  

Yun, Won Seob (Department of Advanced Materials and Chemical Engineering, Hannam University)
Rhim, Ji Won (Department of Advanced Materials and Chemical Engineering, Hannam University)
Cho, Young Ju (Department of Advanced Materials and Chemical Engineering, Hannam University)
Publication Information
Membrane Journal / v.29, no.2, 2019 , pp. 96-104 More about this Journal
Abstract
The purpose of this paper is whether or not the in-situ restoration of the reverse osmosis (RO) membranes which its membrane function is lost is possible. The damaged RO membranes are double coated through the salting-out method by the poly(styrene sulfonic acid) sodium salt as the cationic exchange polymer and the polyethyleneimine as the anionic exchange polymer and also conducted the opposite order of the coating materials. And according to the concentration, time and ionic strength, the flux and rejection are measured for the coated membranes. Then the best coating condition is to apply for the RO membrane module of the household water purifier to know the possibility of the in-situ restoration for the commercial module. When the condition of the PEI 30,000 ppm (IS = 0.1)/PSSA 20,000 ppm (IS = 0.7) is applied, the rejection was enhance from 69% for the damaged module to 86% (90% for the pristine module).
Keywords
sodium hypochlorite; reverse osmosis membrane; polyethyleneimine (PEI); poly(styrene sulfonic acid) sodium salt (PSSA); membrane restoration;
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