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Abstract
This paper presents synthesis and performance of polyamide forward osmosis (FO) membrane for humic acid (HA) removal. Three polyamide membranes were synthesized by reaction between m-phenylenediamine and trimesoyl chlorideat different reaction times (10, 30 and 60 s). Five different concentrations of sodium chloride draw solutions and 15 mg/L of HA solution as feed solution were tested in one hour to obtain water flux, reverse salt diffusion and HA removal. Reverse salt diffusion and HA removal were measured using conductivity and a UV–vis spectrometer, respectively. Overall, membranes modified for longer reaction times (30 and 60 s) exhibited good performance in term of moderate flux, higher HA removal and low reverse salt activity. In addition, it was found that higher concentration of draw solution leads to lower HA rejection and higher reverse salt diffusion, which indirectly represented overall membrane performance.
Acknowledgement
The research work was financial supported through Ministry of Higher Education research grant (FRGS) RDU 120108. Appreciation is also expressed to the Ministry of Higher Education of Malaysia for supporting this study (MyBrain15). The authors are thankful to all technical staffs, Chemical Engineering Research Laboratory of Universiti Malaysia Pahang for providing the necessary facilities, constant guidance and encouragement.
Notes
Presented at The 2nd IWA Malaysia Young Water Professionals Conference 2015 (YWP15) Aspiring Beyond Water Solution, March 17–20, 2015, Langkawi Island, Malaysia