Profil Filtrasi Larutan Sodium Alginat pada Modul Tunggal Cross-flow Membran Polyethersulfone

Abstract

AbstrakKajian penurunan dan rekoveri fluks pada proses ultrafiltrasi larutan natural organic matter (NOM) dengan membran polyethersulfone telah dilakukan. Larutan sodium alginate digunakan sebagai model NOM dalam air, dan profil filtrasinya dipelajari berdasarkan waktu operasi. Proses filtrasi menggunakan modul cross-flow dengan konfigurasi aliran filtrasi pressure driven outside (PDO . Larutan SA pada kondisi pH basa menghasilkan penurunan nilai fluks lebih kecil dibandingkan pada pH Asam dan netral. Rejeksi partikel SA tertinggi diperoleh pada kondisi asam menggunakan membran PES Aerosol OT yaitu sebesar 46,88%.Kata kunci : membran hollow-fiber, ultrafiltrasi, natrium alginat, Flux recovery ratio. AbstractThe study on flux reduction and recovery in the ultrafiltration of natural organic matter (NOM) by polyethersulfone membran has been done. Sodium alginate (SA) solution was used as a model of NOM in water, and its filtration performance was investigated based on operation time. Cross-flow filtration module with pressure driven outside (PDO) configuration was used in this work. The permeability profile of SA solution on polyethersulfone membran has been observed with several treatments condition, such as effects of the presence of metal ions Ca 2+ and Mg 2+ and the effect of pH of solution (acidic, basic and neutral). Polyethersulfone (PES) Membranwith Aerosol OT as additive is used to determine its performance. Flux recovery ratio (FRR) is one of indicator to determine the fouling property which is formed in membran surface. Generally, the SA solution in acidic conditions has the lowest FRR value, while the solution in alkaline conditions has the greatest FRR value. The achievement of SA solution flux with the addition of Mg 2+ ion is greater than the addition of Ca 2+ ion. On the other hand, the SA solution at alkaline pH conditions resulted in a lower flux decrease than at acid and neutral pH conditionThe SA solution at alkaline pH conditions filtrated in this work brought about in decreased flux, and the value is lower than the acid and neutral pH. The highest solute rejection was obtained up to 46,88% in case of the solution under acidic condition using PES Aerosol OTmembrane.