Preparation of a zeolite 4A loaded polyether block amide membrane and usage for seawater desalination

In this study, it was aimed to remove all hydrated ions and chemicals from the seawater by using pervaporation technique. For this purpose, polyether block amide membrane was prepared. The model saline water and the real seawater desalination experiments were performed with temperature ranging from 30 °C to 60 °C using different amount of zeolite loaded membranes. The performance of the experiments were evaluated as function of water flux and salt rejection. The ion concentration of the desalinated water were analyzed using Inductively Coupled Plasma–Mass Spectrometer (Perkin Elmer Elan DRC-e ICP-MS). In conclusion, the highest salt rejection of %99.78 and a flux of 3.43 kg/m2.h were obtained using 30 wt. % of zeolite 4A loaded membrane when the model NaCl-water solution was desalinated at 40 °C. In the case of the real seawater experiments, 10 wt. % zeolite 4A incorporated membrane gave the highest rejection of %99.85 with a flux of 4.61 kg/m2.h at 40 °C. When the ICP analysis was evaluated, it was seen that the 10 wt. % zeolite incorporated membrane was very effective to separate hydrated ions, heavy metals from the seawater. When the all results were considered, contaminant concentration in desalinated water was found to be low to meet with drinking and irrigation water standards.

Deniz suyundan saf su eldesine yönelik zeolit 4A katkýlý polieter blok amid membran hazýrlanmasý ve desalinasyon uygulamasý

Bu çalýþmada, gözeneksiz zeolit 4A katkýlý polieter blok amid membraný hazýrlanarak, pervaporasyon tekniði ile tuzlu su ve deniz suyundaki tüm çözünmüþ iyonlarýn ve kimyasalarýn yüksek oranda sudan ayrýlmasý amaçlanmýþtýr. Bu amaç doðrultusunda, farklý oranlarda zeolit eklenen membranlarýn, önce laboratuvar ortamýnda hazýrlanan tuzlu sular ile, ardýndan da gerçek deniz suyu ile farklý sýcaklýklarda (30-60 °C) desalinasyonu yapýlarak sistem performansý aký ve tuz tutma oranýnýn fonksiyonu olarak deðerlendirilmiþtir. Ayrýca saflaþtýrýlan sularýn kimyasal madde içerikleri Ýndüktif Eþ Plazma Kütle Spektrometresi (Perkin Elmer Elan DRC-e ICP-MS) ile analiz edilmiþtir. Deneyler sonucunda, NaCl-su çözeltisi ile yapýlan saflaþtýrma iþleminde en yüksek aký ( 3.43 kg/m2.h) ve tuz tutma oraný (%99.78) %30 zeolit yüklemeli membran ile elde edilirken, deniz suyu desalinasyonunda %10 zeolit 4A katkýlý membran ile diðerlerine oranla daha yüksek aký (4.61 kg/m2.h) ve tuz tutma oraný (%99.85)40 °C sýcaklýkta elde edilmiþtir. ICP sonuçlarý deðerlendirildiðinde, %10 zeolit katkýlý membranýn çözünmüþ tuzlarýn yanýsýra, arsenik, kadmiyum ve civa gibi aðýr metallerin sudan ayrýlmasýnda oldukça baþarýlý olduðu ve tüm element konsantrasyonlarý deðerlendirildiðinde üretilen membran ile saflaþtýrýlan suyun hem sulama suyu hem de içme suyu limit deðerlerinden çok daha düþük deðerlerde kimyasal içerdiði görülmüþtür.