An innovative integrated system for boron removal from geothermal water using RO process and ion exchange-ultrafiltration hybrid method

In this study, removal of boron from the geothermal water was investigated by an integrated process coupling reverse osmosis (RO) with ion exchange-ultrafiltration hybrid method. Desalination tests were performed by using a mini-pilot scale brackish water reverse osmosis (BWRO) system which was installed at Yenikale Geothermal Heating Center, Izmir. Boron selective chelating ion exchange resin Dowex (XUS 43594.00) with a particle size of 20 mu m was employed for removal of boron from BWRO permeate of geothermal water. A submerged hollow fiber type ultrafiltration membrane module (ZW-1) was used for filtration. Effect of such process variables as resin concentration in the suspension, flow rates of fresh and saturated ion exchange resins, and flow rate of permeate on the efficiency of the hybrid process for boron removal from RO permeate of geothermal water was studied. (C) 2013 Elsevier B.V. All rights reserved

Kolloidal sistemli su kirliliklerinin giderilmesinde kimyasal çöktürme (yumaklaştırma) işleminin uygulanması

Chemical precipitation and flocculation processes is widely used in water treatment operations. In chemical precipitation processes, water treatment is provided by holding of colloidal pArticles in precipitate. During this operation, a chemical used as flocculant can be added to waste water in order to get precipitation processes quickly. In addition to getting quick precipitation, precipitate with large pArticle size is obtained after the flocculation processes and this parjicles can be removed easily by filtration. Whatever the waste water have different characteristic, determination of the amount of chemical that will be used in treat;not;ment is needed to laboratory studies. In this study, a laboratory work which is carried out in order to remove the colloidal pollutant in waste water of gas stations and motor cleaning units is presented and a suitable method that will be easy applicable such as units is offered.Kimyasal çöktürme ve yumaklaştırma atık su arıtma işlemlerinde yaygın olarak kullanılan yöntemlerdendir. Kimyasal çöktürme işleminde çözeltide bulunan kolloidal tanecikler çökelek içinde hapsedilerek temizleme sağlanır. Bu işlem esnasında, oluşan çökeleğin hızlı çökebilmesi için, ortama yumaklaşmayı sağlayıcı bir kimyasal madde ilave edilebilir. Böylece daha hızlı çökelme sağlanabileceği gibi yumaklaşma sonrası irileşen taneciklerin filtrasyon ile ayrılması kolaylaşır. Atıksuyun özelliği ne olursa olsun gerekli optimum kimyasal madde ilavesi ve gerçekleştirilecek süreçlerin belirlenmesi laboratuvar çalışması gerektirir. Bu çalışmada benzin istasyonları ve motor yıkama ünitelerinde oluşan atıksulardaki kolloidal kirliliklerin giderilmesi amacıyla gerçekleştirilmiş laboratuvar çalışmaları sunulmakta ve bu tür kirliliklerin oluştuğu birimlerde kolayca uygulanabilecek bir yöntem önerilmektedir