تقليل تلوث غشاء التناضح العكسي باستخدام (Kinetic Degradation Fluxion Media)
Reverse osmosis membrane fouling reduction using Kinetic Degradation Fluxion
روان نزار محمود ابوعيشة
rawan nezar M abuaysha
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Nowadays reverse osmosis is one of the most used technologies for water treatment and it is a favored method for potable water production from seawater. However, membrane fouling is a critical problem associated with Reverse Osmosis (RO) plants, since it has many negative impacts on RO efficiency, effectiveness and operation costs. Moreover, membrane cleaning techniques used to overcome fouling reduce the membrane life time, and sometimes it damage the membrane, also these techniques may create environmental issues related to the waste chemical disposal. In this study the effectiveness of applying Kinetic Degradation Fluxion (KDF) as pretreatment step for reducing fouling caused by scaling and high dosage of Cl2 in RO system was investigated. Each test was carried out using two membranes, reference or control membrane in which feed solution moved directly inside without passing through the KDF media (RO-only), and pretreatment membrane with feed solution passing through KDF media (RO-KDF). Positive results were obtained in Cl2 experiments, comparing the two systems after 41 running hour’s with high chlorinated feed solution shows that RO-KDF system was operating with full capacity, in terms of salt rejection and permeate flow, while saltrejection and permeate flow in RO-only system indicates that the membrane was degraded due to Cl2 oxidation. The effectiveness of KDF media in Cl2 removal was 73- 100%, one disc of KDF media was enough to filter 1237L of high chlorinated feed solution then it is able to extend the lifetime of TW30-1812-50 FILMTEC™ RO membrane once, therefore the applied KDF media can be considered as effective pretreatment method for Cl2 reduction in RO system.In scaling reduction experiments the operating performance parameters in the RO-KDF system was better than that in RO-only system, so after 40 running hours the salt rejection in RO-KDF system was 96.8% and the permeate flow reduction was 16%, while it was 94.1% and 41% respectively in RO-only system. However, the applied KDF media cannot be considered as an effective method for scaling reduction since 10 discs of KDF media were fully oxidized and degraded after filtering 1349L, and these 10 discs increase the lifetime of TW30-1812-50 FILMTEC™ RO membrane only once..