Abstract
The suitability of three different pre-treatment technologies namely powdered activated carbon (PAC) adsorption, coagulation with ferric chloride and ultrafiltration (UF) as pre-treatment to reverse osmosis (RO) desalination of a cooling tower blow down (CTBD) was investigated. Special attention was paid to the capability of the pre-treatment options to remove dissolved organic carbon (DOC) from the CTBD by applying advanced DOC characterization. Furthermore, the direct effect on the performance of reverse osmosis (RO) desalination was investigated.Advanced DOC analysis showed clear differences between the pre-treatment technologies in removal of total DOC and in removal of certain DOC fractions. By investigation of RO normalized flux decline after different pre-treatments an improvement of 10–20% by UF treatment and an additional improvement of 10–20% by PAC/UF treatment were found in comparison to RO performance on not pre-treated CTBD. The achieved results indicate the negative influence of chemical additives in the CTBD matrix on RO fouling and performance as well as pre-treatment efficiency.With PAC/UF pre-treatment resulting in the least fouling development the normalized flux decline remained high with roughly 40%–50% over 5days of RO operation indicating the challenging nature of high DOC CTBD treatment for re-use.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
