Low-pressure desalination membranes with improved and more robust chemistry, plus a new spacer geometry, have been introduced by Hydranautics of California, USA, under the brand LD (Lower Differential pressure) Technology™.
The technology, which is employed for two new spiral-wound brackish-water modules, CPA5-LD and ESPA2-LD, is said to lengthen element life, reduce chemical and labor costs associated with membrane cleaning, and reduce system downtime.
LD Technology is a culmination of new advancements in biofouling and colloidal fouling reduction, and in the cleanability of spiral elements. It comprises improved, more robust polyamide chemistry, innovative spacer geometry design to minimize the trapping of small colloidal particles, and enhanced chemical properties to minimize the proliferation of bacteria in the element.
In a recent plant study, the CPA5-LD had approximately 2 bar lower differential pressure (1 bar versus ~3 bar) for most of the 250-day test, compared with conventional elements. Additionally, the number of Clean in Place (CIP) cleanings was drastically reduced, from 5 to 0.
The technology is enhanced with the new HYDRAblock™ antimicrobial technology, which further reduces the ability of bacteria to populate the spiral-wound element.
In an additional plant trial where biofouling was a persistent problem, LD Technology™ resulted in considerably lower rise in differential pressure (Δp). During the biofouling event, the differential pressure of the spiral elements with LD Technology™ had only one third of the Δp rise compared to the conventional spiral-wound element.
The improved robustness of the LD Technology™ allows aggressive cleaning for elements treating very difficult feedwaters. The CPA5-LD and ESPA2-LD can be cleaned at pH from 1 to 13, depending upon cleaning conditions, while its robustness under aggressive cleaning conditions ensures that membranes can be restored to their best possible performance, making them ideal for difficult RO applications.
For more information contact: Hydranautics
Tel: +1 800 CPA PURE or +1 760 901 2500
Email: [email protected]
Web: www.membranes.com .