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In 1991, after reviewing a number of approaches, ZENON determined that immersedmembranes would ultimately be the most cost effective and reliable technology for drinkingwater treatment. Immersed membranes differ from pressurized membranes in that pressurevessels are not used. Instead, shell-less hollow fibers are immersed into a tank open to theatmosphere and a gentle suction is applied to draw clean water through the fibers. Throughthe use of tanks open to the atmosphere, ZENON's immersed membrane technologyconforms to the normal manner that water plants are operated while saving the cost ofpressure vessels. Furthermore, through the use of low trans-membrane pressures (suction),ZENON was able to minimize fouling.Since 1991, ZENON has continually evolved new generations of immersed membranes. Thefirst four generations are referred to as ZeeWeed(R) 150 and ZeeWeed(R) 500 a, b, and c. Thesemembranes have been designed to handle water of almost any level of turbidity as well asvery high solids applications such as direct coagulant addition or filter backwash treatment.The ZeeWeed(R) 1000 is ZENON's fifth generation of immersed membrane technology thathas been designed for low solids feed water with the primary focus of design on minimizinglife cycle costs. The ultrafiltration membrane used in the ZeeWeed(R) 1000 system has thesame membrane chemistry and absolute pore size as its predecessors and therefore alsoremoves suspended solids, protozoa, bacteria and viruses.This paper examines the key product and operating features of the ZeeWeed(R) 1000 product.Various designs and applications of the ZeeWeed(R) 1000 membrane are presented in this paper withdata from both pilot and full-scale operations. Includes reference, tables, figures.

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Edition: Vol. - No. Published: 06/16/2002 Number of Pages: 11File Size: 1 file , 660 KB