How It Works
ZW 700B products use very robust ultrafiltration (UF) membrane fibers that provide an absolute physical barrier to suspended solids and ensures an optimal removal of bacteria and particulate organics. The SevenBore* fibers have a superior mechanical strength which eliminates the operational issues related to fiber breaks associated with single bore fibers.
ZW 700B is a pressurized, inside-out flow, UF membrane module. ZW 700B is a very versatile product and can be installed either in a horizontal or vertical configuration. Additionally, the membrane modules can be installed either with or without a pressure vessel. Finally, ZW 700B products are available as an RMS (rack-less membrane system) or for installation on a rack.
ZW 700B operates by feeding pressurized source water to the module and into the membrane fibers. Once inside the fibers, the pressure makes the filtered water flow (permeate) across the membrane wall and out of the module. Meanwhile, the suspended solids, microorganisms and particulate organics accumulate inside the fiber. At the end of the production cycle, the pollutants trapped inside the membrane fibers are removed by using a forward flush with feed water. Additionally, a backwash is performed to further clean the ZW 700B fibers after each production cycle. During backwash, pressurized clean water is driven across the membrane wall and into fiber. Thus, the remaining pollutants are flushed out of the module.
These cycles of filtration and backwash can be easily automated to keep operation simple and membranes operating in top form.