UF submerged membranes

Another possible application of ZeeWeed organic polymeric membranes is in the production of drinking water from sea water/rivers/lakes etc., where a high level of control over the quality of the permeate intended for human consumption is necessary. Ultrafiltration in this case it carries out a fundamental refinement treatment to remove suspended solids and bacteria before sending the water to the final polishing stage (activated carbon/UV) and then to the distribution network or RO sections (Reverse Osmosis).

ZeeWeed 1000 membranes for potable applications are ideal for retrofitting existing sand/carbon filters for medium to large systems; the PVDF membrane in this case is an immersed self-supporting extruded membrane that works in OUT-IN mode, i.e. the direction of filtration goes from the outside of the hollow fiber towards the inside in such a way that the suspended solids remain outside the membrane while only the permeate (clarified water) reaches the internal channel of the fiber (lumen) from where it is then collected and conveyed towards the final discharge.

The membrane is organized into modules which in turn are combined to form an ultrafiltration cassette equipped with different blocks capable of reaching the required surface. It is possible to ensure high removal of pathogens such as Giardia and Cryptosporidium and achieve effluent turbidity of less than 0.1 NTU.

Main features:

• Compact system with high packing density capable of developing large filtration surfaces in a small space
• The configuration of the cassettes in blocks allows for a high degree of customization and the possibility of adapting to different volumes of existing artefacts
• Very suitable for the retrofit of old sand or activated carbon filters that work by gravity
• Very low energy consumption compared to pressurized solutions
• They have been widespread for over 20 years and therefore the reliability of this technological solution is now proven by thousands of references
• They have one of the longest expected lifespans among the products offered on the market (> 10 years)