Submerged ultrafiltration membranes

Another possible application of the ZeeWeed organic polymeric membranes is in the production of drinking water starting from sea water/rivers/lakes etc., in which a high level of control on the water quality is required for human consumption. Ultrafiltration in this case carries out a fundamental polishing stage able to remove suspended solids and bacteria before sending the water to furthers polishing stage (activated carbon/UV) and then to the distribution network or to RO sections (reverse osmosis). ZeeWeed 1000 membranes for drinking water applications are ideal for retrofitting existing sand/carbon filters for medium and large plants; the PVDF membrane in this case is submerged self-supporting extruded membrane that works in an OUT-IN mode: i.e. the direction of filtration goes from the outside of the hollow fiber towards the inside so 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 sent to the final discharge.

The membranes are grouped in modules which  located in a ultrafiltration cassette  equipped with different blocks capable of reaching the required surface. It is possible to ensure a high removal of pathogens such as Giardia and Cryptosporidium and achieve a turbidity in the effluent of less than 0.1 NTU.

Main features:

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

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