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These parameters must always be considered when a raw water analysis is taken.
Despite the larger pore size, microfiltration membranes actually have a higher tendency to fouling than ultrafiltration membranes. Tiny particles remain blocked in the pore channels (Pore Blocking), whereas in ultrafiltration they would remain above the filter layer.
A Membratec ultrafiltration plant normally has systems for backwash, recirculation (Cross-Flow, Forward-Flush), disinfection, and chemical cleaning, as well as other sequences which can guarantee a reliable and fully automatic operation even in case of bad quality raw waters.
In reverse osmosis and nanofiltration membrane blockage tends to occur in the form of inorganic deposits or “Scaling”. Since reverse osmosis and nanofiltration membranes are produced as flat sheets rolled up in a spiral shape, their use is even more delicate. Excessive mineral saturation on the concentrate side can be controlled by adding complexing agents. In order to avoid particle blockage in the water transporting spacers, the raw water must have a very low turbidity (< 1 NTU). |
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