A hybrid flotation-microfiltration cell for effluent treatment
Air bubbling is one of the techniques used to limit membrane fouling. Under appropriate conditions, it could be used also as the transport means for flotation, which is another efficient separation method applied in water treatment. The aim of the present paper was to review (in short) the integration in the same tank of both processes, taking advantage of dispersed-air flotation combined with microfiltration by submerged membranes. Process parameters investigated were: the nature, size, and concentration of solid particles (zeolite, hydrotalcite, zinc hydroxide and iron colloidal particles), the type and concentration of selected ions (Zn2+, P-PO43-), the effect of gas flow rate, the frequency and length of backflushing, which was required in order to reduce the fouling of membranes.
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