Experimental assessment of the efficacy of microfiltration and ultrafiltration for removal

1 January 1998

journal article
Published by IWA Publishing in Water Science & Technology

Vol. 38 (12) , 103-107
https://doi.org/10.1016/s0273-1223(98)00809-9

Abstract

In order to evaluate the efficacy of microfiltration and ultrafiltration for Cryptosporidium oocyst removal, a bench-scale experiment was carried out using two 0.2m² molecules, MF (nominal pore size 0.25μm) and UF (nominal cut-off MW 13,000 daltons) in cross-flow mode at an oocyst level of 10⁶/L. Both of the membranes eliminated the oocysts from the influents with removal efficiency estimated to be >7 log₁₀. As for the MF, an additional experiment was conducted at a much higher oocyst level up to 10⁸ oocysts/L in both cross-flow and dead-end modes and which achieved >7 log₁₀ removal, although some oocysts appeared in the filtrate in both modes. Based on these results, microfiltration and ultrafiltration are conclusively considered to be excellent processes for drinking water treatment as a single process that produces safe (an annual risk 10⁻⁴) water from highly polluted source waters.

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