Abstract
This paper describes the development of an inexpensive electropositive filter capable of adsorbing enteroviruses from waters at pH 5 to 9. We have previously reported that electronegative microporous filters composed of epoxy-fiberglass (Filterite) treated with the cationic polymers polyethylenimine (PEI) and Nalco 7111 cationic polymer (Nalco) were found to adsorb a greater percentage of enteroviruses and indigenous bacteriophages from water than untreated filters (Preston etal. 1988). However, no single polymer treated filter was capable of adsorbing poliovirus type 1 from buffer pH 5, 7, and 9. When PEI and Nalco 7111 cationic polymer treated filters were combined as a series of different filters or on the same filter, Poliovirus-1 was subsequently removed from buffer at pH 5, 7, and 9. Filterite filters modified with a combination of PEI and Nalco polymers were found to adsorb echovirus type 1, echovirus type 5, coxsackievirus type B5, and poliovirus type 1 from tap water at least as well as Virasorb 1-MDS microporous filters.
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