Details

Autor(en) / Beteiligte

• Pype, Marie-Laure
• Donose, Bogdan C.
• Martí, Llucia
• Patureau, Dominique
• Wery, Nathalie
• Gernjak, Wolfgang

Titel

Virus removal and integrity in aged RO membranes

Ist Teil von

• Water research (Oxford), 2016-03, Vol.90, p.167-175

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2016

Quelle

MEDLINE

Beschreibungen/Notizen

• Membrane ageing reduces the quality of the filtered water. Therefore, in order to warrant public health, monitoring membrane performances are of utmost importance. Reverse osmosis (RO) membranes are generally used to remove viruses and salt. However, there is no detailed study demonstrating the impact of aged membrane on the rejection of viruses and of membrane integrity indicators. In this paper, the impact of hypochlorite induced RO ageing on the rejection of a virus surrogate (MS2 phage) and four membrane integrity indicators (salt, dissolved organic matter, rhodamine WT and sulphate) was evaluated. Hypochlorite exposure was either active (under filtration) or passive (soaking), and the changes of the membrane surface chemistry were characterised using several autopsy techniques. Under this accelerated ageing condition, the introduction of chlorine in the membrane chemistry and the breakage of amide bonds caused an increase of the water permeability and a decrease of the virus surrogate's and indicators' rejection. Ageing resulted in a more negatively charged membrane and also in a higher hydrophobicity, which lead to the adsorption of MS2 phage. Despite severe physical membrane damage leading to a reduction of salt rejection to 1.2 log (94%), the minimum rejection of MS2 phage stayed on or above 4 log. [Display omitted] •Membrane surface chemistry changed after a contact time of 9000 ppm h NaOCl at pH 7.•The introduction of chlorine caused an increase of the water permeability.•Chlorine attack caused a decrease of MS2 phage and other compounds rejection.•Aged membrane facilitated the adsorption of MS2 phage.•The rejection of MS2 phage was still of 4 log despite the strong membrane damage.