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Air sparging backwash in ultrafiltration hollow fibres for drinking water production
Air sparging was applied to improve backwash efficiency for an ultrafiltration inside/out hollow-fibre module operating in dead-end mode. Air was injected into the retentate side only during the backwash period. The filtration experiments were performed on a semi-industrial scale pilot using a clay suspension as a model of surface waters. The backwash procedure consisted in two steps: in a first step (phase A), air was added to the feed water inside the fibre lumen at the bottom of the module. In a second step (phase B), cleaned water backwash was performed. Different air velocities were used and the kinetics of particle removal were studied with turbidity measurements of backwash waters. The experimental results showed that using an air-fluid mixing allows to increase the quantity of particles removed from the hollow fibres. For the phase A, the removed mass is higher when the air velocity and duration of air injection increased. But, even at very low filtration / air-sparging backwash cycles concluded that using air-fluid mixing in the backwash sequence allowed to prevent long-term fouling and to reduce the rate of fouling during the filtration. In comparison with conventional backwash without air, the improvement of particle removal varied form 30 % to 130 % depending on the operating conditions. The energy consumption for the air sparging backwash is in the same magnitude than energy consumption in the conventional backwash and the value is not dependent on the superficial air velocity.
Air sparging backwash in ultrafiltration hollow fibres for drinking water production
Air sparging was applied to improve backwash efficiency for an ultrafiltration inside/out hollow-fibre module operating in dead-end mode. Air was injected into the retentate side only during the backwash period. The filtration experiments were performed on a semi-industrial scale pilot using a clay suspension as a model of surface waters. The backwash procedure consisted in two steps: in a first step (phase A), air was added to the feed water inside the fibre lumen at the bottom of the module. In a second step (phase B), cleaned water backwash was performed. Different air velocities were used and the kinetics of particle removal were studied with turbidity measurements of backwash waters. The experimental results showed that using an air-fluid mixing allows to increase the quantity of particles removed from the hollow fibres. For the phase A, the removed mass is higher when the air velocity and duration of air injection increased. But, even at very low filtration / air-sparging backwash cycles concluded that using air-fluid mixing in the backwash sequence allowed to prevent long-term fouling and to reduce the rate of fouling during the filtration. In comparison with conventional backwash without air, the improvement of particle removal varied form 30 % to 130 % depending on the operating conditions. The energy consumption for the air sparging backwash is in the same magnitude than energy consumption in the conventional backwash and the value is not dependent on the superficial air velocity.
Air sparging backwash in ultrafiltration hollow fibres for drinking water production
Rückspülung mit Lufteinblasung bei Hohlfaser-Ultrafiltration für die Trinkwasserproduktion
Guigui, C. (author) / Mougenot, M. (author) / Cabassud, C. (author)
2002
9 Seiten, 7 Bilder, 20 Quellen
Conference paper
English
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