Ultrasound based on-line cleaninf of membrane filtration of industrial wastewater was studied. An ultrasonic transducer was assembled in the membrane module in order to get and efficent cleaninf of membranes in fouling conditions. The focus of the studies was on the effects of the ultrasound propagation direction and frequency, as well as the transmembrane pressure. The more open the membrane was the easier the membrane plugged by wastewater colloids, when the ultrasound propagation direction was from the feed flow side of the membrane. If the membrane was tight enough, ultrasound irradiated from the feed side of the membrane increased the flux significantly. However, in the circumstances studied, the power intensity needed during filtration was so high that the membranes became damaged. It was discovered that the ultrasonic field produced by the used transducers was uneven in pressure conditions. Ultrasound irradiation at the input power of 120 W (power intensity 1.1 W/cm2) for few seconds was sufficient for membrane cleaning, when sonication was carried out using low frequency ultrasound (27 kHz) at atmospheric pressure.
|Title of host publication||Ultraschall in der Umwelttechnik III|
|Place of Publication||Hamburg|
|Publisher||Technische Universität Hamburg-Harburg|
|Publication status||Published - 2005|
|MoE publication type||A4 Article in a conference publication|
|Event||3. Symposium Ultraschall in der Umwelttechnik - Hamburg-Harburg, Germany|
Duration: 3 Mar 2005 → 4 Mar 2005
|Conference||3. Symposium Ultraschall in der Umwelttechnik|
|Period||3/03/05 → 4/03/05|
Kyllönen, H., Pirkonen, P., & Nyström, M. (2005). Aspect in ultrasonically enhanced cross-flow membrane filtration of industrial wastewater. In Ultraschall in der Umwelttechnik III (pp. 29-38). Technische Universität Hamburg-Harburg.