화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.51, No.20, 7056-7066, 2012
Kinetic Study and Scaleup of the Oxidation of Nanofiltration Retentates by O-3
This paper reports on the upscaling of an O-3 reactor for the oxidation of natural organic matter. Natural organic matter is responsible for fouling of nanofiltration membranes used for drinking water production. The proposed concept is to feed the retentate stream of a nanofiltration module (400 m(3) h(-1)) to an O-3 reactor (bubble column) and subsequently recycle it to a second nanofiltration module. The O-3 oxidation of the retentate stream in the bubble column is analyzed in terms of the two-film theory with mass transfer and chemical reaction. The kinetic regime of the ozonation process, i.e., the chemical reaction rate relative to the mass-transfer rate, is determined using data from laboratory-scale experiments. This information is used for the calculation of the reactor volume and the required O-3 dose on an industrial scale. An economic assessment of the integrated nanofiltration-O-3 oxidation process also is given.