The quantitative determination of biomass in a suspension by means of ultrasound velocity is a simple and on-line-applicable method. Such an ultrasonic sensor offers the advantage of being long-term stable, reliable, and sterilizable. In this paper we present sound velocity measurements made with different microorganisms. The experimental results which we have obtained with an impulse-echo method will be compared with theoretical predictions and discussed with respect to previous findings (Y. Ishimori, I.
Es wird eine Ûbersicht der bisherigen Einsåtze von Ultraschall zur Konzentrationsmessung in Flçssigkeiten vorgestellt und das Potential zur Produktçberwachung und Identifikation anhand neuer Ansåtze vorgestellt.Different approaches for the measurement of concentrations in liquids will be presented and the expected advantages of ultrasound for the process control will be demonstrated with new sensors.
Biofouling bezeichnet die unenvunschte Adhasion und das Wachstum von Mikroorganismen an Grenzflachen, wie Behalterwanden, Rohrinnenwanden und Membranflachen. In zahlreichen Untersuchungen sind die nachteiligen und kostspieligen Auswirkungen des Biofoulings auf Druckvertust, Wanneubergang, Korrosion und Permeabilitat nachgewiesen worden [l]. Bislang
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