Abwasserentkeimung mit Hilfe des 'Schockeffektes' Abschlussbericht

Shock effects by simultaneous ultrasonic and salt water treatment have been studied for reduction of bacteria concentration in biologically purified waste water. Ultrasonic treatment was carried out at 206, 352, 618 and 1.042 MHz in the ultrasound reactor URS 1000. Investigated bacteria are Escherichia coli, Enterococcus faecalis, Enterobacter cloacae and Klebsiella pneumoniae. Sterilization started only at hard cavitation which occurred after a 10 - 50 min starting phase in the ultrasonic treatment. Sterilization strongly depends on the frequency with an optimum at 352 MHz. Deviation of water salt concentration from physiological salt concentration results in a synergistic treatment effect. Chemical side reactions include nitrate formation and a pH decrease. Side reactions and energy consumption require additional investigations to make the combined ultrasonic/chemical treatment a competitive process of water sterilization. (WEN)SIGLEAvailable from TIB Hannover: F96B321+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman