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Experimental Study of Sterilization on E.Coli with High Voltage Electrostatic and Micro-Electrolysis

Author: LiBing
Tutor: MaZhongFang;ChenYongChang
School: Beijing University of Technology
Course: Environmental Engineering
Keywords: High voltage electrostatic field Microelectrolysis E. coli Bactericidal properties Water Treatment
CLC: X703
Type: Master's thesis
Year: 2007
Downloads: 179
Quote: 1
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Abstract


High pressure the electrostatic and microelectrolysis are recent years developed a new water treatment technology, these techniques are usually set anti-fouling, corrosion inhibition, sterilization-in-one, and the effectiveness of environmental protection, energy saving. So has become a hot research at home and abroad competing. In this paper, the high-voltage electrostatic field and micro-electrolysis technology role in the killing of E. coli under static conditions, and voltage, conductivity and electrode materials of microelectrolysis sterilization and dynamic conditions microelectrolysis The sterilization experiments compared under static and dynamic conditions microelectrolysis explore the mechanism of the bactericidal effect of inactivated E. coli. The results show that under static experimental conditions, the high-voltage electrostatic field a certain role in the killing of E. coli, but a longer duration of action and the effect of instability. The bactericidal effect with the applied voltage and the treatment time is increased and enhanced, no significant effect on the water sample conductivity changes of the bactericidal effect. Adding a certain amount of chlorine ions on the bactericidal properties of the high voltage electrostatic enhanced action. In comparison, the micro-electrolysis for E. coli have a significant role in the killing, sterilization effect is enhanced with the voltage, the chloride ion concentration increases, the lower bacteria concentration, the longer the processing time, the treatment effect is more obvious. Another study of micro-electrolysis bactericidal effect of different electrode materials titanium electrode and graphite electrode. The results showed that the titanium metal electrode on Escherichia coli killing effect superior to the graphite electrode. In addition, the use of dynamic experimental methods, research microelectrolysis inactivation of E. coli in aqueous solution under conditions of flow pattern. Respectively processed by way of two cycles: once through the water processor and the loop processing in the entire system. The results show that the bactericidal properties of voltage and treatment time proportional relationship, the sterilization effect is remarkable, in a solution containing a certain amount of chlorine ions, can have significantly improved bactericidal effect of micro-electrolysis. Time after the passage of the sterilization rate can reach 100%. Finally, the use of dynamic dirt monitoring laboratory bench to do the experiments under conditions of simulated industrial circulating water, to study the combined effects of micro-electrolysis of circulating water, dirt and bacteria. The results show that the fouling and microbial growth of the micro-electrolysis method for the circulating water has a significant inhibitory effect. Can be used in industrial circulating cooling water treatment.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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