用于脈沖電場滅菌的微系統(tǒng)的研究
[Abstract]:In recent years, with the deterioration of the water environment and the increasing demand for water quality, the sterilization of microorganisms in drinking water has become more and more important. Pulsed electric field sterilization (PEF) has become a promising non-thermal sterilization technology due to its advantages of short processing time, high energy efficiency, low temperature rise and no chemical toxic by-products. However, the traditional PEF sterilization system needs to provide pulse generators with thousands or even tens of kilovolts of high voltage, which makes the equipment cost high and limits its push. In order to solve this problem, a micro-system for pulsed electric field sterilization has been developed in this paper. The required pulse voltage can be greatly reduced by reducing the electrode spacing.
In order to understand the sterilization process of pulsed electric field and compare with the development of ELECTROPULSED sterilization micro-system, the traditional pulsed electric field sterilization system was used to carry out experimental research. Pressure can achieve better sterilization effect.
Then, a flexible microchip suitable for pulsed electric field sterilization was developed. Three kinds of electrode structures, flat-tooth (PCT), cross-comb (ICT) and symmetrical toothed (SCT), were simulated and analyzed by COMSOL software, and two kinds of electrode structures were fabricated for experimental research. The experimental results show that the electrode structure will affect the sterilization effect, and the PCT structure is better than the ICT structure, which is consistent with the simulation results. At the same time, high field strength, wide pulse width, long treatment time, simple composition buffer, bacteria in the early growth state can enhance the sterilization effect. In addition, the processing chamber based on microchip can enrich bacteria to the bacteria by dielectric electrophoresis force. High field strength area and better sterilization effect.
Finally, the static and continuous micro-gap plate electrode processing chamber was developed, and the pulsed electric field sterilization micro-system was set up to carry out the relevant sterilization experiments. The experimental results showed that the sterilization effect of static sterilization system of copper electrode under the conditions of voltage 360V (electric field 20kV/cm), pulse width 50us, pulse interval 200ms, 50-100 pulses. Good; for the continuous sterilization system with copper electrode, the electrical parameters remain unchanged, and the flow rate is controlled at about 200 mu L/min, which also achieves good sterilization effect.
【學(xué)位授予單位】:重慶大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2012
【分類號】:R123.1
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