Sterilization Characteristics of Ozone-mist Spray for Chemical Free Agriculture

K. Ebihara^1,2 F. Mitsugi², T. Ikegami², Y. Yamashita³, Y. Hashimoto³, T. Yamashita³, S. Kanazawa⁴, H. D. Stryczewska⁵, J. Pawlat⁵, S. Teii⁶, and T.-L. Sung⁶

¹ Environment and Energy Laboratory, Japan
² Department of Computer Science and Electrical Engineering, Kumamoto University, Japan
³ Sanwa hi-tech Co. Ltd, Japan
⁴ Department of Electrical and Electronic Engineering, Oita University, Japan
⁵ Lublin University of Technology, Poland
⁶ Lunghwa University of Science and Technology, Taiwan

Abstract

We have developed an ozone-mist spray system for chemical free agricultural sterilization. This environmentally friendly system is the movable and backpack type in which the high density ozone is generated by surface dielectric barrier discharge in oxygen. The ozone gas is injected into the water-mist which is produced by the water spray nozzle. The ozone-mist is sprayed over harmful insects, viruses and bacteria living on/in the plants. The ozone solubility of the ozone-mist water is over 5ppm in the case of standard treatment conditions (oxygen flow rate 1 L/min, mist water flow rate 0.3 L/min). Many kinds of harmful insects were sterilized to evaluate the sterilization characteristics and operation management by changing conditions such as ozone concentration, oxygen flow rate, mist water flow rate, distance between nozzle and biological objects using various structures of the spray nozzle system. Typical experiment shows that the survival rate in the case of aphids (small insects of a few mm size) becomes practical value of about 10% for very short spray time of 10 sec.

Keywords - Ozone-mist, sterilization, spray, chemical-free, harmful insect

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