Dual-frequency ultrasonic washing machine for fruits and vegetables

This paper presents a fruits and vegetables washing machine using ultrasonic technology. The pesticide residues on fruits or vegetables can be peeled off by ultrasonic waves effectively. The washing machine produces two frequencies ultrasonic, 140 kHz f or washing fruits or vegetables and decomposing pesticides, 80 kHz for other cleaning such as dishes. Cleaning experiment and its results are shown in this paper.