Abstract: An underwater-cooling water-temperature maintaining apparatus of a food includes: a water tank where a cooled stuff and cooling treated water of which a freezing point is not more than zero Celsius degree; a treated water cooler configured to cool the cooling treated water; a water temperature detection sensor configured to detect a water temperature of the cooling treated water; an agitator pump configured to equalize the water temperature of the cooling treated water in the water tank; ultrasonic vibrators configured to oscillate ultrasound toward an inside of the water tank in order to prevent the cooled stuff from being frozen; and a controller configured to control the ultrasonic vibrators, the water temperature detection sensor, the treated water cooler, and the agitator pump so as to maintain the water temperature of the cooling treated water at a temperature at which the cooled stuff is not frozen.

Abstract: A freezing and thawing apparatus includes a freezing and thawing treatment tank for filling freezing and thawing treated water, a plurality of ultrasonic vibrators for oscillating ultrasound different in frequency in the freezing and thawing treatment tank, a treated water cooler for cooling the freezing and thawing treated water, and an ultrasonic vibrator controller for controlling the ultrasonic vibrators.

Abstract: An underwater ultrasonic thawing apparatus includes a thawing treatment tank where thawing treatment water; an underwater ultrasonic vibrator configured to be fixed to an inner face of the thawing treatment tank and to emit ultrasound; a temperature sensor configured to detect a temperature of the thawing treatment tank; a temperature adjuster configured to adjust the thawing treatment water to a predetermined temperature; a controller configured to control the underwater ultrasonic vibrator; and a separation and hold means configured to separate and hold a stuff to be thawed which is thrown in the thawing treatment tank and the underwater ultrasonic vibrator.

Abstract: An underwater thawing and freezing device includes: a thawing and freezing tank for containing therein ethyl alcohol water as a thawing and freezing liquid; a plurality of wave motion piezoelectric vibration elements for generating wave motions in the thawing and freezing tank; a temperature control unit for controlling a temperature of the ethyl alcohol water at a predetermined temperature, the temperature control unit having a temperature sensor for detecting the temperature of the ethyl alcohol water; and a control unit for controlling the wave motion piezoelectric vibration elements. The plurality of wave motion piezoelectric vibration elements generate wave motions at a plurality of different frequencies. The wave motions travel at an angle of an about 10 degrees inclined from a vertical line from a surface of the thawing and freezing tank, on which the respective wave motion piezoelectric vibration elements are provided.

Abstract: Wet refuse together with some amount of water may be deposited through a drain port of a sink tub in a common household. The wet refuse is then comminuted into finely divided pieces in a fully automatic manner by a wet refuse crusher without the need for any manual operation, and charged, together with water, into a wet refuse disposer containing a bed or matrix of particulate material loaded with microorganism such as soil bacteria capable of decomposing organics where all of the wet refuse is decomposed and consumed in at most about half a day as the finely divided pieces of wet refuse have tens or hundreds of times as great surface area as the wet refuse in its original form. The water entrained with the wet refuse is passed and discharged through the particulate bed material having a filtering function.