To provide a method for saving a supply water and a deodorizer of a garbage vacuum dryer.

The vacuum apparatus comprises a cooling tank, a gas-liquid separator, a vacuum pump and a check valve. That is, (a) a drying vessel is connected to the gas-liquid separator; the gas-liquid separator is connected to the cooling tank and the check valve, and the check valve is connected to the cooling tank through the vacuum pump. (b) A foam water tank and an oil tank are integrally provided respectively at the top and the bottom of the cooling tank. (c) A waste water inlet is provided in the top and a waste water outlet is provided in the bottom of the foam water tank to connect them to the gas-liquid separator. An exhaust hole is provided on a lid at the upper part of the foam water tank, the gas-liquid separator is provided in the bottom of the lid, and a foam plate is provided in the bottom of the gas-liquid separator. (d) An oil-gas inlet is provided at the upper part and an oil outlet is provided in the middle of the oil tank to connect them to the vacuum pump. A waste water outlet is provided in the bottom of the oil tank. An oil-gas separator is provided in the top of the oil tank, and an oil-water partition plate is provided in the top of the oil-gas separator. The oil-water partition plate is provided with a means for communicating with the foam tank to the oil tank and shutting off the waste water.

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