TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The exhaust pipe is wound in a circular manner at the hemispherical shaped lower end and installed to the upper end part bottom inner side of the fermentation tank in a fixed state, where a rainwater guide is extended outwardly above the fermentation tank upper end. The aeration apparatus includes a gear housing fixed to the top inner space of the fermentation tank via a mounting part, a shaft installed to the bottom surface of the fermentation tank and the gear housing to allow rotation, and radially embedding an injection pipe to the lower part, a drive motor attached to the gear housing, for rotating the shaft by transferring the driving force to a sprocket and chain, and an air housing mounted to the upper part of the shaft and the gear housing and installed with an air supply line attached to a blower from the outside of the exhaust pipe. Multiple injection holes are formed in the lower part of the injection pipe and formed with an inlet hole at the upper end of the shaft for penetrating the injection pipe. The air housing is mounted over the gear housing such that it wraps around the drive motor and the upper end of the shaft, and an air supply line is installed to the outside of the blower. The injection pipe is installed as S shape to the lower part such that it is adjacent to the discharge groove of a transfer line from the sludge ejector. A splined shaft is provided in the upper part of the shaft, and a floating part is installed to the splined shaft such that it floats up and down according to the water level of the organic manure, where a stirring blade is attached. The sludge ejector includes a transfer line connecting from the fermentation outside to the bottom surface of the inner space, and formed with a discharge groove in the inner periphery located in the inner space of the fermentation tank, an outlet formed in the one side lower part of the transfer line and located to the outside of the fermentation tank, a drive motor installed on one side of the transfer line and located to the outside of the fermentation tank, and a disk installed to the interior of the conveying line, and bound with a wire, installed at regular intervals, for circulating along the transfer line by the operation of the driving motor. In the transfer line, the outer part located outside the fermentation tank is installed higher than the upper part of the fermentation tank. In the waste feeder, a damper is installed to the interior of an input hopper. Methane gas discharged through the exhaust pipe is stored in a storage tank via a filtration device and a liquefaction device.