NOVELTY - A liquid level detector (79) for detecting the liquid level in an activation tank (9) which receives water, and a liquid microorganisms formulation from a storage tank (7), is formed, such that, the liquid level to be detected by the detector, is capable of being varied. The activation tank activates enzyme of the microorganisms.    USE - For activating enzyme of microorganisms, used to decompose waste oil and proteins of plant and animal origin, which are collected from dining room, kitchen of restaurant.    ADVANTAGE - Since the liquid level to be detected by the detector, is capable of being varied, enables changing the amount of production of the water containing the enzyme of the microorganisms, using a single apparatus. Since the various segments of the case are connected detachedly, the damaged segment of the case is exchanged easily.    DETAILED DESCRIPTION - A control circuit controls the operation of a formulation supply unit (13), a water supply unit, and a heating unit (77) which heats the liquid in the activation tank, based on the output and the input set point signal of the detector. The detector has a sensor (85) which is attached to a sensor support (85) arranged in the activation tank. The position of the sensor support is capable of being changed. The apparatus has a case which is divided into upper, middle and lower segments. The control-circuit accommodation unit is stored in the upper segment, and the formulation supply unit, water supply unit, and the heating unit are stored in the middle and lower segments of the case. The upper storage space is opened/closed, such that, an operator is capable of inspecting the upper storage space, during repair/maintenance operation. The lower case segment forming the lower storage space, is detachedly connected to the upper case segment forming the upper storage space, by a detachable connector. A solenoid valve ejects the liquid from the activation tank.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the enzyme activation apparatus.    Storage tank (7)    Activation tank (9)    Formulation supply unit (13)    Heating unit (77)    Detector (79)    Sensor support (85)    Sensor (87)