NOVELTY - A liquid-processing apparatus consists of a processing tank (11), micro-bubble generators (13,14), a purification tank (12) provided with a filter-medium container (12a) and a liquid supplier (17), a liquid feeder, and a recirculation unit. The filter-medium container has filter media (15,16) for purifying the liquid, and the liquid supplier supplies the liquid to the filter medium. The liquid feeder supplies the processed liquid to the liquid supplier. The recirculation unit supplies the liquid passing through the filter medium to the processing tank.    USE - Apparatus is used for processing liquids, such as waste edible oil, for manufacturing biodiesel fuel.    ADVANTAGE - The apparatus simplifies the manufacturing process of biodiesel fuel, shortens processing time, reduces energy consumption, and provides biodiesel fuel having excellent quality.    DETAILED DESCRIPTION - A liquid-processing apparatus consists of a processing tank, micro-bubble generators, a purification tank provided with a filter-medium container and a liquid supplier, a liquid feeder, and a recirculation unit. The processing tank has a container (11a) for accommodating the liquid which is a process target. The micro-bubble generator is arranged in the container to supply micro-bubbles (MB) of air and ozone to the liquid in the container. The filter-medium container has a filter medium for purifying the liquid, and the liquid supplier supplies the liquid supplied from the processing tank to the filter medium. The liquid feeder supplies the liquid processed by the processing tank to the liquid supplier. The recirculation unit supplies the liquid passing through the filter medium to the processing tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a vertical sectional view of the liquid-processing apparatus.    Processing tank (11)    Container (11a)    Purification tank (12)    Filter-medium container (12a)    Micro-bubble generators (13,14)    Filter media (15,16)    Liquid supplier (17)    Micro-bubbles (MB)