NOVELTY - Organic sewage collection processing device has biological treatment unit (1) to treat organic sewage, collection process unit containing filter apparatus (2) in which biological treatment water is introduced, and reverse osmosis membrane separator (4) in which the filtrate water of the filter apparatus is introduced, return unit to return backwashing waste water and chemical washing waste water of the filter apparatus, and concentrated water of the separator, and flocculation process unit and solid-liquid separation unit (5) to separate water returned to the raw water introduction side.    USE - Device is used for collection processing of organic sewage (claimed).    ADVANTAGE - The organic sewage collection processing device has excellent durability and reliability. The collection processing of organic sewage is economically, stably and efficiently carried out, using the device.    DETAILED DESCRIPTION - Organic sewage collection processing device has biological treatment unit to biologically treat organic sewage, collection process unit containing filter apparatus in which a portion(s) of the biological treatment water from the biological treatment unit is introduced, and reverse osmosis membrane separator in which the filtrate water of the filter apparatus is introduced, return unit to return backwashing waste water of the filter apparatus, chemical washing waste water of the filter apparatus, and the concentrated water of the reverse osmosis membrane separator to the raw water introduction side of the biological treatment unit, and flocculation process unit and solid-liquid separation unit to separate at least one potion of water returned to the raw water introduction side of the biological treatment unit by the return unit into solid and liquid, after flocculating. The treated water of the solid-liquid separation unit is supplied by the biological treatment unit. An INDEPENDENT CLAIM is included for collection processing method of organic sewage.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the organic sewage collection processing device. (Drawing includes non-English language text)    Biological treatment unit (1)    Filter apparatus (2)    Activated charcoal stack (3)    Reverse osmosis membrane separator (4)    Flocculation process unit and solid-liquid separation unit (5)