NOVELTY - A method for treating a contaminated material containing an animal or vegetable waste oil and similar substance comprises growing a liquid microbial formulation containing enzymes produced by bacteria in a bio-proliferation tank to prepare a large quantity of a microbial enzyme water, adding the enzyme into a grease trap with a kitchen waste water containing an organic waste of an animal or vegetable waste oil, protein, starch etc., to effect contact and in situ decomposition of the organic materials. Such method has high efficiency to reduce environment impact.    USE - The method and apparatus are microbial treatment of contaminated material containing animal or vegetable waste oil, detergent, protein, starch and fiber e.g. in kitchen waste water from household, hotel, restaurant, bath and office.    ADVANTAGE - Such method has high efficiency to reduce environment impact.    DETAILED DESCRIPTION - A method for treating a contaminated material containing an animal or vegetable waste oil and similar substance comprises growing a liquid microbial formulation containing enzymes produced by bacteria in a bio-proliferation tank to prepare a large quantity of a microbial enzyme water, adding the enzyme into a grease trap with a kitchen waste water containing an organic waste of an animal or vegetable waste oil, protein, starch etc., to effect contact and in situ decomposition of the organic materials. An INDEPENDENT CLAIM is also included for a device for decomposing the waste water comprising a grease trap for transient retention of a kitchen waste containing an animal or vegetable waste oil, protein, starch etc. for in situ decomposition after supplying a microbial enzyme water produced in a tank for a liquid microbial formulation and a connected micro-proliferation tank to grow bacteria, with valves to regulate water supply and transfer the resulting microbial enzyme water, and sensors for checking temperature, stirrer, timer and backing pump for support and control of the various operations.    DESCRIPTION OF DRAWING(S) - Slant view of an apparatus for treating contaminated organic materials.    Liquid microbial formulation tank (10)    growing tank (15)    grease trap (30)    backing pump (34)