NOVELTY - Method for treating organic waste with zero discharge ACE system using microorganism formulation, involves (a) separating mixed organic waste comprising liquid and solid wastes into liquid and solid wastes, and (b) conducting fermentation treatment by adding liquid waste to use a heat generated from decomposition of organic matter included in the liquid waste in removing water from the liquid waste to control a moisture content during fermentation and decomposition of the solid waste, thus avoiding a need of discarding a discharge water.    USE - The method is useful for treating organic waste with zero discharge ACE system using microorganism formulation (claimed).    ADVANTAGE - The method provides disposed organic waste with simple operational conditions, cost-effective for disposal facility and rapid, and converts organic waste into bio-resource or energy with no need for a discharge of liquid waste generated by organic waste treatment. The apparatus solves problems, such as discharge, sea dumping, or waste land fill, and also producing solid fuel having high heating value.    DETAILED DESCRIPTION - Method for treating organic waste with zero discharge ACE system using microorganism formulation, involves (a) separating mixed organic waste comprising liquid and solid wastes into liquid and solid wastes, where the organic waste comprises food waste, livestock excretion, or sludge, and (b) conducting a fermentation treatment by adding the liquid waste to use a heat generated from decomposition of organic matter included in the liquid waste in removing water from the liquid waste to control a moisture content during fermentation and decomposition of the solid waste obtained from the solid-liquid separation step (a) using microorganisms or a microorganism formulation, thus avoiding a need of discarding a discharge water, where the organic waste when comprising livestock excretion (in slurry form) or sludge is not separated into liquid and solid wastes but mixed with the microorganism formulation to undergo fermentation and decomposition. An INDEPENDENT CLAIM is included for apparatus for treating organic waste using a microorganism formulation, which comprises storage hopper for storing organic waste, where the storage hopper comprises connection pipe provided on the one side of the bottom end thereof and connected to a liquid waste storage tank to discharge a liquid waste, and a discharge pipe provided on the bottom thereof and used for discharging a solid waste, a mixing tank for mixing the solid waste received from the storage hopper with a novel microorganism formulation or returned humus and woodchip, fermentation tank comprising cylindrical main body for receiving a mixture of the mixing tank and having a screw shaft for continuously stirring the mixture and transferring the mixture from inlet to outlet, an air feeding device for injecting air into the main unit, an air discharging device for outwardly discharging internally occurring water vapor, and a liquid waste feeding device for injecting the liquid waste into the main unit, and a drum screen separator for separating woodchip, sawdust, or humus from the mixture discharged from the fermentation tank using a rotating screen, and feeding a part of the humus back into the mixing tank.