To allow an object to be processed such as garbage to be separated into a solid and a liquid to be decomposed separately, to make it possible to discharge air in a processing tank without using a deodorizing filter or an exclusive fan, and to lower the cost.

In this system for processing garbage, a disposer 2 is attached to an exhaust port of a sink, out of doors, an object to be processed that is sent from the disposer 2 is separated into a solid and a liquid by a solid-liquid separating section 6 having a draining plate 5 for separating the liquid and the solid, the liquid part of the object is gathered in a purifying tank 4 located below the draining plate 5 and is aerated by an aeration apparatus 11, the solid part is transferred by the rotation of a transferring plate 8 situated in the solid-liquid separating section 6 into a processing tank 19 where the solid part is decomposed with microorganisms and the like cultured with a carrier 18, the inside of the processing tank 19 is communicated with an aeration pump 12 to aerate the drainage in the purifying tank 4 with air in the processing tank 19.