Abstract: A compost bin for decomposing compostable matter such as food and human waste, comprising a plurality of vertical bin walls which surround a base and define a bin interior which contains the compostable matter. In a preferred embodiment, four vertical bin walls are contemplated, forming a rectangle. A plurality of apertures are formed into the vertical bin walls, and a plurality of hollow ventilation tubes having perforations disposed about the periphery extend through the apertures. A cross-tube connects the hollow ventilation tubes and has a down-turned segment which extends perpendicular to the ground and terminates at an open cross-tube end. A bio-filter bag comprising a porous material and filled with organic material is secured to the open cross-tube end of the cross tube, such that any gases which manage to escape the bin interior through the perforations into the hollow ventilation tubes and down-turned segment of the cross-tube will be effectively filtered.