conveyor belt where all boxes are counted the load conveyor carries the medical waste into the sealed hopper 2 and liquid nitrogen crusher mill 3 which is designed to disintegrate medical waste into powder at cryogenic conditions for example hosokawa alpine countraplex 160c as herein defined disintegration refers to breaking up shredding and crushing material to a relatively uniform size that is in the range of 100 to 600 microns the liquid nitrogen crusher mill module has several features to prevent the escape of contamination from the hopper first entry is controlled by two sets of airlocks inlet and outlet i e two sets of doors the first one is open to allow medical waste going to the hopper after the first door is closed the second one is opened and permits the material to enter the crusher mill the disintegration or shredding is performed by a cryogenic grinding system based on liquid nitrogen pre crushing energy is reduced as liquid nitrogen causes the medical waste to become brittle allowing the mill to achieve high levels of grinding performance additionally the inert gas atmosphere within the mill provides a high degree of safety the mill operates over a temperature range down to.