Modular shredding rings for implementation in waste disposers, such as food waste disposers, as well as waste disposers employing such modular shredder rings and related methods of operating and assembling, are disclosed herein. In an example embodiment, a food waste disposer includes a food conveying section, a motor section, and a grinding section that are all supported by or formed within a housing. The grinding section includes a rotating plate and a modular shredder ring, the modular shredder ring including an annular support structure and a plurality of shredder modules mounted upon or coupled to the annular support structure. Additionally, the respective shredder modules are respectively positioned along respective different portions of a radially-inwardly-facing annular surface of the annular support structure. Further, each of the respective shredder modules includes one or more respective first contacting formations that at least partly define one or more respective first spaces.

A machine to carry out the method for the reduction or removal of pathogenic agents and microorganisms contained in solids, comprising a front chamber for the entrance of the material; a contiguous rear chamber associated with the entrance chamber, by means of which the processed material is expelled; said contiguous rear chamber containing a grinding means that rotates when it is actuated by an engine; and a piston that enters into the front chamber running along said chamber into the rear chamber until it reaches a grinding means, where the grinding means consists of a solid, hard and heavy cylinder associated with a transverse axis, said cylinder being provided with a set of longitudinal slots from base to base that form edges with the cylinder surface and where the space between the cylinder surface and the rear chamber inner wall is smaller than 5 mm.

Provided are a wireless air duct device and a garbage disposer, the wireless air duct device comprises an air duct body, a top cover plate, a centrifugal turbine, a motor, a seat plate, a wireless power supply receiving module, and a wireless power supply transmitting module, the air duct body comprises an air inlet cavity, an air inlet interface, an air guide cavity, an air exhaust cavity, a coaming plate, and a side cover plate, and the coaming plate is provided at a communication point between the air exhaust cavity and the air guide cavity. The wireless power supply receiving module and the wireless power supply transmitting module are provided to be conveniently assembled and disassembled with the garbage disposer. The wireless power supply receiving module is waterproof and anti-pollution, is convenient to clean, maintains power supply performance; and fast electrical connection is achieved, and the service life is long.