A system for comminuting solid waste material in a flow of liquid through a civic work for waste disposal, the system arranged to be insertable into the civic work such that the liquid flows through the system, and comprising: - a shredder module comprising a shredding device, an upper shredding device housing, and a lower shredding device housing, wherein the shredding device comprises parallel first and second shredding stacks that include first and second parallel shafts rotatably mounted between the upper shredding device housing and the lower shredding device housing, each of the first and second parallel shafts including a plurality of cutting elements mounted on said first shaft in interspaced relationship with a plurality of second cutting elements mounted on said second shaft, each of said cutting elements having at least one cutting tooth thereon, said cutting elements being positioned between and separated in an axial direction by spacers which are coplanar with the cutting elements of the adjacent stack such that a cutting element from one stack and a spacer from the other stack form a pair of interactive shredding members; - a screen drum module comprising a screening drum, an upper screening drum housing, and a lower screening drum housing, wherein the screening drum is rotatably mounted between the upper screening drum housing and the lower screening drum housing, wherein the screening drum is configured to permit the fluid flow to pass therethrough while capturing solids on an outer surface for delivery to the shredding device; - an interconnecting frame that connects the shredder module and the screen drum module; Characterized in that - the screen drum module is connected anteriorly to the interconnecting frame and the shredder module is connected posteriorly to the interconnecting frame relative to the liquid flow. - a shredder module comprising a shredding device, an upper shredding device housing, and a lower shredding device housing, wherein the shredding device comprises parallel first and second shredding stacks that include first and second parallel shafts rotatably mounted between the upper shredding device housing and the lower shredding device housing, each of the first and second parallel shafts including a plurality of cutting elements mounted on said first shaft in interspaced relationship with a plurality of second cutting elements mounted on said second shaft, each of said cutting elements having at least one cutting tooth thereon, said cutting elements being positioned between and separated in an axial direction by spacers which are coplanar with the cutting elements of the adjacent stack such that a cutting element from one stack and a spacer from the other stack form a pair of interactive shredding members; - a screen drum module comprising a screening drum, an upper screening drum housing, and a lower screening drum housing, wherein the screening drum is rotatably mounted between the upper screening drum housing and the lower screening drum housing, wherein the screening drum is configured to permit the fluid flow to pass therethrough while capturing solids on an outer surface for delivery to the shredding device; - an interconnecting frame that connects the shredder module and the screen drum module; - the screen drum module is connected anteriorly to the interconnecting frame and the shredder module is connected posteriorly to the interconnecting frame relative to the liquid flow.