A waste managing assembly for the collection, temporary storage and discharge of waste, the waste managing assembly comprising a waste tank (2,4), said waste tank (2,4) including: - a bottom waste storage and discharge tank section with a base for supporting the assembly; - at least one relocatable top waste receiving tank section having at least one waste introduction opening for introducing waste into said top waste receiving tank section; - an interface for docking a lower part of each top waste receiving tank section on an open upper part of the bottom waste storage and discharge tank section; and - bottom walls (11A, 11B) supported at the lower part of each top waste receiving tank section and operable to selectively open and close communication of waste between said top and bottom tank sections of the waste managing assembly; said bottom walls are provided with guide members (20A, 20B) that extending externally of the associated end wall, cooperate with a first pair of guide formations (8A, 8B) of a docking adapter included in the interface to control operation of the bottom walls between a closed position blocking an otherwise open waste communication between the lower part of a top waste receiving tank section and the bottom waste storage and discharge tank section and an open emptying position opening said communication between a top waste receiving tank section and the bottom waste storage and discharge tank section, characterized in that the waste managing assembly is for the collection, temporary storage and discharge of waste in association with a pneumatic material collection and transport system, wherein the pneumatic material collection and transport system using air flow through a waste transport pipe to transport collected material from the waste tank (2, 4) at one or more waste deposit and discharge points of the pneumatic material collection and transport system, wherein the base supports the assembly at a waste deposit and discharge point; and in that arcuate guide grooves (12, 13) are formed in associated end walls (4A, 4B) of each top waste receiving tank section, in that the bottom walls (11A, 11B) at the lower part of each top waste receiving tank section are swingably and slidably supported in the guide grooves in the opposite end walls (4A, 4B) of each top waste receiving tank section and in that the guide members (20A, 20B) cooperate with said guide grooves (12, 13), as well, for said control of said operation of the bottom walls. - a bottom waste storage and discharge tank section with a base for supporting the assembly; - at least one relocatable top waste receiving tank section having at least one waste introduction opening for introducing waste into said top waste receiving tank section; - an interface for docking a lower part of each top waste receiving tank section on an open upper part of the bottom waste storage and discharge tank section; and - bottom walls (11A, 11B) supported at the lower part of each top waste receiving tank section and operable to selectively open and close communication of waste between said top and bottom tank sections of the waste managing assembly; the waste managing assembly is for the collection, temporary storage and discharge of waste in association with a pneumatic material collection and transport system, wherein the pneumatic material collection and transport system using air flow through a waste transport pipe to transport collected material from the waste tank (2, 4) at one or more waste deposit and discharge points of the pneumatic material collection and transport system, wherein the base supports the assembly at a waste deposit and discharge point; and in that arcuate guide grooves (12, 13) are formed in associated end walls (4A, 4B) of each top waste receiving tank section, in that the bottom walls (11A, 11B) at the lower part of each top waste receiving tank section are swingably and slidably supported in the guide grooves in the opposite end walls (4A, 4B) of each top waste receiving tank section and in that the guide members (20A, 20B) cooperate with said guide grooves (12, 13), as well, for said control of said operation of the bottom walls.