A compacting apparatus for compressing waste material the compacting apparatus comprising: a filling opening for filling waste material into a filling chamber and a compression chamber comprising an arcuate front wall and an opposite placed rear wall and side walls, the compacting apparatus further comprising a press plunger for compressing the waste material and adapted to be moved inside the compression chamber by a power supply, said press plunger comprises a first surface and an opposite second surface and a circumferential edge delimiting the surfaces (8,9) and is pivotally arranged about an axis placed outside the compression chamber, the whole compression chamber is formed as a uniformly arcuate channel, formed by the arcuate front wall and the rear wall also being arcuate, said arcuate front and arcuate rear wall are concentric with each other and the compacting apparatus further comprises a power transmission mechanism for the press plunger comprising at least one connecting member comprising a first portion placed inside the compression chamber, and an opposite second portion placed outside the compression chamber, said press plunger is attached immovable to the first portion and that the second portion of the connecting member is placed pivotally around the axis characterized in that the power transmission mechanism further comprises means placed outside the compression chamber and comprises a bar linkage comprising a first bar and Z a second bar, and the means further comprises a third unit, the power supply being a hydraulic or pneumatic cylinder comprising a piston and a piston rod, said piston rod mounted pivotally to a first end of the first bar and to a first end of the second bar, an opposite second end (43") of the first bar mounted pivotally to a portion of the connecting member placed between the first portion and the second portion, and an opposite placed second end of the second bar mounted pivotally to the third unit. a filling opening for filling waste material into a filling chamber and a compression chamber comprising an arcuate front wall and an opposite placed rear wall and side walls, the compacting apparatus further comprising a press plunger for compressing the waste material and adapted to be moved inside the compression chamber by a power supply, said press plunger comprises a first surface and an opposite second surface and a circumferential edge delimiting the surfaces (8,9) and is pivotally arranged about an axis placed outside the compression chamber, the whole compression chamber is formed as a uniformly arcuate channel, formed by the arcuate front wall and the rear wall also being arcuate, said arcuate front and arcuate rear wall are concentric with each other and the compacting apparatus further comprises a power transmission mechanism for the press plunger comprising at least one connecting member comprising a first portion placed inside the compression chamber, and an opposite second portion placed outside the compression chamber, said press plunger is attached immovable to the first portion and that the second portion of the connecting member is placed pivotally around the axis characterized in that the power transmission mechanism further comprises means placed outside the compression chamber and comprises a bar linkage comprising a first bar and Z a second bar, and the means further comprises a third unit, the power supply being a hydraulic or pneumatic cylinder comprising a piston and a piston rod, said piston rod mounted pivotally to a first end of the first bar and to a first end of the second bar, an opposite second end (43") of the first bar mounted pivotally to a portion of the connecting member placed between the first portion and the second portion, and an opposite placed second end of the second bar mounted pivotally to the third unit.