A compacting apparatus of waste objects of at least a first and a second type comprising: - a seat that is defined by end walls (13', 16') for containing a waste object to be compacted, the seat having an entrance for introducing a waste object (11, 100) to be compacted; - a support assembly (18, 19) of the seat arranged to support the waste object to be compacted (11, 100) in the seat; - a push member arranged inside the seat; - means for moving the push member inside the seat and with respect to the end wall (13',16') to compact the waste object against at least one end wall (13',16') of the seat; - wherein the support assembly (18,19) is configured to be moved from a support position, in which the support assembly supports the waste object, to a discharge position in which the support assembly discharges a compacted object of the first type or a compacted object of the second type, through an aperture of the seat, said aperture formed between edges (18',19') of the support assembly (18,19) during the movement from the support position to the discharge position; - a first means for collecting compacted objects of the first type; - a second means for collecting compacted objects of the second type; characterized in that it further comprises: - a means (18, 19, 100, 103) for impeding arranged to impede the discharge of compacted object of a third type through the aperture, the means for impeding (18, 19, 100, 103) arranged to impede the movement of the support assembly (18,19) from the support position to the discharge position such that no aperture is formed between said edges (18',19'), which remain closed after compacting of the object of third type in that the means (18, 19, 100, 103) for impeding comprise support members (18,19) of the support assembly, an actuator for moving the support members (18,19) and a control system for the actuator and in that the control system is configured, to activate, in a first functioning cycle, the actuator to cause the movement of the support assembly (18,19) from the support position to the discharge position, and not to activate, in a second functioning cycle, the actuator to impede the movement of the support assembly (18,19) from the support position to the discharge position. - a seat that is defined by end walls (13', 16') for containing a waste object to be compacted, the seat having an entrance for introducing a waste object (11, 100) to be compacted; - a support assembly (18, 19) of the seat arranged to support the waste object to be compacted (11, 100) in the seat; - a push member arranged inside the seat; - means for moving the push member inside the seat and with respect to the end wall (13',16') to compact the waste object against at least one end wall (13',16') of the seat; - wherein the support assembly (18,19) is configured to be moved from a support position, in which the support assembly supports the waste object, to a discharge position in which the support assembly discharges a compacted object of the first type or a compacted object of the second type, through an aperture of the seat, said aperture formed between edges (18',19') of the support assembly (18,19) during the movement from the support position to the discharge position; - a first means for collecting compacted objects of the first type; - a second means for collecting compacted objects of the second type; - a means (18, 19, 100, 103) for impeding arranged to impede the discharge of compacted object of a third type through the aperture, the means for impeding (18, 19, 100, 103) arranged to impede the movement of the support assembly (18,19) from the support position to the discharge position such that no aperture is formed between said edges (18',19'), which remain closed after compacting of the object of third type in that the means (18, 19, 100, 103) for impeding comprise support members (18,19) of the support assembly, an actuator for moving the support members (18,19) and a control system for the actuator and in that the control system is configured, to activate, in a first functioning cycle, the actuator to cause the movement of the support assembly (18,19) from the support position to the discharge position, and not to activate, in a second functioning cycle, the actuator to impede the movement of the support assembly (18,19) from the support position to the discharge position.