An irrecoverable-waste feeding and metering apparatus for feeding a waste separator, comprising: —a loading hopper having a mixing compartment and a discharge duct which extends between the mixing compartment and a discharge mouth thereof, for discharging material from the latter; —a central auger and two lateral augers; the central auger extending into the discharge duct and into the mixing compartment and the lateral augers are arranged inside the mixing compartment each on one side of the central auger; —a transfer device having a feed channel which has a loading portion and a feeding portion. The transfer device comprises two transfer augers extending from the loading portion along the feed channel and which each have a first helicoid.
The first helicoid of a first transfer auger has a direction opposite to that of the first helicoid of the second transfer auger.