They are used for the dewatering and volume reduction of the wastes held by the fine screens, the auger inside the screen press drags the screen waste to the outlet.
In the meantime, the required pressure is provided by the weight and friction of the solids accumulating in the discharge pipe.
Meanwhile, the filtered water is poured into the drip pan through the drainage holes and discharged from there.
Waste can be washed for odor removal. They can be produced in stainless steel