How are solids handled and sludge thickened in the wastewater process? Watch this RCAP video to find out how one wastewater plant uses a dissolved air flotation thickener to settle sludge out before the digestion process and then uses a centrifuges for de-watering. Need to simplify the process? Check out how this small wastewater plant in Ohio reduces the free water content of its sludge - all for under $300 out of pocket cost. Looking for more videos on the wastewater treatment process? RCAP offers a free 7-part video series to explain the technical steps in the process of treating wastewater.