Biosolids Dryers

Dewatered biosolids are introduced through a wet material feed hopper 1 (not shown) and mixed with dry biosolids in batch mixers 2. A proper ratio of thoroughly mixed materials entering the dryer 3 ensures the consistency required to efficiently reduce moisture and to optimize the formation of Class “A” PFRP dry prill. Mixed material is conveyed through the dryer where the heat removes excess moisture and reduces pathogens. Proprietary biosolids dryer technology ensures a uniform and consistent ≥90% dry solids end product. Processed material leaves the dryer through a knock out box 4 and is carried to a screen shaker 5 where it is processed to a uniform size. Any material that is too small is sent back to the dry material hopper 6. Material that is too large is processed through a crusher 7 and used as starter feed for new feed stock. The size accepted biosolid fertilizer prills are conveyed through a cooling screw 8 and emptied in a client supplied storage container. Particulate and dust from the vapor stream is collected and removed by twin cyclones 9. The captured particulates from the twin cyclones are transferred via a drag conveyor 10 back to the dry material feed hopper 6. The vapor stream from the twin cyclones goes through a venturi scrubber 11 and inertial separator 12 to remove any residual particulate from the vent stream.