DVO - Ammonia/Nitrogen Recovery System

When ammonia is separated it still leaves solids behind. These solids are then separated with both coarse- and fine-screen separation systems. After nutrient recovery, solids settle extremely fast, and liquids at the top of a settling tank are exceptionally clean.  Removing the solids takes out a large percentage of phosphorus and a smaller percentage of potassium fertilizer. This removal breaks the recycle buildup effect of P and K. If this removal is still not enough, then we have had success (primarily with mixed substrate digesters that take in a lot of protein type material) with using dissolved air floatation (DAF) removal that does a very good removal percentage. We have not found it necessary to utilize fresh water if we utilize some of the above steps to separate and settle/float the solids from the digested and ammonia removed liquids.