Recovery of nutrients from cow manure and black water


The incentive for phosphorus (P) recovery is based on two arguments. Firstly, P is a finite resource and, secondly, the discharge of P-containing wastewater in densely populated areas causes severe environmental impact. Current technologies to recover P are not optimal, since the recovered P has debatable bioavailability and/or limited application. A novel approach to recover calcium phosphate (CaP) granules with low heavy metal content from black water (BW), using an Upflow Anaerobic Sludge Blanket (UASB) reactor, was published by Tervahauta et al. (2014). The similarity with phosphate rock enables the aforementioned CaP granules to be processed in the existing infrastructure from phosphate and fertilizer industry.