Safe use of PPB biomass as fertilizer
In DEEP PURPLE wastewater is transformed into valuable raw material for the production of biofertilizers with the help of Purple Phototrophic Bacteria (PPB). Groupe Roullier investigates the efficiency and safety of PPB biomass as raw material for formulation of biofertilizers in pellets. The MSDS (Material Safety Data Sheet) has been created and heavy metal analysis has confirmed its non-toxicity in the biofertilizer. So it’s proven that the PPB biomass is not toxic for biofertilizers production.
PPB biomass comes from urban biowaste, i.e., domestic wastewater treatment and complies with limit values in sludge for use in agriculture (Directive 86/278/86).
The PPB biomass shows high ratio NPK ranging from 100:25:27 to 100: 93:18 and is obtained by a low-energy intensive process by avoiding the use of oxygen (compared to that of conventional wastewater treatment). Pellets from PPB biomass have been produced for five field trials running in Italy, France and Spain with spring wheat and maize.