Glatt PHOS4green technology: Phosphorus recovery from sewage sludge ashes and convertion into standardized fertilizer

Glatt PHOS4green technology is a groundbreaking waste-free process that recycles the phosphorus from ash to produce ready-to-use high-quality fertilizers. In the first step of the two-stage “PHOS4green” process, a suspension is produced from the phosphate-containing ash, a mineral acid and, depending on the objective, other components. The suspension is then spray granulated in the fluidised bed. This results in fertiliser granulates that are available to plants and soil, which can be discharged, filled and delivered directly after the desired grain size has been reached.