nitrogen bio-carbon and clean water), rather than on their and carbon disposal. The operating model does not include biological recovery treatment, and can therefore be flexibly implemented in from various scales locally or as a seasonal solution. wastewater FIX-PHOS Phosphorus Prevention of Struvite Scaling in Digesters in Combination ? ? BMBF Prof. recovery with Phosphorus Removal and Recovery. The fixation of Markus from phosphorus (FIX-Phos) combines struvite prevention and Engelhart sewage phosphorus recovery by the addition of sludge with calciumsilicatehydrate (CSH) particles into the anaerobic calcium digester. The CSH fixates phosphorus as calcium silicate phosphate and reduces the phosphorus concentration in hydrate the sludge water that allows for control of struvite (CSH) formation. The phosphorus-containing recovery product can be separated and recovered from the digested sludge. In pilot plant experiments, 21% to 31% of phosphorus contained in digested sludge could be recovered when CSH was added at concentrations of 2 g/L to 3.5 g/L to a mixture of primary sludge and waste activated sludge (WAS) from enhanced biological
nitrogen and carbon recovery from wastewater bio-carbon and clean water), rather than on their disposal. The operating model does not include biological treatment, and can therefore be flexibly implemented in various scales locally or as a seasonal solution. FIX-PHOS Phosphorus recovery from sewage sludge with calcium silicate hydrate (CSH) Prevention of Struvite Scaling in Digesters in Combination with Phosphorus Removal and Recovery. The fixation of phosphorus (FIX-Phos) combines struvite prevention and phosphorus recovery by the addition of calciumsilicatehydrate (CSH) particles into the anaerobic digester. The CSH fixates phosphorus as calcium phosphate and reduces the phosphorus concentration in the sludge water that allows for control of struvite formation. The phosphorus-containing recovery product can be separated and recovered from the digested sludge. In pilot plant experiments, 21% to 31% of phosphorus contained in digested sludge could be recovered when CSH was added at concentrations of 2 g/L to 3.5 g/L to a mixture of primary sludge and waste activated sludge (WAS) from enhanced biological ? ? BMBF Prof. Markus Engelhart