Phosphorus recovery from sewage sludge
Phosphorus is a valuable nutrient that every organism needs but cannot produce for themselves. Fossil phosphorus resources are limited, nevertheless, we are quite profligate with this precious raw material.
For this reason, Dr. Christian Adam and his team from the
Thermochemical Residues Treatment and Resource Recovery Division are working on developing technical solutions for recovering and recycling phosphorus back into the material cycle.
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Phosphorus recovery from sewage sludge - Next generation fertilizers
Raw material for phosphorus recycling: sewage sludge ash
Additives for thermochemical treatment of sewage sludge ash...
…to produce a fertiliser source material in a rotary kiln at 1000° Celsius. The aim is to separate pollutants and convert poorly soluble phosphate into a plant-available form.
Other nutrients can be added – depending on demand.
The last step: granulates are produced from the phosphorus-containing material.
The granulates can be used as a fertiliser in the future.