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The PYREG® process uses the principle of the staged combustion. For that purpose, the dried sewage sludge is guided through PYREG® reactors operated at a temperature of 550 to 600°C. In the PYREG® reactors the sludge is not burned, but carefully degassed and then carbonized, by admission of a tightly targeted air stream. This way the material is completely sanitized.

HIGH PLANT AVAILABILITY OF PHOSPHORUS

Due to the selected temperature level in the PYREG® reactors the phosphorus in the final product grants a high plant availability, in contrast to ashes resulting from conventional mono-incineration systems, burning the sludge at temperatures above 700°C. Supplementary costly pulping of the phosphorus is not necessary – the product is directly marketed in the fertilizer industries.

 

NO PROBLEMATIC SUBSTANCES

As the combustible gas generated in the PYREG® reactors is completely burned by the FLOX® method (flame-less oxidation) at a temperature of 1.250°C inside a separate combustion chamber, thermal NOX is significantly avoided. The formation of problematic substances like condensate or tar is suppressed as well, because the carbonization gas is not cooled, but oxidized in the combustion chamber. Inside a flue gas cleaning system, harmful acid gas is absorbed by means of alkaline flue gas scrubbers, whereas volatile components like mercury are retained by charcoal filters.

SELFSUSTAINING PROCESS

The mineralization process is selfsustaining; after completion of the activation phase no further external energy is required to run the process, as the energy of the sludge is sufficient for the continuance of the thermal treatment. It is even possible to benefit from the excess heat produced; an amount of 150 kWth may be used for sludge drying.