Sludge minimization

The missing link in total sludge minimisation could be realised by the application of PYREG® pyrolysis technology in which dewatered and (pre) dried sludges or screenings are pyrolysised and reduced to a valuable biosolid. At present this biosolid end product is used as an effective soil conditioner.

This innovative technology has been developed and produced by the company PYREG GmbH, who are providing this break-through technology for decentralised sludge processing. Medium sized WWTP and sludge processing plants (10.000 – 200.000 p.e.) are the optimum application. This thermal reduction of sludge and/or screenings generates significant economic benefits by reducing one of the largest cost activities of the entire sewage and sludge treatment utilities.

The technology

PYREG® provides pyrolysis of biomass. The fuel (biomass, sludge, screenings) is fed into a heating zone in which temperatures of max. 800°C. are reached. The biomass or sludge isn’t burned but pyrolysised. During the heating process, so called syngas is formed which is sequenced burned in a combustion chamber equipped with an efficient FLOX® burner (1250°C). The heat which is generated during the combustion of the gases is used to provide the necessary heat for the pyrolysis process.

PYREG® is characterised by significant low exhaust emission values. Furthermore, by using an exhaust gas heat exchange system more heat could be reclaimed from exhaust gases. This medium grade heat (up to 90°C) could be provided to facilitate the heat balance for a sludge drying process.

Applying PYREG® in a total sludge management concept with TPH, digestion, dewatering and sludge-drying and energy generation, is likely to significantly reduce sludge disposal costs and minimise total operational costs.