New Processes for the Improvement of Sludge Digestion and Sludge Dewatering

Kopp, J.1 and Ewert, W.2
1Lengede, 2PCS Hamburg


The examination of numerous sewage sludges from municipal wastewater treatment plants leads to the conclusion that on
the one hand dewaterability of these sludges worsens and that on the other hand dewaterability of sludges becomes more
and more important due to increasing disposal costs. Especially wastewater treatment plants with inflows from the food
processing industry often face sludges with problematic dewatering characteristics.
A new treatment procedure, the CAMBI Thermal Hydrolysis Process (THP), will be discussed which can significantly improve
the dewatering behaviour of sewage sludges and the gas-production in anaerobic digestion. In the CAMBI Process, sludges
are treated thermally, which includes the proteins contained in the sludge. Exemplary results of full-scale tests will be
presented in this paper.

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