Petzet, Sebastian and Peplinski, Burkhard and Cornel, Peter (2012):
On wet chemical phosphorus recovery from sewage sludge ash by acidic or alkaline leaching and an optimized combination of both.
In: Water Research, 46 (12), pp. 3769 - 3780. ISSN 0043-1354,
DOI: 10.1016/j.watres.2012.03.068,
[Article]

Petzet, Sebastian and Peplinski, Burkhard and Bodkhe, S.Y. and Cornel, Peter (2011):
Recovery of phosphorus and aluminium from sewage sludge ash by a new wet chemical elution process (SESAL-Phos-recovery process).
In: Water Science and Technology, 64 (3), pp. 693-699. IWA Publishing, [Article]