Bioresource Technology 255 (2018) 58–66 Contents lists available at ScienceDirect Bioresource Technology journal homepage: www.elsevier.com/locate/biortech Nitrogen removal and intentional nitrous oxide production from reject water in a coupled nitritation/nitrous denitritation system under real feed-stream conditions Max Weißbach, Paul Thiel, Jörg E. Drewes, Konrad Koch Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: A Coupled Aerobic-anoxic Nitrous Decomposition Operation (CANDO) was performed over ﬁve months to in- Nitrogen removal vestigate the performance and dynamics of nitrogen elimination and nitrous oxide production from digester Digester reject water reject water under real feed-stream conditions. A 93% conversion of ammonium to nitrite could be maintained Coupled Aerobic-anoxic Nitrous Decomposition for adapted seed sludge in the ﬁrst stage (nitritation). The second stage (nitrous denitritation), inoculated with Operation conventional activated sludge, achieved a conversion of 70% of nitrite to nitrous oxide after only 12 cycles of Nitrous oxide operation. The development of an alternative feeding strategy and the addition of a coagulant (FeCl ) facilitated Energy recovery stable operation and process intensiﬁcation. Under steady-state conditions, nitrite was reliably eliminated and diﬀerent nitrous oxide harvesting strategies were assessed. Applying
Bioresource Technology – Elsevier
Published: May 1, 2018
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