Proceedings

Start-up and experiences with side-stream nitrogen removal at Amsterdam Airport Schiphol WWTP: PRESENTATION ONLY

de Graaff, M.S.1, Robinson, C.1, Gerhardt-Meillink, P.1 and Meulenkamp, R.21Evides Industriewater, The Netherlands, 2Sweco, UK

(free)

Increase of the amount of wastewater produced at Amsterdam Airport Schiphol and the ambition to become more sustainable, calls for a need to adapt and extend the treatment capacity of the wastewater treatment plant at Amsterdam Airport Schiphol (Schiphol WWTP). Schiphol WWTP treats the wastewater originating from the airplanes (vacuum toilets), terminals and offices at Schiphol premises. Side-stream nitrogen removal (DEMON technology) was adopted to reduce the nitrogen load to the main activated sludge system. Furthermore, DEMON technology is an innovative and sustainable process for nitrogen removal, requiring less oxygen and produces less sludge compared to conventional nitrogen removal (nitrification/denitrification).

The presentation will show results of the startup and operations of more than a year of the DEMON process. The first few months it was not possible to achieve the expected removal efficiencies. It was found that the reject water was low in micro-nutrients cupper and zinc which limited the biological growth in the DEMON reactor. Regular addition of a small amount of digested sludge increased the levels of cupper and zinc and solved the issues of instable biomass growth. The effect of the DEMON process on the main activated sludge system will also be presented.

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