Swedish Experience of the Deammonification Process in a Biofilm System

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Based on results from many years of pilot plant experiments a one-stage deammonification process for treatment of supernatant from dewatering of digested sludge has been applied in a full scale at the Himmerfjärden wastewater treatment plant in the Stockholm region. The plant was designed for nitrogen load of 480 kg d−1 and is based on the Moving Bed Biofilm Reactor (MBBR), with about 32% of its volume filled with suspended carriers (K1H, Kaldnes®). An outer biofilm layer performs nitritation while an inner layer the anammox reaction. Experience gained from more than 2 years of operation of the plant is presented in the paper. After an effective start—up period of about 6–7 months (totally 10 months) over 80% nitrogen removal efficiency was obtained and nitrogen removal rates reached almost 2g m−2 d at a temperature of 28 °C. The nitrite production was the limiting step for the anammox reaction. Intermittent aeration was used to secure a suitable ratio of aerobic and anaerobic conditions in the biofilm. Inhibition of the ammonia oxidizers was observed at concentrations over 15 mg l−1 of free ammonia as NH3. The free ammonia was controlled by a combination of different strategies including aeration time, influent load and effluent recirculation. Conductivity proved to be a suitable tool for the process monitoring.

Keywords: Anammox; Biofilm; DeAmmon®; Deammonification; nitrogen removal; supernatant; suspended carriers

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864711802867397

Publication date: January 1, 2011

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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