Sludge digester liquors can be responsible for up to one third of the nitrogen load to the biological step of wastewater treatment plants (WWTPs). The conventional process for ammonia removal via two sequential processes, i.e. nitrification and denitrification, is increasingly being challenged by a one-step process in which ammonium is oxidized directly to nitrogen gas e.g. ammonium oxidation (anammox) process. In this novel process, compared to a conventional nitrification and denitrification, the aeration and carbon-source demand is reduced by over 50 and 100%, respectively. This study focuses on the feasibility of nitrogen removal from sludge digester liquors from WWTPs in the combined nitritation/anammox process. The specific aim of this study was to determine the impact of continuous and intermittent aeration, as well as concentration of dissolved oxygen on the rate of ammonia removal in the combined nitritation/anammox process. Nitritation and anaerobic ammonium oxidation was carried out simultaneously in a sequencing batch reactor (SBR, V=10 dm3) with the nitrogen removal rate of 0,852 kg N m−3reactor d−1 and nitrogen removal efficiency of approximately 75%.
Authors
Additional information
- Category
- Aktywność konferencyjna
- Type
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Language
- angielski
- Publication year
- 2014
