Energy autarky of sewage treatment plants, while reaching chemical oxygen demand (COD) and N discharge limits, can be achieved by means of shortcut N-removal. This study presents the results of a shortcut N-removal pilot, located at the biological two-‘stage (high/low rate) wastewater treatment plant of Breda, The Netherlands. The pilot treated real effluent of a high-rate activated sludge (COD/N = 3), fed in a continuous mode at realistic loading rates (90–100 g N/(m3·d)). The operational strategy, which included increased stress on the sludge settling velocity, showed development of a semi-granular sludge, with average particle size of 280 μm (ø4,3), resulting in increased suppression of nitrite-oxidizing bacteria. The process was able to remove part of the nitrogen (51 ± 23%) over nitrite, with COD/N removal ratios of 3.2 ± 0.9. The latter are lower than the current operation of the full-scale B-stage in Breda (6.8–9.4), showing promising results for carbon-efficient N-removal, while producing a well settling sludge (SVI30 < 100 mL/g).
Energy efficient treatment of A-stage effluent: pilot-scale experiences with shortcut nitrogen removal
D. Seuntjens, B. L. M. Bundervoet, H. Mollen, C. De Mulder, E. Wypkema, A. Verliefde, I. Nopens, J. G. M. Colsen, S. E. Vlaeminck; Energy efficient treatment of A-stage effluent: pilot-scale experiences with shortcut nitrogen removal. Water Sci Technol 5 May 2016; 73 (9): 2150–2158. doi: https://doi.org/10.2166/wst.2016.005
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