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Model-based operational guidelines of a bioprocess for biological nitrogen removal and complete stabilisation of anaerobically digested sewage sludge

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Abstract

The concept of one-stage reactor system for biological nitrogen removal over nitrite of ammonium high loaded sidestreams is going to be applied to remove nitrogen from anaerobically digested sewage sludge and to achieve its complete stabilisation. Dealing with sludge, the organic matter needed to denitrify is present in the inflow as particulate substrate, which requires a hydrolysis step. The latter implies high anoxic hydraulic retention time (HRT). During both aerobic and anoxic phases, ammonium is released which implies the need to enlarge aerobic HRT. Both effects lead to a total HRT higher than those for nitrification–denitrification of wastewater with soluble substrate. The purpose of this paper is to define, by computer simulation, a set of theoretical criteria, which will be applied later to the operation of a pilot-scale post-aeration reactor to be located in a Spanish WWTP. These criteria will be defined by simulating the reactor performance under different operating conditions. As a conclusion, some operation guidelines have been established for the above-mentioned scenario in terms of aerobic and anoxic retention time, dissolved oxygen concentration and effluent requirements (NH4 +, NO2 − and NO3 −).

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Authors and Affiliations

  1. Environmental Engineering Unit, CEIT and Tecnun, University of Navarra, Manuel de Lardizabal 15, 20018, San Sebastián, Spain

    M. Morras, L. Larrea & J. L. García-Heras

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  1. M. Morras
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  2. L. Larrea
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  3. J. L. García-Heras
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Correspondence to M. Morras.

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Morras, M., Larrea, L. & García-Heras, J.L. Model-based operational guidelines of a bioprocess for biological nitrogen removal and complete stabilisation of anaerobically digested sewage sludge. Bioprocess Biosyst Eng 37, 1345–1352 (2014). https://doi.org/10.1007/s00449-013-1107-z

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