Nitrifying granular systems: A suitable technology to obtain stable partial nitrification at room temperature

The operation of nitrifying biomass as biofilms or granules allows the treatment of higher ammonia loads compared to the conventional activated sludge systems, due to the large amounts of biomass accumulated inside the reactors. In the present work, a sequencing batch reactor (SBR) containing nitrif...

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Veröffentlicht in:Separation and purification technology 2010-08, Vol.74 (2), p.178-186
Hauptverfasser: Vázquez-Padín, J.R., Figueroa, M., Campos, J.L., Mosquera-Corral, A., Méndez, R.
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container_end_page 186
container_issue 2
container_start_page 178
container_title Separation and purification technology
container_volume 74
creator Vázquez-Padín, J.R.
Figueroa, M.
Campos, J.L.
Mosquera-Corral, A.
Méndez, R.
description The operation of nitrifying biomass as biofilms or granules allows the treatment of higher ammonia loads compared to the conventional activated sludge systems, due to the large amounts of biomass accumulated inside the reactors. In the present work, a sequencing batch reactor (SBR) containing nitrifying granules with an average diameter of 1.9–2.9 mm was operated for 880 d at room temperature (18–24 °C). The obtained granules presented high settling velocities around 100 m h −1 and low sludge volumetric indexes of 30 mL (g VSS) −1 which indicated their good settling properties. When nitrogen loading rate (NLR) of 0.4 g NH 4 +-N L −1 d −1 was fed, complete nitrification to nitrate was reached. The increase of the NLR to 0.8 g NH 4 +-N L −1 d −1 caused a stable accumulation of nitrite with only 20% of nitrate production even by keeping the dissolved oxygen (DO) concentration in the bulk liquid at 8 mg O 2 L −1. Batch assays performed in a range from 2 to 30 mg O 2 L −1 of DO showed that partial nitrification was reached by fixing the DO concentration in the range from 2.0 to 3.5 mg O 2 L −1 in the bulk liquid. The total surface of the granules to bulk liquid ratio was low and ranged from 58 to 216 m 2 m −3 being the oxygen mass transfer through the interface bulk liquid–granule surface the limiting step. This oxygen transfer limitation allowed reaching stable partial nitrification at room temperature. For more than one year, an effluent with a mean NO 2 −/NH 4 + molar ratio close to 1.0, suitable to feed a subsequent Anammox reactor, was obtained. A maximal nitrite production of 1 g NO 2 −-N L −1 d −1 was reached without nitrite oxidation to nitrate. The bacteria populations in the granules belonged mainly to the genus Nitrosomonas and were placed in the external layer of the granules of 100 μm.
doi_str_mv 10.1016/j.seppur.2010.06.003
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subjects Activated sludge
Aerobic granules
Nitrogen
Nitrosomonas
Partial nitrification
SBR
Temperature
title Nitrifying granular systems: A suitable technology to obtain stable partial nitrification at room temperature
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