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Conventional Anaerobic Reactors Applied to Denitrification: a Comparison Between Packed Bed and UASB Reactors Under Low COD Conditions

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Abstract

Anaerobic reactors have been spreading in places with tropical climate and in developing countries. Their association with aerobic reactors provides great removal of carbonaceous matter with lower energy consumption and sludge production, although it does not allow the reduction in the concentration of total nitrogen. An alternative that could provide nitrogen removal without the construction of new reactors would be the nitrified effluent recirculation to the anaerobic reactor, in which denitrification would take place. Therefore, in this study, we sought to perform the nitrified effluent recirculation to the packed bed reactor (PBR) and UASB and concluded the following: (a) due to the presence of filling material, PBR tended to present a better performance in denitrification and removal of organic matter and suspended solids than the UASB reactor; (b) when performing the nitrified effluent recirculation to anaerobic reactors, the COD/NO3−-N ratio must not be less than 6; (c) the concentration of N2O in the biogas of both reactors remained below the detection limit, minimizing the production of greenhouse gases; and (d) the limitation of organic matter promoted partial denitrification, creating conditions for the emergence of anammox bacteria in the sludge.

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Acknowledgements

The authors would also like to acknowledge the service of the Espaço da Escrita – Pró-Reitoria de Pesquisa – UNICAMP for helping translate the original manuscript.

Funding

The authors would like to thank CNPq (National Council for Scientific and Technological Development, process number 311275/2015-0) and FAPESP (São Paulo Research Foundation, process number 2017/07490-4) for financing this study.

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  1. School of Civil Engineering, Architecture and Urban Planning, FEC, UNICAMP (University of Campinas), Avenida Albert Einstein, 951, Cidade Universitária “Zeferino Vaz”, P.O. Box 6021, Campinas, SP, 13083-852, Brazil

    Natalia Cangussu Duarte, Ariane Corrêa Barbosa, Taína Martins Magalhães, Cassiana Carolina Montagner, Luana Mattos de Oliveira Cruz & Adriano Luiz Tonetti

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  1. Natalia Cangussu Duarte
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Correspondence to Adriano Luiz Tonetti.

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Duarte, N.C., Barbosa, A.C., Magalhães, T.M. et al. Conventional Anaerobic Reactors Applied to Denitrification: a Comparison Between Packed Bed and UASB Reactors Under Low COD Conditions. Water Air Soil Pollut 232, 54 (2021). https://doi.org/10.1007/s11270-021-05009-2

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