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. 2023 Aug;30(39):91060-91073.
doi: 10.1007/s11356-023-28581-y. Epub 2023 Jul 19.

Removal of organic matter and nitrogen from dairy effluents in a structured bed reactor operated with intermittent aeration

Camila Zoe Correa  1 , Isabela Bruna de Tavares Machado Bolonhesi  2 , Deize Dias Lopes  2 , Kátia Valéria Marques Cardoso Prates  3 , Luciano Aparecido Panagio  4 , Aline Ratuchne  4 , Márcia Helena Rissato Zamariolli Damianovic  5
Affiliations

Removal of organic matter and nitrogen from dairy effluents in a structured bed reactor operated with intermittent aeration

Camila Zoe Correa et al. Environ Sci Pollut Res Int. 2023 Aug.

Abstract

The objective of this research was to evaluate the performance of a structured bed reactor (SBRIA), carried out with intermittent aeration (IA), in the removal of organic matter and nitrogen from dairy effluent, when run with different organic loading rates (OLR). The SBRIA was operated for 227 days, with 2:1 AI cycles (2 h with aeration on and 1 h off) and Hydraulic Retention Time (HRT) of 16 h. Three phases, with different OLR, were evaluated: phases A (1000 gCOD m-3 day-1 - 63 days), B (1400 gCOD m-3 day-1 - 94 days), and C (1800 gCOD m-3 day-1 - 70 days). The percentage of COD, NH4+-N removal, and nitrogen removal, respectively, were above 85 ± 7%, 73 ± 27%, and 83 ± 5, in all phases. There was no accumulation of the oxidized forms of nitrogen in the reactor. The kinetic test, performed to evaluate the nitrification and denitrification in the system, indicated that even in dissolved oxygen concentrations of 4.5 mg L-1, it was possible to obtain the denitrification process in the system. The results demonstrate that the reactor under study has positive characteristics to be used as an alternative for removing the removal of organic material and nitrogen in the biological treatment of dairy effluents.

Keywords: Biofilm; Extracellular polymeric substances; Fungal strains; Kinetic analysis; Polysaccharides; Proteins; Simultaneous nitrification and denitrification (SND); Specific rate of nitrogen removal.

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