AMMONIA REMOVAL FROM SWINE WASTEWATER BY SIMULTANEOUS NITRIFICATION- DENITRIFICATION PROCESSES WITHIN A PHOTOB

TÍTULO

AMMONIA REMOVAL FROM SWINE WASTEWATER BY SIMULTANEOUS NITRIFICATION- DENITRIFICATION PROCESSES WITHIN A PHOTOBIOREACTOR 

DOCUMENTO - ARTIGO CIENTÍFICO

AUTORES - MEZZARI MELISSA; DA SILVA MARCIO; VIANCELLI ALINE; IBELLI ADRIANA M; KUNZ AIRTON; SOARES HUGO;

RESUMO/ABSTRACT

The interaction between naturally occurring anaerobic biodigestion effluent wastewater bacteria and Chlorella sp. during nitrogen removal by de-/nitrification processes within a photobioreactor was studied. qPCR assays were used to quantify the abundance of total bacteria (16S rDNA), nitrifyers (amoA) and denitrifyers (nirS). Ammonia removal coincided with the increasing growth of total bacteria (1.2×1010 copies μL -1 at 48 h) and accumulation of NO3 and NO2 intermediates. Low oxygen concentrations prevailed (< 0.2 mg/L) during dark periods and low microalgae biomass (up to 48 h) thus stimulating denitrifying bacteria growth (1.8×106 copies μL-1 at 48 h). NO3 accumulation and N2O production coincided with denitrification inhibition by the low C/N ratio. The oxidative-reductive environment encountered in a non-sterile photobioreactor can benefit swine wastewater nutrient removal by the simultaneous enhancement of de-/nitrification processes.

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