Influence of recirculation rate on the performance of a combined anaerobic-aerobic reactor applied to the removal of carbon and nitrogen from poultry slaughterhouse wastewater

The objective of this study was to evaluate a combined anaerobic-aerobic upflow fixed-bed reactor with liquid phase recirculation for the removal of nitrogen and organic matter from poultry slaughterhouse wastewater. The reactor performance was evaluated with a hydraulic retention time (HRT) of 11 h...

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Bibliographic Details
Published in:African journal of biotechnology 2016-09, Vol.15 (37), p.2053-2062
Main Authors: Carla, L. Lopes, Adriana, N. de Lima Model, Jackeline, T. Gotardo, Fernando, H. Passig, Eloy, L. de Mello, Benedito, M. Gomes, Simone, D. Gomes
Format: Article
Language:English
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Summary:The objective of this study was to evaluate a combined anaerobic-aerobic upflow fixed-bed reactor with liquid phase recirculation for the removal of nitrogen and organic matter from poultry slaughterhouse wastewater. The reactor performance was evaluated with a hydraulic retention time (HRT) of 11 h and three different recirculation rates (R=0.5; 1 and 2). The highest nitrogen removal efficiency value was obtained with an HRT of 11 h (6.8 h in the anaerobic zone and 4.2 h in the aerobic zone) and a recirculation rate of 2. In this condition, the total nitrogen removal efficiency was 69%, with effluent concentrations of 6 mg NH sub(4) super(+) L super(-1) and 12 mg NO sub(3) super(-) L super(-1). For all tested conditions, there was good chemical oxygen demand (COD) removal, with efficiency above 95%. The effect of dilution and the favoring of mass transfer caused by the increase in the recirculation rate positively influenced reactor performance.
ISSN:1684-5315
1684-5315
DOI:10.5897/AJB2016.15578