Removal of COD and nitrogen from animal food plant wastewater in an intermittently-aerated structured-bed reactor

Journal of Environmental Management
Priscila Arcoverde WosiackAna Cláudia Barana

Abstract

This study evaluated the performance of a continuous flow structured-bed reactor in the simultaneous removal of total nitrogen (TN) and chemical oxygen demand (COD) in the effluent from an animal food plant. The reactor had an intermittent aeration system; hydraulic retention time (HRT) of one day; temperature of 30 °C; and recirculation ratio of five times the flow. An experimental central composite rotational delineation (CCRD) type design was used to define the aeration conditions and nitrogen load (factors) to be studied. Response surface methodology was used to analyse the influence of the factors above the results, the removal of TN and COD. It was observed that the aeration factor showed the greatest significance for the results and that the affluent TKN concentration did not have a significant effect, at a 95% level of confidence, on COD removal. Throughout the experiment, the COD/N ratio remained between 3.2 and 3.8. The best results for COD and TN removal, 80% and 88%, respectively, were obtained with 158 min of aeration on a cycle of 180 min and 255 mg L(-1) of Total Kjeldahl Nitrogen (TKN) in the substrate.

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Citations

Nov 6, 2018·Environmental Science and Pollution Research International·Hongxiang ChaiQiang He
Aug 20, 2020·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Juliana Kawanishi BragaGiselle Patricia Sancinetti
Feb 7, 2021·Environmental Technology·Eduardo Paniguel OliveiraRafael Brito de Moura
Apr 18, 2021·Bioprocess and Biosystems Engineering·Carla Eloísa Diniz Dos SantosMárcia Helena Rissato Zamariolli Damianovic
Apr 26, 2021·Journal of Environmental Management·Cheng TangDavid Morgan

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