Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5308
Título: Optimization of air micro-bubble bioreactor for the winery wastewater treatment under oxygen-limited conditions
Autor: Silva, Henrique Joaquim Lopes da Silva e
Orientador: Duarte, Elizabeth Fernandes de Almeida
Oliveira, Maria Margarida da Costa Ferreira Correia de
Palavras-chave: aeration time rate
air micro-bubble bioreactor
COD removal efficiency
phenol removal efficiency
winery wastewater
Data de Defesa: 2012
Editora: ISA/UTL
Citação: Silva, H.J.L.S. - Optimization of air micro.bubble bioreactor for the winery wastewater treatment under oxygen-limited conditions. Lisboa: ISA, 2012, 47 p.
Resumo: The energy consumption of wastewater treatment processes had become an important tool parameter for designers and engineers in the wastewater treatment industry, and efforts to improve the energy efficiency of the equipments represent a great challenge. The present study proposes the use of the Air Micro-Bubble Bioreactor (AMBB), with a working volume of 14 dm3 and a hydraulic retention time of 14 days, operating in continuous mode to treat winery wastewater from second racking period, for seven different runs, during 167 days. The organic loads fluctuations, usual in the winemaking industry, and the aeration time rate (ATR), both related to energy costs, were the studied variables. The chemical oxygen demand (COD) was selected as a key parameter to monitor the AMBB performance. The total polyphenol compounds were also followed. The effect of the organic loading rate OLR was assessed by adjusting feed substrate concentration between 0.16-0.44 kg COD m-3 d-1. The ATR varied between 1, 5 and 15 min h-1. Each run was operated until steady state was reached with respect to COD concentration. All runs showed a positive answer for COD removal, having a minimum efficiency of 70%. Also the COD removal efficiency showed to be not dependent on the applied OLR and the decrease in the ATR to 5 min h-1 was accompanied by a nearly three-fold reduction in energy consumption without relevant changing on the final COD removal efficiency (93-96%). However, the total polyphenol compounds removal was highly affected by decreasing the ATR from 15 to 1 min h-1, leading to a decrease in the total polyphenols removal efficiency from 94% to 4%. In the present study, we report for the first time the impact of oxygen-limited conditions in the AMBB performance with emphasis on the efficiency energy use. The polyphenols as a performance indicator, the energy costs of treated wastewater and COD removal efficiency achieved in pilot scale show the technical feasibility of the process, giving a sustainable solution for this important sector of activity.
Descrição: Mestrado em Tecnologias do Ambiente - Tecnologias Ambientais - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/5308
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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Dissertação.pdf1,09 MBAdobe PDFVer/Abrir
Capa_lombada_CD.pdf346,6 kBAdobe PDFVer/Abrir

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