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Winery wastewater characterisation, monitoring and treatment evaluation using an air micro-bubble bioreactor
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Resumo(s)
Aerobic treatment systems are commonly employed in winery wastewater treatment, because of their high efficacy, ease of use and versatility. However, a number of these systems are high energy intensive, have high establishment costs, generate large volumes of sludge, and are not yet optimised. This thesis addresses the design and optimisation of a vertical air micro-bubble bioreactor (AMBB), at pilot scale, for the treatment of winery wastewater. Critical operating parameters were adjusted to allow water reuse, the decrease in sludge production and energy requirements, as well as the recovery of winery by-products. To evaluate the AMBB efficiency, several operational parameters were studied (feeding regime, aeration time rate and organic loading rate), based on different response variables, such as chemical oxygen demand (COD), polyphenolic compounds and biomass production. In batch experiments, the COD removal was 98-99%, after 15 days of treatment, while under continuous conditions the AMBB yielded a COD removal of 93-96% for an aeration time rate (ATR) of 20 min h-1 and different organic loading rates applied. For wastewater generated during the second racking period, a shorter ATR (5 min h-1) did not significantly affect the COD removal, thus reducing both energy demand and operating costs. Although removal of polyphenols was less effective, these compounds were effectively recovered by ultrafiltration and sedimentation operations. The biodegradability of wastewater produced during each phase of the winemaking process, including poorly studied streams (electrodialysis wastewater), was evaluated by physicochemical characteristics, respirometric methods and kinetic parameters to predict their behaviour when discharged into the treatment system. Overall, the results showed that the AMBB is an economically feasible alternative to conventional treatments.
Descrição
Doutoramento em Engenharia do Ambiente - Instituto Superior de Agronomia
Palavras-chave
air micro-bubble bioreactor chemical oxygen demand polyphenol compounds treatment efficiency winery wastewater
Contexto Educativo
Citação
Oliveira, M.M.C.F.C. - Winery wastewater characterisation, monitoring and treatment evaluation using an air micro-bubble bioreactor. Lisboa: ISA, 2013, 235 p.