Suchergebnisse

Economics; European Union - De serie 'Werkdocumenten' omvat stukken die in het kader van de werkzaamheden van de WRR tot stand zijn gekomen en die op aanvraag door de raad beschikbaar worden gesteld. De verantwoordelijkheid voor de inhoud en de ingenomen standpunten berust bij de auteurs.

The present paper presents a submerged anaerobic membrane bioreactor (SAnMBR) as a sustainable approach for urban wastewater treatment at 33 and 20 C, since greenhouse gas emissions are reduced and energy recovery is enhanced. Compared to other anaerobic systems, such as UASB reactors, the membrane technology allows the use of biogas-assisted mixing which enhances the methane stripping from the liquid phase bulk. The methane saturation index obtained for the whole period (1.00 ± 0.04) evidenced that the equilibrium condition was reached and the methane loss with the effluent was reduced. The methane recovery efficiency obtained at 20 C (53.6%) was slightly lower than at 33 C (57.4%) due to a reduction of the treatment efficiency, as evidenced by the lower methane production and the higher waste sludge per litre of treated wastewater. For both operational temperatures, the methane recovery efficiency was strongly affected by the high sulphate concentration in the influent wastewater. ; This research work has been supported by the Spanish Research Foundation (CICYT Projects CTM2008-06809-C02-01 and CTM2008-06809-C02-02) and the Comunidad Valenciana Regional Government (GVACOMP2009-285), which are gratefully acknowledged. ; Gimenez, J.; Martí, N.; Ferrer, J.; Seco, A. (2012). Methane recovery efficiency in a submerged anaerobic membrane bioreactor (SAnMBR) treating sulphate-rich urban wastewater: Evaluation of methane losses with the effluent. Bioresource Technology. 118:67-72. https://doi.org/10.1016/j.biortech.2012.05.019 ; S ; 67 ; 72 ; 118

[EN] The aim of this study was to assess the effect of light, oxygen and microalgae on micropollutants removal. The studied micropollutants were 4-(1,1,3,3-tetramethylbutyl)phenol (OP), technical-nonylphenol (t-NP), 4-n-nonylphenol (4-NP), Bisphenol-A (BPA). In order to study the effect of the three variables on the micropollutants removal, a factorial design was developed. The experiments were carried out in four batch reactors which treated the effluent of an anaerobic membrane bioreactor. The gas chromatography mass spectrometry was used for the measurement of the micropollutants. The results showed that light, oxygen and microalgae affected differently to the degradation ratios of each micropollutant. The results showed that under aerated conditions removal ratios higher than 91% were achieved, whereas for non-aerated conditions the removal ratios were between 50% and 80%, except for 4-NP which achieved removal ratios close to 100%. Besides, mass balance showed that the degradation processes were more important than the sorption processes. (C) 2013 Elsevier Ltd. All rights reserved. ; This research work has been supported by the Spanish Ministry of Economy and Competitiveness (MINECO, Projects CTM2011-28595-C02-01/02) jointly with the European Regional Development Fund (ERDF), The Government of the Region of Valencia (Generalitat Valenciana), within the research project "Application of Water Framework Directive 2000/60/EC on endocrine disruptors and priority substances in coastal areas in the Comunitat Valenciana" and by the Spanish Research Foundation (MINECO, project CTM2008-060809-C02-01/TECNO), within the research project "Feasibility of the SAnMBR technology to treat urban wastewater, and the technical and economic feasibility to industrial implementation" which are gratefully acknowledged. ; Abargues Llamas, MR.; Ferrer, J.; Bouzas Blanco, A.; Seco Torrecillas, A. (2013). Removal and fate of endocrine disruptors chemicals under lab-scalepostreatment stage. Removal assessment using light, oxygen and ...