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Institute for Bioengineering and Biosciences
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Biodegradation of an Azo Dye by Aerobic Granular Sludge

Biodegradation of an Azo Dye by Aerobic Granular Sludge | iBB | Scoop.it
October 25, 2019 8:47 AM

The effective removal from textile industry wastewaters of the hazards of azo dyes and their partial degradation metabolites is severely hampered by the difficulties in cultivating microbial populations able to mineralize these recalcitrant pollutants in treatment bioreactors. In recent work applying the novel aerobic granular sludge (AGS) technology to this challenge, researchers Rita DG Franca, Nídia D Lourenço and Helena M Pinheiro (BERG-iBB) and M Conceição Oliveira (CQE) used liquid chromatography with electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) to identify the colourless metabolites produced by AGS from azo dye Acid Red 14. Metabolite profiles under different bioreaction conditions provided insights into the associated biodegradation pathways. This work was published in ACS Sustainable Chemistry & Engineering.

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Stability of Aerobic Granules During Bioreactor Operation

Stability of Aerobic Granules During Bioreactor Operation | iBB | Scoop.it
From www.sciencedirect.com - November 27, 2017 8:54 AM
Aerobic granular sludge technology is regarded as the upcoming new standard for biological treatment of wastewaters. Aerobic granules (AG) are dense, compact, self-immobilized microbial aggregates that allow better sludge-water separation and higher biomass concentrations in bioreactors than conventional activated sludge aggregates. This brings potential advantages in terms of investment cost, energy consumption and footprint. In a recent paper in Biotechnology Advances, BERG-researchers Helena Pinheiro, Nídia Lourenço and Rita Franca, and Mark van Loosdrecht from the University of Delft, provide an up-to-date review of the literature on AG stability. The identification of key factors for long-term stability of AG, the underlying mechanisms and operational conditions leading to granule disintegration are described, alongside with possible practical solutions to improve long-term stability. Click on title to learn more.
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Rita Franca to Defend PhD Thesis in Biotechnology and Biosciences

Rita Franca to Defend PhD Thesis in Biotechnology and Biosciences | iBB | Scoop.it
October 25, 2019 8:44 AM

Rita Dias Guardão Moreira da Franca will be defending her PhD thesis in Biotechnology and Biosciences on tuesday the 5th November 2019 (14 H, amphitheater PA-3, Mathematics Building). During the last years, and under the supervision of Nídia Lourenço and Helena Pinheiro from BERG-IBB and Mark van Loosdrecht from TUDelft (The Netherlands), Rita studied the application of the novel aerobic granular sludge technology to the biodegradation of recalcitrant pollutants mainly found in textile industry wastewaters. She looked into the influence of wastewater composition and reactor operational regimens on the formation and stability of aerobic granules, microbial population dynamics in them and their performance in the biodegradation of wastewater components, namely an azo dye and its recalcitrant metabolites.

The title of the thesis is “Aerobic granular sludge bioprocesses for textile wastewater treatment”.

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Stability of Aerobic Granular Sludge During Textile Wastewater Treatment

Stability of Aerobic Granular Sludge During Textile Wastewater Treatment | iBB | Scoop.it
From wst.iwaponline.com - June 5, 2017 1:19 PM

Aerobic granular sludge (AGS) is considered the next generation of wastewater treatment. However, long-term AGS stability is still a challenge. A recent study led by Nídia Lourenço from BERG-iBB assessed the effect of two feeding regimens, anaerobic plug-flow feeding and static anaerobic feeding, on the stability of AGS in sequencing batch reactors treating dye-laden synthetic textile wastewater for over 300 days. Both bioreactors could cope with dye and organic shock loads, despite the negative effect on granule integrity. Switching the wastewater substrate from hydrolyzed starch to acetate induced AGS instability, the plug-flow fed bioreactor recovering faster and revealing a higher capacity to deal with substrate-related variations. Click on title to learn more.

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