Search results for "FAMINE CONDITIONS"

showing 2 items of 2 documents

Study of aerobic granular sludge stability in a continuous-flow membrane bioreactor.

2015

A granular continuous-flow membrane bioreactor with a novel hydrodynamic configuration was developed to evaluate the stability of aerobic granular sludge (AGS). Under continuous-flow operation (Period I), AGS rapidly lost their structural integrity resulting in loose and fluffy microbial aggregates in which filamentous bacteria were dominant. The intermittent feeding (Period II) allowed obtaining the succession of feast and famine conditions that favored the increase in AGS stability. Although no further breakage occurred, the formation of new granules was very limited, owing to the absence of the hydraulic selection pressure. These results noted the necessity to ensure, on the one hand the…

FlocculationEnvironmental EngineeringAerobic granular sludge (AGS)Segmented filamentous bacteria0208 environmental biotechnologyMicrobial ConsortiaBiomassBioengineering02 engineering and technology010501 environmental sciencesMembrane bioreactor01 natural sciencesWaste Disposal FluidBioreactorsBreakageBioreactorPressureBiomassWaste Management and Disposal0105 earth and related environmental sciencesContinuous-flow reactorSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleBacteriaSewageRenewable Energy Sustainability and the EnvironmentChemistryContinuous flowFeast/famine conditionMembraneEnvironmental engineeringWashoutFlocculationGeneral MedicineEquipment DesignPulp and paper industryAerobiosis020801 environmental engineeringHydraulic selection pressureAerobic granular sludge (AGS); Continuous-flow reactor; Feast/famine conditions; Hydraulic selection pressure; Membrane; Bioengineering; Environmental Engineering; Waste Management and DisposalBioresource technology
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Effect of the applied organic load rate on biodegradable polymer production by mixed microbial cultures in a Sequencing Batch Reactor

2006

This article studies the operation of a new process for the production of biopolymers (polyhydroxyalkanoates, PHAs) at different applied organic load rates (OLRs). The process is based on the aerobic enrichment of activated sludge to obtain mixed cultures able to store PHAs at high rates and yields. A mixture of acetic, lactic, and propionic acids at different concentrations (in the range 8.5-31.25 gCOD/L) was fed every 2 h in a sequencing batch reactor (SBR). The resulting applied OLR was in the range 8.5-31.25 gCOD/L/day. Even though, as expected, the increase in the OLR caused an increase in biomass concentration (up to about 8.7 g COD/L), it also caused a relevant decrease of maximal po…

ThaueraPolyestersSEQUENCING BATCH REACTORPROCESS CONTROLPOLYHYDROXYALKANOATESBioengineeringSequencing batch reactorMICROBIAL STORAGE POLYMERSSEQUENCING BATCH REACTOR; POLYHYDROXYALKANOATES; MICROBIAL STORAGE POLYMERS; MICROBIAL CENOSIS CHARACTERISATION; FAMINE CONDITIONS; PROCESS CONTROLApplied Microbiology and BiotechnologyWaste Disposal FluidPolyhydroxyalkanoatesWater PurificationBiopolymersBioreactorsBioreactorFood scienceBiomassFAMINE CONDITIONSComamonasbiologyBacteriaMICROBIAL CENOSIS CHARACTERISATIONbusiness.industryChemistryBiodegradationbiology.organism_classificationBiotechnologyActivated sludgeAcids AcyclicAlcaligenesbusinessBiotechnology
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