Search results for "integrated fixed-film"

showing 4 items of 4 documents

Membrane Bioreactors for wastewater reuse: Respirometric assessment of biomass activity during a two year survey

2018

Abstract Stricter effluent limits, water shortage conditions, land availability requires today even more the needs of advanced wastewater treatments. Attractive solutions come from membrane bioreactors (MBR), Integrated Fixed Film Activated Sludge (IFAS) or combinations (i.e., IFAS-MBRs). One crucial aspect for the applicability of this overall new technology, compared to the conventional activated sludge systems, is the lack of knowledge for design and manage (e.g., kinetic constants, optimal operative conditions etc.). In view of the above frame, the aim of the present study was to assess the kinetic and stoichiometric parameters of bacterial species in MBRs by means of respirometric tech…

Kinetic and stoichiometric parameterIntegrated fixed-film activated sludge-membrane bioreactorStrategy and Management0208 environmental biotechnologyBiomass02 engineering and technology010501 environmental sciencesMembrane bioreactor01 natural sciencesIndustrial and Manufacturing EngineeringBioreactorOrganic matterEffluent0105 earth and related environmental sciencesGeneral Environmental Sciencechemistry.chemical_classificationMathematical modelling2300Settore ICAR/03 - Ingegneria Sanitaria-AmbientaleRenewable Energy Sustainability and the EnvironmentBuilding and ConstructionRespirometryPulp and paper industry020801 environmental engineeringStrategy and Management1409 Tourism Leisure and Hospitality ManagementActivated sludgechemistryWastewaterEnvironmental scienceMembrane bioreactorNitrification
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Solids and Hydraulic Retention Time Effect on N2O Emission from Moving-Bed Membrane Bioreactors

2018

Biological nutrient removal was operated at different solids (SRT) and hydraulic retention times (HRT) in order to assess their influence on nitrous oxide (N2O) emission from a hybrid moving-bed membrane bioreactor. The observed results show that the N2O production decreased when the SRT/HRT was decreased. The maximum N2O gaseous concentration was measured in the aerobic reactor at the end of phase I, and it decreased through phases II and III. From mass balances over the reactors of the system, the aerated (aerobic and membrane) reactors were the largest producers of N2O, showing that the greater part of N2O was produced during the nitrification process.

Petroleum engineeringHydraulic retention timeBiological nutrient removalSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleChemistryGeneral Chemical Engineering0208 environmental biotechnologyN2OChemistry (all)02 engineering and technologyGeneral Chemistry010501 environmental sciences01 natural sciencesIndustrial and Manufacturing Engineering020801 environmental engineeringMembraneSolids retention timeBioreactorIntegrated fixed-film activated-sludge membrane bioreactorChemical Engineering (all)Moving bedHydraulic retention time0105 earth and related environmental sciences
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Performance of a hybrid activated sludge/biofilm process for wastewater treatment in a cold climate region: Influence of operating conditions

2013

a b s t r a c t The main aim of the study was to investigate a hybrid MBBR process, mostly in terms of organic matter removal and nitrification, when operating with different values of the mixed liquor sludge retention time (SRT), and highlighting the influence of temperature on the process. Based on experience in practice it was hypothesized that nitrification could be maintained at far lower SRT's than in conventional activated sludge systems and with high organic loading rates applied. A field gathering campaign has been carried out on a hybrid activated sludge/biofilm. The obtained results highlighted that the pilot plant was capable to remove the organic matter at loading rates up to 3…

chemistry.chemical_classificationEnvironmental EngineeringIntegrated Fixed-film Activated SludgeSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleChemistryBiofilmBiomedical EngineeringEnvironmental engineeringBiological wastewater treatmentBioengineeringFraction (chemistry)Nitrificationchemistry.chemical_compoundPilot plantActivated sludgeHybrid reactorHybrid reactorMBBRNitrificationSewage treatmentOrganic matterAmmoniumBiotechnology
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ENVIRONMENTAL FOOTPRINT REDUCTION FOR WASTEWATER TREATMENT BY MULTI-OBJECTIVE OPTIMIZATION AND MODELLING

2020

The current challenge faced by researchers and managers is minimize the environmental footprint of wastewater treatment plants (WWTPs). To accomplish this goal, other than respect legal requirements, WWTPs must provide better responses regarding consumption of energy and resources, greenhouse gas (GHG) emissions, among others. The research hereby presented is based on the application of mathematical modelling with the aim to propose a framework for the minimization of WWTP’s environmental footprint towards optimization techniques. A literature review was held to gain knowledge regarding the main decision support systems (DSS) that are applied to WWTPs since they allow selecting the most app…

integrated fixed-filmSettore ICAR/03 - Ingegneria Sanitaria-Ambientalemathematical modellingconventional activated sludgemembrane bioreactoroptimization frameworkwastewater treatment plantenvironmental footprint
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