Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Fixed-film"”.
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Nitrification process in integrated fixed-film activated sludge (IFFAS) system
… that may be innately present in an integrated fixed-film activated sludge (IFFAS). Due to the unique characteristics of IFFAS configuration, the biofilm component allowed for anoxic zones, as well as higher biomass retention, both factors favouring the growth of anammox bacteria. One of the …
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Utilization of fixed film media in BNR activated sludge systems
… of the four treatment trains were operated with fixed film media (Ringlace/Captor) incorporated in the aerobic zone of the system and are referred to as the Integrated Fixed Film Activated Sludge (IFAS) systems. A fourth treatment train (Control train) was operated without any fixed film media. …
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Effects of Integrated Fixed Film Activated Sludge on nitrogen removal in biological nutrient removal systems
The performance of Integrated Fixed Film Activated Sludge (IFAS) was evaluated for its effect on nitrification and denitrification in a bench scale biological nutrient removal (BNR) process configured as a Virginia Initiative Project (VIP) process. The IFAS systems consisted of a sponge - like …
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Interactions Between Heterotrophic and Autotrophic Bacteria in Fixed-Film Biological Processes Used in Drinking Water Treatment
… in the laboratory, a scaling procedure for biofilm processes was developed and evaluated. Experiments conducted with these laboratory-scale reactors simulating nitrification in water treatment showed that in addition to remove ammonia, biological treatment can be used to remove easily …
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The effect of fixed film pretreatment on activated sludge stability during the treatment of cellulose acetate wastewater
… units were set up to study the effects of a fixed film pretreatment on the stability of the AS process, using a new type of trickling filter (TF) media consisting of long plastic strips. The pretreated activated sludge (PAS) unit was compared with a control activated sludge unit (CAS). …
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Design of an integrated fixed-film activated sludge (IFAS) system for possible application at the Borcherds Quarry WWTW
… relatively large biological reactors. Integrated Fixed-Film Activated Sludge (IFAS) systems have been used extensively in European and Scandinavian countries. This process entails the addition of moving-bed biofilm carriers in certain zones of an activated sludge system to establish biofilm …
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Cod removal, nitrification and denitrification kinetics and mathematical modeling of an integrated fixed film activated sludge (IFAS) system
… removal. The purpose was to develop Integrated Fixed Film Activated Sludge Systems in which biofilm support media was installed in the activated sludge basins to enhance nitrogen removal. The objectives were to evaluate the COD removal, nitrification and denitrification kinetics, which would …
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Utilization of a combined activated sludge fixed film media system for treatment of a high strength, high ammonia, industrial wastewater
Combined activated sludge-fixed film media treatment systems are an interesting innovation in treatment technology. By adding media into the aeration basin, increased biomass concentrations may be maintained with little or no increase in solids loading to the clarifier. The ideal combined system …
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Mathematical Modeling and Evaluation of Ifas Wastewater Treatment Processes for Biological Nitrogen and Phosphorus Removal
The hybrid activated sludge-biofilm system called Integrated Fixed Film Activated Sludge (IFAS) has recently become popular for enhanced nitrification and denitrification in aerobic zones because it is an alternative to increasing the volume of treatment plant units to accomplish year round …
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Anaerobic digestion comparison of manure leachate by high-rate anaerobic reactors
… the Upflow Anaerobic Sludge Blanket (UASB), fixed film, and a hybrid for processing manure leachate as a carbon source, but also to establish design criteria for such reactors including organic loading rates (OLRs) and hydraulic loading rates (HLRs). In the first part of this research, the …
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Evaluation Of Nitrification Kinetics For A 2.0 MGD IFAS Process Demonstration
… Plant (JRTP) operated a 2 MGD Integrated Fixed Film Activated Sludge (IFAS) demonstration process from November 2007 to April 2009 to explore IFAS performance and investigate IFAS technology as an option for a full scale plant upgrade in response to stricter nutrient discharge limits in …
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X-ray diffraction studies of evaporated gold thin films deposited on aluminum nitride substrates
… average particle sizes in evaporated gold thin films on aluminum nitride substrates as a function of substrate surface condition prior to deposition. The substrate treatments evaluated were surface roughness, use of titanium and chromium inter-layers, presence of an oxide layer on the substrate …
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Utilization of Captor sponges to maintain nitrification and denitrification in BNR activated sludge at low aerobic MCRTs
… zone of the system, referred to as an Integrated Fixed Film Activated Sludge (IF AS) system, and the other as a control system, i.e., with no media in the aerobic reactors. The wastewater used for this research was pumped from a main municipal sewer of the Blacksburg-VPI Sanitation Authority …
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THE EFFECT OF BIOFILM CARRIER LENGTH ON NITRIFICATION IN MOVING BED BIOFILM REACTORS: AN EXAMINATION OF MIXING INTENSITY, SHOCK LOADINGS, AND PH CHANGES
Biofilms grown on free-floating attachment surfaces, as in integrated fixed film activated sludg (IFAS) and moving bed bioreactors (MBBRs) are commonly used in wastewater treatment, but little is known about how media geometry affects the biofilms and process performance. The objective of this …
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Evaluating the Fate of Manure Nitrogen in Confined Dairy Waste Operations: a Full-Scale Waste Analysis and Start-Up Protocol for an Anammox-Based Treatment Technology Applicable to Dairy Waste Management
… loads in stored dairy waste. A lightly loaded Fixed Film Bioreactor (FFBR), in which the OLAND process was desired to occur, was then constructed in the laboratory and monitored over 51 days. Of particular interest was the time taken to achieve stable performance of this OLAND system. …
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Distribution and Characteristics of Biomass in an Upflow Biological Aerated Filter
… first stage, ammonia oxidation second stage) fixed-film biological aerated filter (BAF) was divided in three fractions depending on their attachment strength to the media: detached, easily detachable and strongly attached. VSS measurement showed that the detached and easily detachable …
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Using Oligonucleotide Probes to Characterize Nitrification in a Two-Stage Pilot Scale Biological Aerated Filter System
… stage one, ammonia oxidation stage two) fixed film biological aerated filter (BAF) process was operated on-site at a domestic wastewater treatment plant. Over the study period, hydraulic loadings to the system were varied, generating a range of organic and ammonia loading conditions. …
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Investigating upflow biofiltration using the Biostyr process by varying the organic strength of the influent
The performance of Biostyr media using an upflow biofilter scheme was investigated. Three separate Modes that varied the organic strength of the influent at an operating temperature of 12°C were evaluated to explore how nitrification and denitrification responded to different concentrations of …
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Startup Strategies for Mainstream Anammox in Moving Bed Biofilm Reactors (MBBRs)
… PdNA without AMX inoculation in moving bed biofilm reactors (MBBRs) with two simultaneous experiments. In one experiment, an MBBR was started using IFAS carriers with a preliminary biofilm and no external carbon dosing or AMX biomass inoculation. The feed was controlled to 20°C and included …
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Enhancing hydraulic performance of a multi-stage anaerobic digester for high solids cattle manure
… (USSHR), the Leachate Feed Tank (LFT), and the Fixed Film Reactor (FFR). A fully functional Central Leachate Processing System (CLPS) was constructed to demonstrate the technology, to facilitate column scale studies, and to link with the prototype USSHR (P-USSHR) to enable the evaluation of an …
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