biofilm reactor Articles

  • Mathematical modelling of biofilms and biofilm reactors for engineering design

    Mathematical models are critical to modern environmental biotechnology—both in research and in the engineering practice. Wastewater treatment plant (WWTP) simulators are used by consulting engineers and WWTP operators when planning, designing, optimizing, and evaluating the unit processes that comprise municipal and industrial WWTPs. Many WWTP simulators have been expanded to include a submerged ...


    By IWA Publishing

  • The expanded Bed Biofilm reactor (EBBR) – an innovative Biofilm approach for tertiary nitrification

    ABSTRACT The expanded bed biofilm reactor (EBBR) was developed by Advanced Bioprocess Development Ltd. (ABD) to provide a compact tertiary nitrification process. In terms of performance, the EBBR can meet an NH3-N discharge of less than 1 mg/L at high volumetric loading rates (1.0 kg NH3-N/m3 expanded bed /day). This high rate results from a predominance of nitrifying bacteria immobilized as ...

  • From biofilm ecology to reactors: a focused review

    Biofilms are complex biostructures that appear on all surfaces that are regularly in contact with water. They are structurally complex, dynamic systems with attributes of primordial multicellular organisms and multifaceted ecosystems. The presence of biofilms may have a negative impact on the performance of various systems, but they can also be used beneficially for the treatment of water ...


    By IWA Publishing

  • Development of a simplified model for the fixed biofilm reactor

    A simplified fixed biofilm model was developed to formulate the relationship between the substrate concentrations at both the entry and exit, at the biofilm–liquid interface and at the biofilm attached surface along with average substrate flux in the biofilm, substrate flux at the biofilm–liquid interface and effective biofilm thickness. The model considered the substrate mass transport ...


    By IWA Publishing

  • Modeling phototrophic biofilms in a plug-flow reactor

    The use of phototrophic biofilms in wastewater treatment has been recognized as a potential option for development of new reactor configurations. For better understanding of these systems, a numerical model was developed including relevant microbial processes. As a novelty, this model was implemented in COMSOL Multiphysics, a modern computational environment for complex dynamic models. A ...


    By IWA Publishing

  • Modelling ammonium-oxidizing population shifts in a biofilm reactor

    The dynamic reactor behaviour of a nitrifying inverse turbulent bed reactor, operated at varying loading rate, was described with a one-dimensional two-step nitrification biofilm model. In contrast with conventional biofilm models, this model includes the competition between two genetically different populations of ammonia-oxidizing bacteria (AOB), besides nitrite-oxidizing bacteria (NOB). ...


    By IWA Publishing

  • The application of moving bed biofilm reactor to denitrification process after trickling filters

    The paper presents research of a prototype moving bed biofilm reactor (MBBR). The device was used for the post-denitrification process and was installed at the end of a technological system consisting of a septic tank and two trickling filters. The concentrations of suspended biomass and biomass attached on the EvU Perl moving bed surface were determined. The impact of the external organic ...


    By IWA Publishing

  • Modelling of moving bed biofilm membrane reactors (MBBMR) for on-site greywater treatment

    The study evaluates with a mechanistic model the pilot plant results of a combined moving bed biofilm process and membrane filtration (MBBMR) treating single household greywater. It mainly includes the simulation of reactor hydraulics, degradation of pollutants, development of biomass and settlement of sludge. Iterative calibration was made with steady-state results of a 10-month pilot test. The ...


    By IWA Publishing

  • Analysis of Sulfide Inhibition in Anaerobic Biofilm Reactors Fed a Sulfate-Rich Wastewater

    IntroductionMany industries produce wastewaters high in organic and sulfate content. Anaerobic biological treatment of these wastewaters can result in the formation of methane by methanogenic archaea (MA) and sulfide as sulfate reducing bacteria (SRB) reduce the sulfate to sulfide. Unfortunately, sulfide can inhibit the activity of both SRB and MA. Previous research has shown that biofilm ...

  • Effects of Fe(III) on biofilm and its extracellular polymeric substances (EPS) in fixed bed biofilm reactors

    The effects of Fe(III) on the biofilm mass and activity, the biofilm micromorphology as well as the composition and functional groups characteristics of extracellular polymeric substances (EPS) in biofilm were investigated in laboratory-scale fixed bed biofilm reactors. The results showed that 2 mg/L of Fe(III) promoted the biofilm mass and improved the biofilm activity, but 16 mg/L of Fe(III) ...


    By IWA Publishing

  • Design of multistage activated sludge-biofilm reactors: a rational approach

    This paper outlines a mathematical model developed for steady-state multistage completely mixed hybrid reactors, starting from basic mass balance expressions for the system and Fick's theory for diffusion of substrate into the biofilm. The model being complex, a design procedure has been proposed that uses predefined effluent quality profile across the system and results in an accurate and ...


    By Inderscience Publishers

  • Is Your Moving Bed Biofilm Reactor (Mbbr) Running On All Cylinders?

    Evaluation of a full-scale MBBR process for nitrification is reported. Performance of the MBBR was found to be highly dependent on the hydraulic characteristics of the basin which could be optimized with improved influent flow distribution at the basin inlet. Installing a baffle on the influent pipe or introducing influent at multiple points located laterally across the entire influent end of the ...


  • Performance of a fixed-bed biofilm reactor with microbubble aeration in aerobic wastewater treatment

    Microbubble aeration is supposed to be highly efficient for oxygen supply in aerobic wastewater treatment. In the present study, the performance of a fixed-bed biofilm reactor microbubble-aerated using a Shirasu porous glass (SPG) membrane system was investigated when treating synthetic municipal wastewater. The biofilm formation on the carriers was enhanced with microbubble aeration due to ...


    By IWA Publishing

  • Degradation of organic matter from domestic wastewater with loofah sponge biofilm reactor

    A laboratory-scale oxic biofilm reactor using loofah sponge as support material was carried out to study its start-up characteristics and the optimum operation parameters in removing organic matter and nitrogen from domestic wastewater. It took no more than 10 days to complete microbiological cultivation and acclimation, indicating that the natural loofah sponge was a superior support material ...


    By IWA Publishing

  • Performance of an ultra-compact biofilm reactor treating domestic and synthetic wastewaters

    The performance of an ultra-compact biofilm reactor (UCBR) treating domestic wastewater (DWW) collected from a local water reclamation plant; and gradually shifting to a mono-type carbon source synthetic wastewater (SWW) combined with DDW (CWW) and finally SWW; was investigated in this study. The total COD concentrations of influent DWW and CWW/SWW were 413.6 ± 80.8 mg/L and 454.9 ± 51.3 mg/L, ...


    By IWA Publishing

  • Application of biofilm reactors to improve ammonia oxidation in low nitrogen loaded wastewater

    An airlift reactor using zeolite particles as carrier material was used for the nitrification of effluents from the aquaculture industry. During the start-up the nitrogen concentration was kept around 100 mg NH4+-N/L to develop the nitrifying population. Later it was decreased down to around 3 mg NH4+-N/L and the dilution rate was increased up to 4.8 d-1 in order to simulate the conditions in a ...


    By IWA Publishing

  • Treatment of winery wastewater in a full-scale fixed bed biofilm reactor

    ABSTRACTThe treatment of winery wastewater was performed at full-scale applying a two-stage fixed bed biofilm reactor (FBBR) system for the discharge in the sewerage. The results of the first year of operation at the full-scale plant are presented. Values of removed organic loads and effluent concentrations were interpreted on the basis of the COD fractionation of influent wastewater assessed ...


    By IWA Publishing

  • Degradation of aromatic compounds using moving bed biofilm reactors

    The removal of toxic phenolic compounds from industrial wastewater is an important issue to be addressed. Phenolic compounds such as phenol, hydroquinone and pyrogallol are used in different industries which end into their wastewaters. They are considered as priority pollutants because of their high toxicity at low concentrations. Phenol is an important raw material in petrochemical, ...


    By University of Tehran

  • Characteristics of municipal wastewater treatment by moving-bed biofilm reactor

    In this paper, the bio-activity of activated sludge was investigated using Oxygen Uptake Rate (OUR) as an indicator. The activity of ammonium oxidation and COD removal of both attached- and suspended-growth sludge was determined under different temperature and organic loading rates. The experimental results indicated that at 5°C, the nitrification activity was about 60% of that at 18°C. The ...


    By Inderscience Publishers

  • Impact of precipitation on the treatment of real ion-exchange brine using the H2-based membrane biofilm reactor

    The H2-based membrane biofilm reactor (MBfR) was used to remove nitrate and perchlorate from real ion-exchange brine at two different salinities (30- and 50-g/L NaCl). Base production from nitrate reduction to N2 gas caused the pH to increase, and this exacerbated precipitation of calcium and magnesium carbonates onto the MBfR fibers. The precipitates lowered the H2 flux to the biofilm and caused ...


    By IWA Publishing

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