air flotation Articles

  • Flotation processes

    Flotation is a process that involves producing small air bubbles in the water being treated. The bubbles then attach to floc particles produced by coagulation (Link?) and flocculation (Link?). The resulting bubble-floc agglomerates are buoyant and so float to the surface of the water where they accumulate as a floating layer of sludge, known as float, before being removed. ...


    By IWA Publishing

  • Practical dissolved-air flotation experience

    In this report the performance of the Bayer Flotation Technology BayFlotech? is demonstrated by comparing process data with figures published by the German Deutsche Vereinigung fur Wasserwirtschaft, Abwasser und Abfall e.V. (ATV) and Verband Deutscher Maschinen u. Anlagenbau e.V. (VDMA) associations. In addition experience gained under plant operation is described. Inter alia the relation between ...


    By Inderscience Publishers

  • Wastewater Treatment: Dissloved Air Flotation (DAF)

    Wastewater Treatment:  Dissolved Air Flotation (DAF) Filtration leads to water savings.  DAF pretreatment in the food industry can provide sustainable water cost savings.  Stuart Ward of Process Engineered Water Equipment, LLC explains efficient filtration is key.  Columbus Salame, South ...


  • Pulp & Paper Water Treatment - A look at optimizing water resource management

    Application Case Study (Pulp/Paper Operations) The pulp and paper industry has traditionally been a consumer of large amounts of fresh water and power. Recently, increased focus has been given to the optimized efficiency of paper mills and to the environmental sustainability footprint of the industry. Therefore, water resource management has become a more critical factor ...

  • Studies on coal flotation in flotation column using statistical technique

    Flotation of Indian high ash coking coal fines to obtain clean coal has been reported earlier by many authors. Here an attempt has been made to systematically analyse factors influencing the flotation process using statistical design of experiments technique. Studies carried out in a 100 mm diameter column using factorial design to establish weightage of factors such as feed rate, air rate and ...


    By Inderscience Publishers

  • Intensification of flotation treatment by exposure to vibration

    In this paper, an intensification of wastewater flotation treatment by exposure to vibration is studied. Exposure to vibration results in the decrease of air bubble size, increase of air flow through the aerator and more even dispersion of air bubbles in water. This intensifies the aeration process, thus significantly improving the treatment efficiency. A multistage model of flotation kinetics ...


    By IWA Publishing

  • Seven Ways Your Facility Isn’t Meeting Effluent Regulations and How to Solve Them

    Whether you own, operate, or help manage a municipal or industrial facility that deals with wastewater, it’s important to understand how wastewater treatment can play a significant role in the overall health of your business, especially when it comes to meeting effluent regulations. This is an important part of the wastewater treatment process to consider, as ignoring it could earn your ...


    By SAMCO Technologies, Inc.

  • Typical Matters Appear in the Flotation Process

    Ore flotation equipment is suitable for sorting non-ferrous metal black, and applied for non-metal, such as coal, fluorite, talc. The ore flotation equipment is driven by an electric motor triangle driving the impeller rotating, resulting centrifugal effect and forming negative pressure, on the one hand inhalation of sufficient air and slurry mixture, while stirring the slurry with drugs, at same ...


    By Fote Machinery

  • Dissolved-air flotation associated with an anaerobic reactor, as applied to sewage treatment

    This paper presents the results of a study performed with a pilot sewage treatment plant consisting of an aerobic reactor followed by a flotation unit. To coagulate the anaerobic effluent, different ferric chloride dosages were applied by adopting two approaches: applying constant dosages during the essay and varying the dosages according to the anaerobic effluent turbidity. To obtain more than ...


    By Inderscience Publishers

  • Two- and three-phase simulations of an ill-functioning dissolved-air flotation tank

    Computational Fluid Dynamics (CFD) simulations were employed to examine the performance of a large-scale Dissolved-Air Flotation (DAF) tank. The tank was ill-functioning as it was operated with bubbles larger than designed for. Different multiphase models, turbulence models and boundary conditions for the free surface of the tank were tested in 2D simulations. The simulation results were assessed ...


    By Inderscience Publishers

  • Dissolved air flotation separation for pretreatment of membrane bioreactor in domestic wastewater treatment

    Due to requiring higher water quality standards over time, new technologies are being employed for wastewater treatment. Dissolved air flotation (DAF) and membrane bioreactor (MBR) technologies are widely employed as new technologies in wastewater treatment. DAF is used due to its excellent separation capability of suspended solids as well as oily material. MBR is used because it may provide a ...


    By IWA Publishing

  • One-step analysis of bubble-particle capture interaction in dissolved-air flotation

    The capture of particles by air microbubbles in dissolved air flotation has been analysed using a one-step (holistic) approach, which numerically solved the motion equation (with the inclusion of microhydrodynamic resistance functions and surface forces) for both the bubble-particle collision and attachment interactions. Model predictions with the inclusion of non-DLVO attractive surface force ...


    By Inderscience Publishers

  • Treatment of Spent Filter Backwash Wastewater Using Dissolved Air Flotation Process

    Spent Filter Backwash Water (SWW) is a major recycle stream that accounts for 10% (about 30 mgd) of the average flow at Blue Plains Advanced Wastewater Treatment Plant (AWTP) and a similar proportion of nitrification and denitrification treatment process capacity (DCWASA Focus, November 2004). The peak SWW flow and load result from increased filter washing during high flow events. The combined ...

  • Two-phase simulations of an off-nominally operating dissolved-air flotation tank

    The flow patterns of the contaminated water and the air bubbles inside a large-scale Dissolved Air Flotation (DAF) tank were examined using CFD modelling. The DAF tank was operating off-nominally in the sense that it was supplied with bubbles larger than originally designed for. Attention was drawn to the location for air injection and the effect of having more than one-size bubbles in the tank, ...


    By Inderscience Publishers

  • The development and application of centrifugal flotation systems in wastewater treatment

    Flotation as a wastewater treatment technique is designed to remove all particles generally encountered as very fine emulsions, suspended solids, and colloids from wastewater. Historically, Dissolved Air Flotation (DAF) has been used to achieve this removal. More recently, other flotation techniques such as induced air, electro, cavitational, and Centrifugal Flotation Systems (CFS) have been ...


    By Inderscience Publishers

  • Simple protocols for assessing dissolved air flotation systems: quantification of released air, bubble density and cloud patterns

    Dissolved air flotation (DAF) systems are useful for many water treatment applications. Optimizing a DAF system can be very difficult and complicated due to a multitude of variables that contribute to effective separation. Pressure, temperature, retention time and air mixing affect the ability of the saturator to increase air solubility, while baffle heights, flow rates and recycle ratios affect ...


    By IWA Publishing

  • A novel multistage kinetic modeling of flotation for wastewater treatment

    This study develops a new model for description of flotation kinetics. It defines flotation as a process that consists of several stages: separated air bubbles and particles, air bubbles and particles forming an aggregate, aggregate rising to the froth layer. This description significantly differs from known models, which are much simplified. The multistage model gives a novel in-depth ...


    By IWA Publishing

  • Air bubble and oil droplet interactions in centrifugal fields during air-sparged hydrocyclone flotation

    The interactions of air bubbles and oil droplets in centrifugal flotation have been considered with respect to process conditions present during Air-sparged Hydrocyclone (ASH) flotation. Encounter efficiency of oil droplets with air bubbles has been found to be significantly smaller when compared to encounter efficiency of mineral particles. Collision and sliding contact times have been ...


    By Inderscience Publishers

  • Bioremoval of toxic metals from aqueous mixtures and recovery of biomass by dispersed-air flotation

    In the present paper the solid/liquid separation of suspended, metals-loaded biomass was mainly studied by successfully applying flotation. Industrial non-living biomass samples of different origins have been tried in the laboratory as sorbents of metal ions, with particular emphasis on Streptomyces rimosus, an effective for this purpose biomass. Dispersed-air flotation was used as the harvesting ...


    By Inderscience Publishers

  • Evaluation of flow hydrodynamics in a pilot-scale dissolved air flotation tank: a comparison between CFD and experimental measurements

    Computational fluid dynamics (CFD) models of dissolved air flotation (DAF) have shown formation of stratified flow (back and forth horizontal flow layers at the top of the separation zone) and its impact on improved DAF efficiency. However, there has been a lack of experimental validation of CFD predictions, especially in the presence of solid particles. In this work, for the first time, both ...


    By IWA Publishing

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