fine bubble diffuser system Articles

  • Reverse flexing as a physical/mechanical treatment to mitigate fouling of fine bubble diffusers

    Achieving energy neutrality has shifted focus towards aeration system optimization, due to the high energy consumption of aeration processes in modern advanced wastewater treatment plants. A study on fine bubble diffuser fouling and mitigation, quantified by dynamic wet pressure (DWP), oxygen transfer efficiency and alpha was carried out in Blue Plains, Washington, DC. Four polyurethane fine ...


    By IWA Publishing

  • Design of fine-bubble aeration systems for municipal WWTPs with high sea salt concentrations

    The impact of sea salt on the aeration coefficient kLa of fine-bubble aeration systems was investigated in clean water and in a model substance for simulating activated sludge. The investigations were carried out at laboratory and pilot scale. Sea salt was dosed in the form of artificial seawater, real seawater or simplified, by adding NaCl. The investigated media showed an increase of ...


    By IWA Publishing

  • Benefits of Venturi Injection Versus Diffuser

    Over the last twenty years I have witnessed Ozone laundry companies come and go. I have witnessed outlandish claims from some of these companies, and quite frankly am tired of listening to the outright lies and fallacies that some of these companies are stating. I would like to look at some of the facts and hope to help our readers make an educated decision about ozone laundry. This month, ...


    By Absolute Systems Inc.

  • Assessment of diffuser pressure loss on WWTPs in Baden-Württemberg

    Aeration of activated sludge is a critical treatment step for the operation of activated sludge plants. To achieve a cost effective treatment process, assessing and benchmarking of aeration system performance are important measures. A simple means of gauging the relative condition of a fine bubble diffused aeration system is to evaluate the pressure loss of the diffusers as oxygen transfer tests ...


    By IWA Publishing

  • Full scale evaluation of diffuser ageing with clean water oxygen transfer tests

    Aeration is a crucial part of the biological wastewater treatment in activated sludge systems and the main energy user of WWTPs. Approximately 50 to 60% of the total energy consumption of a WWTP can be attributed to the aeration system. The performance of the aeration system, and in the case of fine bubble diffused aeration the diffuser performance, has a significant impact on the overall plant ...


    By IWA Publishing

  • Activated Sludge Diffusion Provides Cost Effective Biological Odor Control at Two Texas Wastewater Treatment Facilities

    ABSTRACTDuring recent expansions of the Rowlett Creek Regional WWTP in Plano, Texas and the Wilson Creek Regional WWTP in Lucas, Texas, activated sludge diffusion (ASD) biological odor control systems were installed to treat hydrogen sulfide (H2S) and other gaseous compounds. The ASD systems treat foul air collected from various sources, including headworks and primary distribution structures, ...

  • Alpha Factors in Full-Scale Wastewater Aeration Systems

    ABSTRACTSurface active agents depress gas transfer at gas-liquid interfaces. They are present as measurable trace contaminants at all environmental and at most industrial gas-liquid interfaces. This paper presents the results of several studies, including lab and full scale studies that show the depression of gas transfer, usually quantified by the alpha factor, can be related to the Reynolds ...

  • Improving Efficiency and Reducing Energy and Maintenance Costs in Aeration Systems

    Energy costs for operating an aeration system in a biological wastewater treatment plant often times exceeds 75% of the total energy costs for the plant. Adding in blower and diffuser maintenance costs, Aeration Systems are easily the most costly portion of the treatment process, many times consuming so many resources that other parts of the plant may not be properly maintained or operated. By ...

  • Innovative system reduces ammonia at Hawick Sewage Treatment Works

    Hawick Treatment Works has reduced its ammonia discharge thanks to an innovative aeration system installed by market leaders Suprafilt. Aeration experts Suprafilt designed a highly efficient system using MF1100 plate diffusers, which increased the amount of oxygen to the site providing an instantaneous reduction in ammonia levels. The company, who are market leaders in designing and ...


    By Water Active Ltd

  • The CaroMont Health Ozone Laundry System

    Abstract Ozone generating equipment was retrofit into the laundry washroom of the Gaston Memorial Hospital in Gastonia, NC, and began operating in the early part of July, 2010. Three ozone generating systems service six washer-extractors in the washroom. The performance of this fine-bubble ozone diffusion laundering system has been monitored since that time, with various adjustments made ...


    By ClearWater Tech LLC

  • Fixed vs. Moving Bed Systems: Aeration and Mixing Efficiency

    The aeration design for a biofilm system, such as moving bed or AccuFAS fixed-film systems, is more complex than a standard activated sludge system. In a biofilm system, the aeration design must satisfy the oxygen demand for required treatment, provide mixing, and control biofilm ...


    By Brentwood Industries, Inc.

  • Submerged Fixed Film: Top 5 Considerations for Evaluating Different Systems

    Submerged fixed-film systems are ideal for significantly increasing nitrification in existing wastewater treatment plants. A well-designed and operated system can double the nitrification capacity of an existing aeration basin. ...


    By Brentwood Industries, Inc.

  • KLa Slot injector™ Aeration system assists cheese & Whey production plant solve its Nitrogen discharge challenge - Case Study

    The Challenge A gourmet cheese, whey protein, and lactose production facility located in the Midwest had been utilizing a land application system for effluent discharge for over 40 years. Using a combination of ridge and furrow and spray irrigation, the plant had many years of success applying their wastewater to the land. However, as the gourmet cheese products gained in popularity along ...


    By KLa Systems, Inc.

  • Prairie farm rehabilitation administration paper

    The aeration efficiency of two types of aeration devices, air injection and mechanical surface aerators was evaluated in farm dugouts in the Peace River Region of Alberta. The air injection systems were tested using three types of diffusers; open-ended tubing, linear fine bubble diffusers and a membrane diffuser. Our results indicate that without aeration, anoxia can develop in the bottom of ...


    By EP Aeration

  • Use of Mass Balances for the Determination of Oxygen Contribution of the Different Air Sources in a Full-Scale Membrane Bioreactor

    MBRs necessitate two sources of aeration: one for scouring the membranes (coarse bubble, CB) and the other for the biomass requirements (usually fine bubble, FB). In the framework of a in-depth study of a full scale municipal MBR plant (10 000 p.e.) where CB and FB are in the same tank (Biosep®), mass balances were used to determine the OTR of the different combinations of CB+FB at different air ...

  • In Situ Local Parameter Measurements for CFD Modeling to Optimize Aeration

    ABSTRACTMeasurement methods to determine in situ local parameters were developed, in order to optimize design and operating parameters impacting oxygen transfer in aeration tanks equipped with EDPM membrane diffusers and slow speed mixers. New tools to measure bubble sizes and gas hold-ups were coupled with the traditional ones used to determine liquid velocities and oxygen transfer coefficients. ...

  • Monitoring the variations of the oxygen transfer rate in a full scale membrane bioreactor using daily mass balances

    Oxygen transfer in biological wastewater treatment processes with high sludge concentration, such as membrane bioreactor (MBR), is an important issue. The variation of α-factor versus mixed liquor suspended solids (MLSS) concentration was investigated in a full scale MBR plant under process conditions, using mass balances. Exhaustive data from the Supervisory Control And Data Acquisition (SCADA) ...


    By IWA Publishing

  • Central Kitsap (USA) Municipal WWTP - Case Study

    Number of Tanks: 4 Total Volume: 13,080 m³ Water Depth: 4.75 m SOTR Standard Oxygen Transfer Rate: 1,240 kgO2/h Total Airflow: 10,800 Nm3/h Total AEROSTRIP® Diffusers: 1,214 The Central Kitsap facility started operations in 1979 as a conventional activated sludge ...


    By Aquaconsult Anlagenbau GmbH

  • A realistic dynamic blower energy consumption model for wastewater applications

    At wastewater treatment plants (WWTPs) aeration is the largest energy consumer. This high energy consumption requires an accurate assessment in view of plant optimization. Despite the ever increasing detail in process models, models for energy production still lack detail to enable a global optimization of WWTPs. A new dynamic model for a more accurate prediction of aeration energy costs in ...


    By IWA Publishing

  • Oxygen, the fix for pond problems

    Aeration of a water feature should have three main considerations. These include preventing thermal stratification, balancing the dissolved oxygen levels throughout the water column from the sludge or benthic layer to the surface and balancing temperature levels throughout the water column. Although oxygen transfer from certain methods may be significant, the greatest amount of oxygenation takes ...


    By EP Aeration

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