current baffle Articles

  • NEFCO density current Baffle design

    The study was originally conceived to evaluate the performance of the NEFCO Stamford Baffle design and several variations on that design to better understand the parameters that affected baffle performance. To that end, the plan was straightforward. The first step was the simulation of a 70-ft diameter clarifier. This clarifier would serve as the test bed to calculate the predicted effectiveness ...


    By NEFCO, Inc.

  • The use of the anaerobic baffled reactor for wastewater treatment: A review

    A review concerning the development, applicability and possible future application of the anaerobic baffled reactor for wastewater treatment is presented. The reactor design has been developed since the early 1980s and has several advantages over well established systems such as the upflow anaerobic sludge blanket and the anaerobic filter. These include: better resilience to hydraulic and organic ...


    By United Utilities

  • The anaerobic baffled reactor (ABR) treating communal wastewater under mesophilic conditions: a review

    A review concerning the anaerobic baffled reactor (ABR) treating communal wastewater under mesophilic conditions is presented. Existing studies indicate strong resilience of the reactor towards loading variations and shock-loads. The compartmentalisation of the ABR is a strongly stabilising factor with feed fluctuations being evened out across reactor chambers. Significant chemical oxygen ...


    By IWA Publishing

  • NEFCO™ Awarded new patents case study

    NEFCO™ has been granted two new patents for its Dual Surface Baffle System. The Dual Surface Baffle was developed from work done as a part of NEFCO’s on-going Computational Fluid Dynamics (CFD) Density Current Baffle Study. The first, US Patent No. 7,556,157, describes a Dual Surface Baffle with a curved lower baffle segment. The second, US Patent No. 7,726,494, describes a Dual ...


    By NEFCO, Inc.

  • NEFCO’s CFD study case study

    The study was originally conceived to evaluate the performance of the NEFCO Stamford Baffle design and several variations on that design to better understand the parameters that affected baffle performance. To that end, the plan was straightforward. The first step was the simulation of a 70-ft diameter clarifier. This clarifier would serve as the test bed to calculate the predicted effectiveness ...


    By NEFCO, Inc.

  • The Monclova experience case study

    The Town of Monclova, Mexico found it necessary to increase the hydraulic capacity of its municipal wastewater treatment plant by 35% – from approximately 11.5 MGD to 15.5 MGD. The increase in flow was accomplished by upgrading the plant’s biological treatment process. Once the modifications were completed, the flow through the plant was gradually increased. As the increased flow ...


    By NEFCO, Inc.

  • Development of a flocculation sub-model for a 3-D CFD model based on rectangular settling tanks

    To assess performance and evaluate alternatives to improve the efficiency of rectangular Gould II type final settling tanks (FSTs), New York City Department of Environmental Protection and City College of NY developed a 3D computer model depicting the actual structural configuration of the tanks and the current and proposed hydraulic and solids loading rates. Fluent 6.3.26™ was the base platform ...


    By IWA Publishing

  • A Simple Solution to Big Snail Problems - A Case Study at VSFCD’s Ryder Street Wastewater Treatment Plant

    A treatment facility operating on the northern edge of the San Francisco Bay, in Vallejo, California, was experiencing excessive growth of trickling filter snails in the plant’s two biotowers. Downstream of the biotowers, the snail shells would settle in the plant’s aeration basins and secondary clarifiers and cause major maintenance problems. Periodically the entire aeration basin and clarifier ...

  • Evaluation of DEWATS in Java, Indonesia

    Under the Indonesian PPSP (Accelerated Sanitation Development for Human Settlements Program) thousands of new DEWATS (Decentralized Wastewater Treatment Systems) may be realized in the coming five years. Taking the massive scale of planned implementation into consideration an evaluation of the technical and financial-economic aspects and users' involvement for three different types of ...


    By IWA Publishing

  • Biosurfactant produced by a Rhodococcus erythropolis mutant as an oil spill response agent

    Biosurfactants have been considered as superior alternatives to currently used surfactants as they are generally more biodegradable, less toxic, and better at enhancing biodegradation. However, the application of biosurfactants is limited by the availability of economic biosurfactants and the corresponding producers that can work effectively. Hyperproducers generated by metabolic engineering ...


    By IWA Publishing

  • Lightweight concrete mix profitable using heavyweight batch mixer

    To increase production of concrete mixes containing coal fired power generation plant ash products, Charah Inc. opened a new manufacturing plant in Emporia, VA, which also serves as a warehouse and distribution center for other concrete industry products. Profit margins are slim in this high volume business, so management placed great emphasis on the capital and operational costs of the equipment ...

  • Ozone Brings Better Bottled Water

    The proliferation of bottled beverages worldwide and an increased awareness of consumer health issues have beverage bottlers rethinking how to keep their liquids safe for consumption. One problem they face is the need to deliver a product that is free of bacteria, to provide extended shelf life and product quality. Ozone has quickly become the disinfectant of choice among water bottlers ...

  • Mixed MSW composting is steady as she goes

    Two new facilities came on line in 2006, while one ceased operation and a second is shifting to a new technology. Annual survey identifies a total of 14 plants. Part I STEADY-STATE may be the best phrase to describe the status of facilities composting mixed municipal solid waste in the United States. In fact, steady-state may be the best phrase to describe solid waste composting in general since ...


    By BioCycle Magazine

  • Decentralized wastewater management in Kieu Ky Vietnam

    1. Overview and Key Points In order to eliminate the common ‘out of sight out of mind approach’ in sanitation, whereby sewers and/or drains are discharged into rivers, a Decentralized Wastewater Treatment System (DEWATS) was designed and implemented in Kieu Ky to treat wastewaters arising residential properties and various craft industries. A clear understanding of topography, ...


    By IWA Publishing

  • Water system master plan

    Client: City of Fort Smith, Ark. Completion Date: 2002 Services Provided Water supply/delivery Hydraulic modeling and design Water quality analyses Water supply hydrology Flood hydrology 3-D project rendering Physical hydraulic models Spillway hydraulics ...


    By Burns & McDonnell

  • How to Save with Cooling Tower Credits

    Cooling towers dissipate heat from recirculating water used to cool chillers, air conditioners, or other process equipment to the ambient air. Heat is rejected to the environment from cooling towers through the process of evaporation. Therefore, by design, cooling towers use significant amounts of water. The thermal efficiency and longevity of the cooling tower and equipment depend on the proper ...


    By WaterSignal

  • Rotary batch blenders help DIP get pre-mixes to market fast

    Mixers are more efficient than double-cone units Ductil Iron Powder (DIP), Buzau, Romania, was established in 2000 as a spin-off of Ductil Steel. Its products are iron and alloyed powders for use in powder metallurgy and welding applications. The plant for making the iron powders began operation in 1995, and by 2000 it reached its current capacity ...

  • Over the River and Through the Plants to Richland Chambers We Go

    ABSTRACTIn order to meet future water supply requirements, Tarrant Regional Water District is pursuing several options including diverting Trinity River water into two of the District’s reservoirs located downstream of the Dallas-Fort Worth Metroplex. The District’s approach to augment the water supply with reclaimed water involves a multiple-barrier approach including advanced wastewater ...

  • Solving waste oil management and removal problems in power generating plants

    If your plant is like most, it is doing a good job of preventing oily water waste and waste oils from escaping into the environment. But at what cost? As labor resources dwindle, operating and maintaining drainage systems, oil separators, and sometimes inadequate oil removal equipment is expensive. Paying higher than needed costs for waste oil disposal, filtration and water treatment due to these ...


    By Oil Skimmers, Inc.

  • South Africa`s fuel cell plan risks failure without support

    An ambitious strategy to create fuel cell products for export will need incentives and cross-government backing to bear fruit, says Radhika Perrot. South Africa's Department of Science & Technology (DST) has been laboriously pushing for the development of hydrogen fuel-cell technology through an ambitious ...


    By SciDev.Net

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