clarifier operation Articles

  • Stress Free Clarifier Operation: Use of State-Point Analysis to make Secondary Clarifier Operating Decisions at Northwest Cobb WRF

     ABSTRACT The Northwest Cobb Water Reclamation Facility, located northwest of Atlanta, Georgia is owned and operated by the Cobb County Water System. During 2003, the plant began experiencing some settling problems, and blanket levels began to rise. To address this issue and avoid any potential compliance problems, the plant staff focused on analyzing the clarifier operation, and using ...

  • Putting Operators in Control a Straightforward Approach to BNR Clarifier Operation

     ABSTRACT Successful operation of any activated sludge process depends on understanding the capacity of secondary clarifiers. As biological treatment facilities are operated to achieve biological nutrient removal (BNR), a careful balance must be made between reactor and secondary clarifier capacity to achieve the various treatment goals. This paper presents an approach to assist ...

  • 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 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.

  • 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.

  • Separation of solids and disinfection for agronomical use of the effluent from a UASB reactor

    The present work addresses the preparation of the effluent from a full-scale upflow anaerobic sludge blanket (UASB) reactor for drip irrigation of orange crops. The pilot plant included a lamella plate clarifier followed by a geo-textile blanket filter and a UV disinfection reactor. The clarifier operated with a surface load of 115 m3m−2d−1, whereas the filter ...


    By IWA Publishing

  • Fluence’s MABR at the Codiga Resource Recovery Center

    A Membrane Aerated Biofilm Reactor (MABR) manufactured by Fluence Corporation (Fluence) was installed at Stanford’s Codiga Resource Recovery Center (CR2C) in January 2018. The system was tested with domestic wastewater diverted from Stanford’s sanitary sewer. Treatment performance was evaluated according to two benchmarks: California Title 22 standards for non-potable water reuse (T22) and a ...


    By Fluence Corporation

  • A Site-Specific Tool for Optimizing Final Clarifier Design and Operation

    The final clarifier is one of the most important unit processes and often determines the capacity of a treatment plant. Clarification is a solids separation process, which results in the removal of 99 percent or more of the suspended solids (biological floc) received from the activated sludge system. The separated solids are transported to the bottom of the clarifier and removed as return ...

  • High Rate Treatment of CSO/SSO Flows Using a High Density Solids Contact Clarifier/Thickener - Results from a Pilot Study

    ABSTRACT A two-month pilot study was conducted at the Village Creek Wastewater Treatment Plant in Birmingham, Alabama to test the technical feasibility of utilizing a ...

  • NEFCO, incorporated case history

    In mid-2007, the wastewater treatment plant in Monclova Mexico was faced with a dilemma. The City had just upgraded their biological treatment scheme to increase flow through their plant by 35%, from approximately 11.5 mgd to15.5 mgd. They needed to add either a fourth secondary clarifier to keep within they discharge limits of 10 ppm TSS, or improve the operation of their three existing ...


    By NEFCO, Inc.

  • Replacement of 130 ft Secondary Clarifiers at a 25 MGD wastewater treatment facility

    Challenge A municipal WWTP found that (2) of their secondary clarifiers were too rusted and corroded to properly function. A traditional clarifier refurbishment consisting of sandblasting and painting was not a viable option because one of the clarifier rake arms had recently broken due to its poor condition. The plant engineers decided that a clarifier rebuild was necessary to ensure ...

  • Innovative use of lamella clarifiers for central stormwater treatment in separate sewer systems

    Lamella settlers have been used in the past few years for the sedimentation of particles in wastewater and stormwater applications. A new and very innovative approach for the treatment of stormwater flows is proposed which extends the portfolio of solutions beyond traditional settling tanks. Surface runoff is stored in a sewer or a basin and finally treated in a small but continuously operated ...


    By IWA Publishing

  • High Rate Clarifier Start-up and Operation in Shreveport, Louisiana

     ABSTRACT In 2004, the city of Shreveport received permits from the Louisiana Department of Environmental Quality and the U.S. Environmental Protection Agency to construct and operate a high rate clarifier (HRC) at both the North Regional and Lucas wastewater treatment plants. The HRC provides wastewater treatment for flow in excess of the peak plant capacities. Each HRC unit uses ...

  • 600 MLD Membrane Bioreactor for Tertiary Nitrification in Hamilton, Ontario

    The City of Hamilton is faced with increasing pressure from growth and development, greater wet weather treatment needs, and stringent effluent targets. In order to address these challenges, the City of Hamilton has initiated an ambitious program to identify alternative upgrade options for the Woodward Avenue WWTP. One of the alternatives identified for further investigation is a tertiary ...

  • Prevention of Seasonal Algae Issues In Source Water

    Problem: Season algae issues occur with a Blue-Green Algae (Cyanobacteria) growth in the Attalla, MS Source Water. The Source is Big Black River, which leads into a 60 Day pond, then to a 7 day pond. Previously, they had not been able to apply traditional treatments, and the algae growth was increasingly worse every year. The growth began in ...

  • Commissioning and Operation of a 50 MGD Ultrafiltration Advanced Reclamation Facility for Gwinnett County, Georgia

    Gwinnett County, located near Atlanta, Georgia, is one of the fastest growing counties in the nation. A new 20 mgd state-of-the-art water reclamation and processing facility, called the F. Wayne Hill Water Resources Center, became operational in December 2000 and is being expanded to triple its capacity to 60 mgd (maximum month flow basis). The expanded plant will produce high-quality “product ...

  • Increased plant efficiency, City of Checotah, Oklahoma

    The City of Checotah, Oklahoma was experiencing excessive solids, foam and grease in their 0.5 MGD extended aeration activated sludge treatment facility. With a daily average flow of 0.25 million gallons per day, the plant had tremendous amounts of foam and grease in the aeration basin with the sidewalls caked with sludge. The centerwells of the clarifier were filled with foam and grease. The ...


    By Byo-Gon, Inc.

  • Environmental Protection Agency (EPA) announces the launch of the “2010/15 PFOA Stewardship Program`

    On January 25, 2006 , the U.S. Environmental Protection Agency (EPA) announced, via a teleconference and press release, the launch of the “2010/15 PFOA Stewardship Program,” a global stewardship program designed to reduce emissions of perfluorooctanoic acid (PFOA) and related chemicals. Materials on the program can be found on EPA's updated PFOA webpage, ...


    By Bergeson & Campbell, P.C.

  • Conversion of the RAS control at the WWTP Asselbrunn to sludge level

    The paper presents the effects of gradual upgrade of existing secondary clarifiers of the waste water treatment plant (WWTP) Asselbrunn. From existing two clarifiers at the beginning only one has been modified (clarifier no. 2), while the other remained unchanged (clarifier no. 1). In a first step the intake structure of clarifier no. 2 has been modified at flow proportional return activated ...


    By BITControl GmbH

  • Prepare now

    For readers not following Proposition 65 (Prop 65) changes, you need to read this column. Big changes are in store for regulated entities subject to Prop 65 based on a rule implemented in August 2016, but with a fast-approaching enforcement date of Aug. 30, 2018. Prop 65 requires businesses to notify Californians about significant amounts of listed carcinogens and reproductive chemicals in the ...


    By Acta Group

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