clarifier upgrading Articles

  • Upgrading Pre-Existing DAF Clarifiers

    Whether a Mill is pursuing a facility wide directive to reduce water consumption or simply looking for better performance from a presently installed DAF clarifier, the advancements discussed in this overview offer proven techniques to optimize existing DAF system operations. Significant operational cost reductions can be achieved with DAF System Upgrades. In addition, increasing DAF performance ...


    By World Water Works, Inc.

  • What is a wastewater treatment system and how does it work?

    For industrial companies producing wastewater as part of it’s process, some type of wastewater treatment system is usually necessary to ensure safety precautions and discharge regulations are met. The most appropriate wastewater treatment system will help the facility avoid harming the environment, human health, and a facility’s process or products (especially if the wastewater ...


    By SAMCO Technologies, Inc.

  • Case study - Cheese manufacturer gets aeration upgrade

    Largest Cheese Manufacturer in the UK Gets Aeration Upgrade Dairy Crest Davidstow Creamery in Camelford is the largest cheddar cheese manufacturer in the UK. The process of collecting and processing milk is a 24/7 operation, generating effluent round the clock and needing to be treated and disposed of continuously. Effluent from the cheese-making process contains high fat content and ...

  • Case study - Aeration ditch upgrade exceeds expectations

    Triton Process Aerators Meets Future Nitrogen Permit Regulations When the a Pennsylvania Sewer Authority was researching methods to improve the dissolved oxygen levels in its wastewater treatment plant’s oxidation ditches in 2001, they decided to totally replace its aging brush rotor system. They replaced the rotors with the  ...

  • Implementation of CFD modeling in the performance assessment and optimization of secondary clarifiers: the PVSC case study

    The water industry and especially the wastewater treatment sector has come under steadily increasing pressure to optimize their existing and new facilities to meet their discharge limits and reduce overall cost. Gravity separation of solids, producing clarified overflow and thickened solids underflow has long been one of the principal separation processes used in treating secondary effluent. ...


    By IWA Publishing

  • Case study - Mission accomplished: plant and aeration upgrades to meet growth and lower energy use

    In 2003 this Minnesota city began the process of upgrading its lagoon-based wastewater treatment facility (WWTF) into a new mechanical treatment facility. Nine years and two construction phases later, the city now has a fully operational facility and has upgraded its aeration system to lower energy and maintenance costs. Treatment Process The wastewater ...

  • Fluidized Fixed-Film Systems For Cost Effective Upgrade Of Existing Wastewater Treatment Plants

    As capacity demands increase and effluent quality regulations become increasingly stringent, a rising number of wastewater treatment plants across North America are in need of process upgrades. Nutrient removal requirements and high quality effluent standards for wastewater reuse have become more prevalent in recent years to safeguardaquatic habitat and conserve water resources. Upgrading large ...


  • WWTP Marines, Spain upgrading a municipal WWTP using AGAR® technology A Case Study

    Case Study: Municipal plantStart up: May 2007Capacity: 380 m3/d Abstract In view of EU directives for effluent discharge, it was required to upgrade the local sewage plant in the town of Marines, Valencia (Spain). The technology chosen for the project was AGAR® (Attached Growth Airlift Rector) of AqWise - Wise Water Technologies Ltd. La Entidad Pública de ...

  • 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.

  • 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.

  • Newport News, VA case study

    The Challenge - Retrofit The James River Treatment Plant (JRTP) is one of nine major treatment plants operated by the Hampton Roads Sanitation District (HRSD) in southeast Virginia. The JRTP discharges into the James River, a major tributary to the lower Chesapeake Bay. To meet the goals of the James River Waste Load Allocation, the Virginia Department of Environmental Quality issued HRSD a ...

  • Sharjah WWTP phase 6 - United Arab Emirates case study

    Background The existing treatment plant at Sharjah municipality needed an upgrade to handle increased fl ow and stringent demands. The target was to fi nd a solution without need for introducing any additional volumes and able to handle as much hydraulic load as possible on the existing clarifi ers. The Anox Kaldnes MBBR technology was chosen and the hydraulic capacity of the existing activated ...

  • Webitat Advanced IFAS System Addresses Common Fixed Media Concerns

    Integrated Fixed-Film/Activated Sludge (IFAS) technology has received widespread acceptance in the engineering community as the most economical new way to upgrade wastewater plants without building new aeration basins or clarifiers. BioWeb™ is a knit web-like fabric with high surface area designed to be installed directly into aeration basins to create a colony of attached growth biomass in the ...

  • Improving Wet Weather Treatment Capacity by Converting a Two-Stage Activated Sludge Process to a Single-Stage Process

    ABSTRACTThe Western Virginia Water Authority (WVWA) operates a 42 mgd wastewater treatment facility which treats flows from the City of Roanoke and adjoining municipalities. In recent years, the WVWA WPCP has experienced peak wet weather flows exceeding 140 mgd, well above the plant’s existing peak flow capacity. Under these conditions, the plant is forced to rely heavily on flow ...

  • Hoosac WQD Williamstown, MA

    An aging primary and secondary treatment facility coupled with increased loadings to the co-settling primary clarifier resulted in the need to upgrade the Hoosac WQD. An important component of the upgrade was biosolids handling. Tighe & Bond selected the belt filter press as the bases of design for this 5.37 MGD average daily flow facility. The co-settled primary and secondary sludge is ...


    By BDP Industries

  • Case study - A Sustainable system to Weather all seasons case study

    Aerator upgrades help wastewater treatment plant survive cold Vermont winters More than two decades ago, cold Vermont winters brought a small Wastewater Treatment Facility to a halt with brush rotor icing problems. A major upgrade that included the Aire-O2® aspirator aeration system ...

  • Municipal: Harestua, Norway

    Project Name: Harestua Wastewater Treatment Plant Location: Oppland County, Norway Type of Plant: Municipal - Retrofit Technology Used: Biowater CFAS Biomedia Used: Biowater BWT-X Operational Since: 2011 The Challenge The Harestua STP plant was a ...


    By Biowater Technology

  • A multi-parameter analyzer helps a Kentucky treatment plant step up to the plate and meet a new phosphorus limit in its permit

    In 2001, the Lexington Fayette Urban County Government West Hickman Creek Wastewater Treatment Plant in Nicholasville, Ky., was starting Phase II of its third upgrade since 1972, when the state imposed a phosphorus limit. Total phosphorus hovered around 6 mg/l, but the permit required 1 mg/l monthly average and 2 mg/l daily maximum from May through October. Engineers from Tetra-Tech, the ...

  • Europaper, Italy A Case Study

    Case Study: Pulp & Paper PlantClient: Siemens Water Technologies – ItalyStart Up: August 2005Capacity: 2,000 m3/d Overview Europaper produces tissues paper for Industrie Cartarie Tronchetti, which has its own branch (Foxy). Changes in the paper production were followed by an increase of the BOD load in the wastewater. Therefore the existing water ...

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