clarifier unit Articles

  • Clarifier maintenance

    Clarifiers are expensive, to buy or repair, and their downtime can be costly in fines imposed by regulatory agencies and in community ill will. Regular maintenance, an annual inspection of the mechanism and an occasional touchup of the paint or coating system are simple and inexpensive proactive steps that will usually prevent most problems. Three components of all clarifiers require maintenance: ...


    By WesTech Engineering, Inc.

  • Mining clarifier overflow

    Project Profile: Clarifier Overflow Water Polishing: PFD  Data: End User: US Energy Location: Crested  Butte, CO Commissioned: Spring, 2010 Units: (1) model STiR-50V (50 ft2/filter) Flow Rate: 300 gpm (0.5 Million gallons of water per day) ...


    By Filtra Systems

  • Controlling Sludge in Lamella Clarifiers

    This month we are focusing on the control of sludge blanket build up in Lamella Clarifiers. Lamella Clarifiers, also known as Inclined Plate Separators (IPS) are in common use at Waste Water Treatment Sites as small footprint plant settlement units and are often employed in ...


    By Partech (Electronics) Ltd.

  • Rectangular vs. Circular Clarifiers: Which is better?

    Both rectangular and circular configurations have been commonly used in clarifier basins. The relative merits of the two have been discussed at length for decades. Historically, the selection of rectangular versus circular clarifiers has been based on past experience and the preference of the design engineer or design company. Initial wastewater treatment plant designs in the United States were ...


    By Brentwood Industries, Inc.

  • 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 ...

  • 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 ...

  • 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 ...

  • Chemically enhancing primary clarifiers: model-based development of a dosing controller and full-scale implementation

    Chemically enhanced primary treatment (CEPT) can be used to mitigate the adverse effect of wet weather flow on wastewater treatment processes. In particular, it can reduce the particulate pollution load to subsequent secondary unit processes, such as biofiltration, which may suffer from clogging by an overload of particulate matter. In this paper, a simple primary clarifier model able to take ...


    By IWA Publishing

  • 50 GPM Parallel Plate Clarifier for raw water treatment at a chemical manufacturing plant

    Challenge A chemical manufacturing company needed to clarify surface water that was being drawn from a local creek for use as a cooling agent in their manufacturing process. The existing system was 30-years old, corroded, and not very adept at handling solids after separation from the water. Space requirements were a limiting factor in the installation. ...

  • Atmospheric dispersion modelling for regulatory purposes in the United Kingdom

    Short-range atmospheric dispersion models are used to assess the environmental impact of airborne pollutants from industrial plants. The results are of interest to a range of specialist and non-specialist groups, including regulators, operators, environmental organisations, and local residents. In order that these groups can be well-informed, it is important to develop clear and consistent ...


    By Inderscience Publishers

  • 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 ...

  • Foam control in a food processing wastewater SBR treatment unit case study

    Cost-Effective Biological Foam Control Using Microcat DF Defoamer The sequencing batch reactor activated sludge plant (SBR) operating on a potato processing wastewater is experiencing a severe foaming episode. The foam can reach three inches in depth reducing the efficiency of the surface aerators and causing odors. The treatment system consists of primary filtration and an SBR aeration ...


    By Bioscience, Inc.

  • EPA Clean Water Act: New Regulations re: `Waters of the United States`

    The Environmental Protection Agency (EPA) published a final rule defining the scope of waters protected under the Clean Water Act… The rule will ensure protection for the nation’s public health and aquatic resources, and increase CWA program predictability and consistency by clarifying the scope of ‘‘waters of the United States’’ protected under the ...

  • A novel super-cooled humidification?dehumidification system driven by thermal vapour compression unit for seawater desalination

    The current study presents the concept of a novel seawater desalination system that is configured by a humidification?dehumidification unit based on the vapour-compression process (HDDTVC). The coupled refrigeration unit employs the thermal compression of vapour by a jet-ejector. The new technical idea of proposed desalination system depends mainly upon the creation of a super-cooled temperature ...


    By Inderscience Publishers

  • Egg Processing

    Problem: This eggplant, located in Southern California, pro¬duces approximately 6 million eggs per week. During the process and preparation of these eggs, some break and fall on the floor where they are washed into floor drains and mixed with the egg wash water. The mixture of broken eggs and wash water is discharged to a balance tank and then sent through a settling ...


    By HydroCal Inc.

  • Energy Usage and Control at a Membrane Bioreactor Facility

    Membrane bioreactor (MBR) treatment has come of age in the United States, and is now considered for advanced treatment on facilities of 15 mgd and more. It offers the advantages of high clarity effluent without secondary clarifiers or filters, and the capability to perform in a very compact layout and configuration. As utility agencies consider MBR treatment, they may tend to overlook its high ...

  • 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 ...

  • Ulpha WTW - Actiflo for Crypto and Mn Removal

    United Utilities Maximum flow 22037 m3/day The Client United Utilities are the 2nd largest water company in England and Wales, responsible for an area in the north west of the UK including major cities such as Manchester and Liverpool. The Client's Needs Ulpha WTW is located near Millom in Cumbria in the Lake ...


  • Wastewater-Primary Treatment

    Primary Treatment is defined as a wastewater treatment process that takes place in a rectangular or circular tank and allows those substances in wastewater that readily settle or float to be separated from the water being treated. This process achieves solids separation. The solids readily available to settle to achieve sedimentation will do so in a settling tank referred as a clarifier. On the ...

  • ENEL power, italy – fusina project – ZLD plant for FGD wastewater treatment

    The Facility The Fusina Power Plant is equipped with four coal-fired units with a total capacity of 975 MW capacity (1 x 165 MW + 1 x 170 MW + 2 x 320 MW). The Environmental Refurbishment (Flue Gas Desulpharization, (FGD)) project includes a new DeSOx system for common for units #1 & 2; two DeNOx systems, one each for unit #1 & 2. Units #3 & 4 are already equipped with DeSOx ...

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