Grit Removal Articles

  • Good Advice for Winter Travel

    No Nonsense Safety during the Season of Slip-ups As many will be aware from unfortunate experience and bad news, Winter can be a very dangerous time for roads and footpaths. A multitude of risks threaten life and limb; aside from snow and ice, falling leaves mixed with wet weather are a recipe for slippery surfaces, while damp mud is another serious problem exacerbated by tractor ...


    By SHEilds Ltd

  • City Of West Palm Beach Reaches Out To Community With Proactive Approach To Manage Critical Force Main

    The City of West Palm Beach (WPB) makes a concerted effort to engage its citizens. As one of the three largest cities in South Florida, WPB is a vibrant, growing waterfront community with a population of more than 100,000. Since 1974, WPB has experienced exponential growth in its population and correspondingly, in its wastewater ...


    By Pure Technologies

  • WWTP Covers Its Grit Tanks to Help Address Odor Concerns

    The Customer: The Georgetown Wastewater Treatment Plant (WWTP) located in Ontario, Canada, provides industrial and municipal wastewater treatment for the urban area in the Town of Georgetown. The plant treats approximately 17.5 ML of wastewater per day. It is sized to accommodate the wastewater treatment needs of a local dairy processing facility, the plant’s largest industrial ...

  • Calibration using 5 flow sensors saves the effort of extensive reconstruction measures

    "Abwasserzweckverband Breisgauer Bucht", a municipal association for sewage treatment in the south of Germany, operates a central wastewater treatment plant for its members (29 communities and cities). The WWTP covers a catchment area of 650km² and its treatment capacity is 600.000 population equivalents. The plant is treating wastewater from 375.000 residents as well as from industry and ...


    By NIVUS GmbH

  • Ovivo Double Entry Drum Screens at Yellow River WRF, Gwinnett County, GA – Customer Testimonial

    “We completed the Yellow River WRF Improvements Project in 2012. This project replaced an aging 14.0 MGD conventional activated sludge facility with an advanced 22.0 MGD MBR facility. The MBR facility includes third party submerged fiber membrane for solids separation. The membrane manufacturer required, at a minimum, 2mm screening to protect the .04 micron membrane. We decided to purchase ...

  • Case study - Built for generations

    When building a wastewater treatment facility in 1984 officials in a Wisconsin village decided on an oxidation ditch design and chose Aire-O2®Aspirator aerators based on their flexibility and energy efficiency. Today, several of those aerators are still in use and the treatment facility operates at even more ...

  • Case study - Crystal lake wastewater treatment plant

    Challenge: The City of Crystal Lake is located about 45 miles northwest of Chicago with a population of nearly 45,000 people. Like many wastewater treatment plants, urban sprawl and suburban development puts the Crystal Lake Wastewater Treatment Plant near a host of commercial and residential neighbors, including a high school immediately west of the plant. Plant managers were very ...


    By OMI Industries (OMI)

  • Heard County Water Authority - Holistic approach - Case Study

    Location: Franklin, Georgia Owner: Heard County Water Authority Engineer: Hayes, James, & Associates Contractor: P.F. Moon Outdated Equipment The Heard County Water Authority serves over 380 connections in and around Franklin, Georgia. With a growing population, Heard County was beginning to  exceed the capacity of the existing wastewater treatment ...


    By WesTech Engineering, Inc.

  • Seasonal and influent characteristic effects on hydrogen sulfide generation at a water reclamation plant

    Correlations between sulfide generation and seasonal influent wastewater characteristics were identified based on a long-term monitoring program in summer and winter at a water reclamation plant. During summer, the emission rates of hydrogen sulfide (H2S) from the liquid treatment processes increased substantially compared to those during winter due to the increased wastewater temperature. The ...


    By IWA Publishing

  • Increasing the sludge energy potential of wastewater treatment plants by introducing fine mesh sieves for primary treatment

    The objective of this study was to compare some basic characteristics of sludge from fine mesh sieves (sieve sludge) with sludge from primary clarifiers (primary sludge) regarding their energy potential with a focus on anaerobic digestion and/or incineration. Nineteen samples of sludge from fine mesh sieve plants (most of them without fine screens and grit chambers as pre-treatment) and 10 ...


    By IWA Publishing

  • Occurrence and removal efficiency of six polycyclic aromatic hydrocarbons in different wastewater treatment plants

    Occurrence and removal efficiency of six polycyclic aromatic hydrocarbons (PAHs) (fluoranthene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, benzo[ghi]perylene and indeno[1,2,3-cd]pyrene) in wastewater were monitored at different treatment processes in three wastewater treatment plants (WWTPs) by using ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). ...


    By IWA Publishing

  • Cold weather ammonia reduction in municipal/industrial treatment plant case study

    Problem During cold weather this municipal wastewater treatment plant with a high percentage of industrial flow from food processing and electronics manufacturing suffered from high ammonia loadings. As temperatures dropped the plant lost nitrification. The objective of this full-scale product application program was to reestablish ammonia oxidation and reduce ammonia-nitrogen in the lagoon ...


    By Bioscience, Inc.

  • Skyharvester UNUM Insurance case study

    Objective: To reduce municipal water usage at UNUM’s new Corporate Headquarters site in Chattanooga, TN. Site Specifications & Known Requirements: Harvested water usage to be 100% irrigation. Urban location Average gallons of water needed per week: 7,950 Maximum gallons of water needed during peak summer weeks: ...


    By Lindsay Corporation

  • Comparison of vertical and horizontal flow planted and unplanted subsurface flow wetlands treating municipal wastewater

    In the search for design criteria for constructed wetlands (CWs) in Nepal a semi-scale experimental setup including horizontal flow (HF) and vertical flow (VF) CWs was developed. This paper compares the performance of HF and VF wetlands, and planted with unplanted beds. The experimental setup consists of two units of HF and VF beds of size 6 m × 2 m × 0.6 m and 6 m × 2 m ...


    By IWA Publishing

  • N2O emission from full-scale urban wastewater treatment plants: a comparison between A2O and SBR

    The emission of nitrous oxide (N2O) from full-scale anoxic/anaerobic/oxic (A2O) and sequencing batch reactor (SBR) processes was measured to evaluate N2O emission from urban wastewater treatment plants (WWTPs). The results showed that N2O flux in the A2O WWTP followed an order of A2O-oxic zone > aerated grit tank >> ...


    By IWA Publishing

  • Case study - Warehouse in Peterborough

    Case History fitting Graf Carat at Warehouse A GRAF Carat 2700 litre tank was installed next to the new extension to store all the water off the new roof and a part of the existing roof. Excess water goes to soak-away as normal. The rainwater is pumped by a submersible pump through a Rain Director control pane. The Site Big Web Warehouse Ltd., a sister company to Rainwater ...

  • Sedimentation structures

    Sedimentation structures are measures, which purify the surface runoff with the principle of sedimentation. The separation of solid from rainwater discharge (divided sewer system) can be carried out through: grit chamber rainwater sedimentation tank vortex separator system The dimensioning of plants, that work with sedimentation is done according to the allowed ...


    By IWA Publishing

  • Project profile - Westview Elementary and High Schools Topeka, Indiana arsenic treatment systems

    Background In early 2006, AdEdge Technologies Inc. (AdEdge) teamed up with Hawkins Water Tech to design and implement two full-scale arsenic treatment projects for Westview Elementary School and Westview High School located in Topeka, Indiana. Arsenic concentrations in the school wells range between 21 and 23 ppb, which exceeded the new Federal EPA standard of 10 ppb. Design plans were ...

  • Pollutant release from a disturbed urban snowpack in northern Sweden

    Water and pollutant release from a disturbed urban snowpack was studied in an experimental plot encompassing a road section and the adjacent grassed boulevard in the city of Luleå, in northern Sweden. Winter road maintenance in this area includes snow ploughing and applications of grit without any road salts. During the study period, 18 snowmelt events were observed. Compared to rural areas and ...


    By IWA Publishing

  • Performance of UASB based sewage treatment plant in India: polishing by diffusers an alternative

    In India, recently, upflow anaerobic sludge blanket (UASB) based sewage treatment plants (STPs) have come up in a big way. Sequence adopted: screens- grit chambers- UASB reactors followed by one-day detention ponds (DP). Performance of DPs located at five STPs (27–70 ML/d) was evaluated over a period of one year from July 2004 to July 2005. The installation of these non-algal ponds reduced land ...


    By IWA Publishing

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