Drinking Water Disinfection Resources

  1. A Multi Process Approach With One Single Solution 10/22/2018

    A joint effort between the city of Hollister, the San Benito County Water District and the Sunny slope County Water District, the group proposed the West Hills Water Treatment Plant (WHWTP) project to improve drinking water quality, water supply reliability, and to balance regional water resources in the Hollister Urban Area (HUA). Historically, HUA relied primarily on local groundwater basins for meeting their drinking water demands. While groundwater met all drinking water regulations, it is high in minerals and hardness that often resulted in scaling and the need for further conditioning.

  2. California Dreamin’? Pilot Study Makes Treating Arsenic, Manganese And Iron A Reality (Loprest) 10/12/2018

    A pilot study was conducted for arsenic, manganese, and iron treatment system at a well site. The onsite pilot test demonstrated the performance of the Loprest Water Treatment Company treatment process.

  3. Pilot Test For Manganese Removal Using Manganese Greensand (Loprest) 10/11/2018

    Loprest has been designing and fabricating manganese removal systems using manganese greensand for over forty years. Drawing on that experience; filtration rates, run times, backwash procedures, chemical dosage rates, etc. are all established by theoretical calculations and history. Therefore, Loprest’s goal in this pilot study was to conduct uninterrupted operation per bid testing procedures and document the results.

  4. Is Coagulation Followed By Filtration Viable To Remove Arsenic When Raw Water Arsenic Levels Are High? (Loprest) 10/9/2018

    A pilot study hoped to demonstrate "proof of concept" if coagulation followed by filtration was a viable technology to remove arsenic when raw water arsenic levels are high.

  5. Removing Iron, Arsenic, And Manganese To Meet California Regulations 10/9/2018

    A pilot study was conducted in Sacramento to provide manufacturers an opportunity to demonstrate the effectiveness of water treatment products that employ oxidation and filtration to remove iron, manganese, and arsenic to levels.

  6. Philippines Potable Water System Improvement Project Uses Filter Underdrain Blocks To Improve Backwash Efficiency 10/9/2018

    Founded in 1997, the Manila Water Company (MWC) serves the potable water needs of more than five million residents of the Philippines capital and cities to the east. The company serves as the private partner in a public-private partnership with the Philippines government in operating the Metropolitan Waterworks and Sewerage System for Metro Manila’s East Zone.

  7. A Pilot Study Involving Three Different Treatment Media (Loprest) 10/8/2018

    As part of a feasibility study for arsenic treatment at an elementary school in California, a pilot study was conducted to test the performance of three different treatment media: (1) greensand and anthracite, (2) standard sand and anthracite, and (3) manganese dioxide.

  8. Standardizing On-Site Hypochlorite Generation Disinfection Technology In Water And Wastewater Treatment Plants Increases Safety And Eases Operations 10/3/2018

    In late 2005, the City of Newberg, Oregon, decided to upgrade their water treatment plant disinfection process from gas chlorine to on-site hypochlorite generation (OSHG) in an effort to simplify operations and increase operator safety. The plant produced an average of 2.5 million gallons per day (MGD), with a peak capacity of 5 MGD.

  9. Arsenic Removal Pilot Study Meets California Standards (Loprest) 10/3/2018

    Well water from several locations in Ridgecrest, California area is high in arsenic, carbonates and pH. Due to the high levels of arsenic, some wells are not being used to supply municipal water to the city of Ridgecrest and were shutdown. Due to local demand, the feasibility of treating these wells to remove most of the arsenic before blending with water from other wells is being investigated.

  10. Four Day Pilot Study For Iron And Manganese Does The Trick (Loprest) 10/2/2018

    The City of Southgate, California wanted to investigate the effect of replacing the existing media in their Well 27 treatment plant. The plant would not reduce the incoming manganese levels to below the 50 μg/l MCL. It has been theorized that the existing media has become fouled beyond cleaning during the one year plus of non-operation while contained in the filter tank full of water. That environment could produce a likely source of biological and other sources of fouling.