Contaminant Removal Case Studies and White Papers

  1. Iron, and Manganese Arsenic Pilot Study In The Golden State
    10/1/2018

    This report summarizes results and conclusions of a groundwater treatment pilot test program. This pilot test program was undertaken to demonstrate the effectiveness of water treatment products that employ oxidation and filtration to remove iron, manganese and arsenic to levels well below MCL’s. Operating data collected during the study will be used to confirm the design of fullscale facilities.

  2. Upgrading From Gas Chlorine To On-Site Hypochlorite Generation To Improve Safety And System Resilience
    9/20/2018

    By replacing gas chlorine with on-site hypochlorite generation, Nashville was able to improve the safety and longevity of its water plants to accommodate the growth of the “Heart of Country Music” far into the future. At a recent water conference, Glen Doss, Treatment Plant Manager stated, “In 2016, the last gas chlorine railcar left to large applause.” 

  3. Removing Hexavalent Chromium From Groundwater Supplies
    8/14/2018

    The chromium removal pilot study was conducted for the County of San Bernardino, CA at their CSA 70 Zone J - Well 5 treatment facility. Chromium in the CSA 70 Zone J – Well 5 raw water source exceeds the current Maximum Contaminant Levels (MCL).

  4. Automated Residual Control Maintains Tank Chloramine Residual Levels And Eliminates Nitrite Issues In 3 Million Gallon Tank
    6/1/2017

    Loudoun Water in Northern Virginia has a history of embracing change and seizing opportunities to create a more robust and sustainable water system. Situated in the fast-growing suburbs of Washington DC, Loudoun Water provides chloraminated drinking water to over 65,000 households through a network of over 1,200 miles of pipes and 7 tanks. A key element of Loudoun Water’s mission to sustainably manage water resources has been their efforts to improve the operational efficiency of their drinking water system. For a chloraminated water system, that means getting control of nitrification.

  5. Monoclor Chloramine Residual Management System Manages Residual For Problematic 5.5 Million Gallon Tank
    7/10/2018

    Eastern Municipal Water District (EMWD) serves about 142,000 customers in Riverside County, CA. The EMWD service area is one of the largest for any water district in arid southern California. On the drinking water side, EMWD manages two water treatment plants and over 15 reservoirs. With 70% of the district’s water coming from the Metropolitan Water District with chloramine disinfection, EMWD has become reliant on chloramine disinfection to manage long transmission lines and longer detention times.

  6. Ozone Resolves Hydrogen Sulfide And Color Issues In Well Water
    9/1/2018

    A potable water plant in Eastern Angelina County, Texas,  serves over 2,000 rural customers.

  7. Pilot Test For Manganese Removal Using Manganese Greensand
    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.

  8. Upgrading DWTP Operations In Kansas With The QbD1200 TOC Analyzer
    7/26/2017

    For drinking water treatment plants (DWTPs), the EPA’s Disinfection Byproduct Rule (DBP) is a way of life. Unfortunately, for many facilities the equipment and operations haven’t evolved with the regulation mandates, leaving facilities in a tough spot. For a DWTP in Douglas County, KS, its challenges with accurate TOC measurement and testing, along with expensive calibrations and extended downtime with its prior TOC analyzer led it to trialing the Hach QbD1200 TOC Analyzer. Read the full case study to learn more.

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

    The City of Paramount conducted a pilot study for arsenic, manganese and iron treatment system at their Well 15 site. The onsite pilot test was designed to demonstrate the performance of the Loprest Water Treatment Company treatment process proposed for the new treatment plant.

  10. City Of Austin, Texas Installs A Total of 4,500 Pounds‐Per‐Day Of On‐ Site Hypochlorite Capacity Using the Microclor® OSHG System
    7/24/2018

    With 100 years of service history, Austin Water has seen enormous change in its 540 square miles of service area. Planning for the next 100 years has city and utility planners considering a diversity of sources, system resilience, and sustainability while being mindful of conservation goals. In the city’s newest water treatment plant, WTP4, Austin Water was able to combine those planning elements into a state‐of‐the‐art treatment plant. The plant, which is located on Lake Travis, is capable of treating 50 million gallons a day (MGD) with the ability to expand to 300 MGD.