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Your search for “corrosion” returned 43 results.

  • Drinking Water Process Studies

    Apr 15, 2013  |  Services

    …of treatment issues, including corrosion control. We have worked for some of the largest utilities in the country, as well as for many smaller utilities. Our scientists and engineers include top researchers whose work identifies innovative treatment methods, operational tools, and water quality modeling techniques, bolstering the expertise and big-picture…

  • Buffalo Water Quality Initiative

    Nov 17, 2017  |  Projects

    …replacementCollaboration with local and national academic partners for a corrosion control pipe loop study and laboratory analysis of pipe scales

  • Fast-Track Design for Regulatory Compliance at the 285-MGD Potomac WFP

    May 10, 2010  |  Projects

    …bench-scale testing results of corrosion potential on differing pipe materials, particularly when switching from PACl to ferric chloride (and back again) * Evaluating alternative pH and alkalinity adjustment chemicals and developing associated design concept * Developing final (biddable) design documents for the construction of the required chemical feed improvements The…

  • Replacing Older Technology: Ft Lauderdale Membrane Treatment Facility

    Nov 19, 2009  |  Projects

    …carbon dioxide, pH adjustment, corrosion inhibitor addition and chloramines disinfection. Transfer pumping, high service pumping and 8 MG of finished water storage are also provided. We endeavored to preserve the historical existing structures by designing the additions for the new treatment facilities to be architecturally compatible with the Mediterranean Revival…

  • Disinfection By-Products Study for New York City Water System

    Dec 08, 2009  |  Projects

    …on lead and copper corrosion * Evaluation of the potential to form nitrogenated disinfectant byproducts * Evaluation of operational, environmental and security concerns surrounding a disinfectant change Results The DBP prediction model was used to predict THM and HAA levels throughout the New York City distribution system under a variety…

  • Assessment and Improvement of Water/Wastewater Systems in Peru

    Feb 15, 2011  |  Projects

    …43,000 service connections. Advanced corrosion, as well as structural deterioration and failure, are widespread among the wastewater mains and manholes. Many areas of the system are also subject to surcharges, overflows, and settlement that undermine the overlying roadways. Hazen and Sawyer’s role is focused primarily on the condition assessment of…

  • Corrosion Control Study at Fayetteville’s P.O. Hoffer WTF

    Sep 27, 2010  |  Publications

    …zinc orthophosphate as the corrosion inhibitor chemical. The change in primary coagulant represents a significant change in finished water quality, and the NC DENR PWSS requires that a corrosion control study be conducted to optimize corrosion control under the new conditions. Fayetteville PWC authorized Hazen and Sawyer to conduct a…

  • Long Term Strategies for Charlotte Water’s Corrosion Control Optimization

    Oct 18, 2016  |  Publications

    …to above 8.0 for corrosion control. Although a high finished water pH reduces the solubility of lead, it also favors production of THMs as well as reducing the disinfection efficiency of free chlorine. A corrosion control pilot study was performed to assess if a lower finished water pH, in conjunction…

  • Predicting Hydrogen Sulfide Corrosion “Hotspot” in Large Sewer Collection System

    Mar 13, 2018  |  Publications

    …expended to delineate the corrosion problem in the system and the model was subsequently calibrated/verified. Therefore, proper remedy can be implemented at precise location to prevent the structural degradation of those concrete pipes. This paper will revisit the chemical and bacteriological reaction that led to the corrosion problem by H2S,…

  • Corrosion Control and the Impact that Coagulants Have – Balancing DBP, Lead, Copper Compliance

    Aug 09, 2017  |  Publications

    …the pipe material against corrosion by water. These scales have been influenced by historical water quality and treatment changes and any disruption to these scales can leave the piping material prone to corrosion including lead and copper. While there are many interrelated factors impacting the rate and type of corrosion,…

  • Controlling Corrosion and Preserving Water Quality

    Aug 05, 2010  |  Publications

    …an increase in lead corrosion in some drinking water systems. Hazen and Sawyer has taken a practical approach to evaluating the corrosive effects of finished water quality changes, performing targeted testing from desktop/benchscale to flow-through pilot loop and full-scale studies to help utilities make educated decisions with regard to treatment…

  • 2018 NC AWWA-WEA Presentations

    Mar 13, 2018  |  News

    (RALEIGH, NC) – Hazen and Sawyer staff will present five papers at the upcoming NC AWWA-WEA conference, to be held March 26-27 2018 in Asheville (NC).

  • Practical Evaluation of Corrosion Before Water Quality Changes

    Nov 17, 2009  |  Publications

    …an increase in lead corrosion in some drinking water systems. Recent studies investigating lead corrosion problems experienced by water utilities after modifying their treatment process are still somewhat speculative despite hindsight into the possible causes. Part of the problem is that wholesale changes to a variety of water quality parameters…

  • New Paper on Lead and Copper Corrosion in Water Distribution Systems

    May 14, 2014  |  News

    (RALEIGH, NC) – Michael Wang and Weidong Zhang are co-authors of a new paper recently published in Journal of Environmental Engineering.

  • “Vortexing” Away Hydrogen Sulfide – Reducing H2S Concentrations

    Feb 21, 2017  |  Publications

    …extent of odors and corrosion potential within a portion of the JMWSC’s collection system. This project was divided into two phases with the first phase evaluating the wastewater and providing recommendations. The second phase was the implementation of the recommendations to achieve acceptable levels of hydrogen sulfide within the system.…

  • Reducing Lead Levels in Drinking Water

    Nov 01, 2017  |  Publications

    …actions associated with optimal corrosion control treatment, lead service line replacement, public education, and localized household-level responses (USEPA and NDWAC, 2016). Action Levels and Sampling Requirements The current Lead and Copper Rule lead action limit (AL) of 15 μg/L, which serves as a benchmark for effective corrosion control treatment, is…

  • Drinking Water Research and Innovation

    Mar 08, 2011  |  About

    …our water supply, controlling corrosion and disinfection by-products in a distribution system, making the most efficient use of membranes, or assessing and managing the risks of climate change and extreme weather events, Hazen and Sawyer’s leading experts are working with top research foundations and some of the world’s largest utilities…

  • 2017 Tri-Association Conference Presentations

    Aug 09, 2017  |  News

    (BALTIMORE, MD) – Hazen and Sawyer staff will conduct 10 presentations at the 2017 Tri-Association Conference.

  • 2016 NC AWWA-WEA Annual Conference

    Oct 18, 2016  |  News

    (RALEIGH, NC) – Hazen and Sawyer staff will conduct 15 presentations at the 96th NC AWWA-WEA Annual Conference, to be held November 13-16, 2016.

  • Selection of Collection System Odor Control Technologies: Bench- and Full-Scale Testing

    Feb 28, 2018  |  Publications

    …sulfides also lead to corrosion of system infrastructure. Control of these compounds in collection systems is important to minimize public complaints and corrosion issues. Currently, Charlotte Water minimizes hydrogen sulfide in the collection system by adding a calcium nitrate solution to the wetwells at eight pump stations where odor complaints…