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Your search for “corrosion” returned 39 results.

  • Diagnosis of Unusual Color in Groundwater and Alternatives for Treatment

    Nov 07, 2017  |  Publications

    …can be associated with corrosion in the metal pipes and fittings made of copper and copper alloy components, or in groundwater from erosion of natural deposits. The results of this sampling indicated copper below detection limit in all samples. In the absence of any indicative of the green color source…

  • 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…

  • Best Practices for Chemical Facility Design in Water Treatment

    Oct 23, 2017  |  Publications

    …pre-oxidants to distribution system corrosion inhibitors, chemicals are prevalent throughout the whole treatment train. If designed properly and maintained effectively, chemical systems provide safety for plant staff and stability to the treatment process and distribution system. However, an inadequate chemical system and insufficient maintenance could result in a chemical spill,…

  • 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,…

  • 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.

  • Blending in Potable Reuse - Challenges of and Solutions to Meeting Multiple Water Quality Objectives

    May 30, 2017  |  Publications

    …quality, disinfection byproduct formation, corrosion control, and aesthetic concerns. The relationship between DPR and each of these factors will be discussed, as well as recommended pilot testing/planning evaluations and water quality monitoring for pre- and post-implementation of DPR blending to address these factors. Overall, this presentation aims to inform site-specific…

  • Tap Sampling Procedures to Characterize Lead Changes Following Lead Service Line Replacement

    May 30, 2017  |  Publications

    …deposits of lead in corrosion scales of interior premise plumbing. Based on reports in the literature, physical disturbance of these existing corrosion scales during full LSLR can cause a short-term increase in lead release, primarily in the form of particulate lead. Thus, a re-stabilization period of up to 3 months…

  • Proven Benefits of WASSTRIP and OSTARA Technologies in the US - from Design Through Start Up

    Apr 03, 2017  |  Publications

    …system for odor and corrosion control. High concentrations of soluble magnesium are found in the primary sludge due to the mag addition and therefore Mg does not need to be added to the Ostara process. The WASSTRIP tank is achieving good P-release with a HRT of 5 hours. No impact…

  • “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.…

  • 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…

  • 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.

  • Successful Risk-Based Phased Approach Helps REWA Prioritize and Plan Force Main Assessment

    Mar 16, 2016  |  Publications

    …location under busy roads, corrosion risk, etc. The combination of the CoF and PoF is called the “risk score”. We used a combination of GIS and in-house risk software to automatically generate risk scores for each 500’ segment of force main (FM) and rank each FM segment and individual components…

  • Getting Smarter About Your Force Mains - What You Don’t Know Could Scare You

    Feb 09, 2016  |  Publications

    …in internal hydrogen sulfide corrosion of pipe surface. PWA technology collects data by measuring changes in the self-generated magnetic field produced by ferromagnetic materials in stress. SmartBall PWA is a detailed screening technology used for assessing the condition of metallic pipelines by identifying pipe sections (joint-to-joint) which exhibit increased levels…

  • Richard J. Pope Named Vice President

    Jan 12, 2015  |  News

    (NEW YORK, NY) – Hazen and Sawyer announced today the appointment of Richard J. Pope as Vice President.

  • TDS Impacts on Wastewater Treatment and NPDES Permit Compliance

    Aug 18, 2014  |  Publications

    …treatment, an evaluation of structural/corrosion concerns, aeration, nitrification, sludge settling, solids precipitation, biosolids disposal, UV disinfection, metals, and whole effluent toxicity (WET) are critical factors that must be considered prior to accepting a high-strength TDS industry. The WET evaluation requires a series of increasing strength TDS dilutions and then assessing…

  • 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.

  • Trenchless Construction in an International Access Channel

    Apr 11, 2014  |  Publications

    …cost, high susceptibility to corrosion in a salt water environment, and additional QA/QC time required for analyzing and testing of welded joints. After careful consideration, DR11 HDPE with PE 4710 resin was selected as the pipe material due to its inherent ability to withstand higher tension loads and greater service…

  • Past and Present Membrane Plant Operation Assistance in South Florida

    Jan 20, 2014  |  Publications

    …data normalization implementation, troubleshooting, corrosion inhibitor pilot testing and membrane cleaning assistance among others have been important to help with membrane treatment plant challenges. The City of Plantation currently operates the Central and East Membrane Treatment Facilities. Recently, H&S has provided assistance at the 12.0 mgd East Membrane Plant for…

  • Increasing Reuse Supplies by Blending Nano-Concentrate with Treated Effluent

    Jan 16, 2014  |  Publications

    …of protection to address corrosion issues. In either instance, the net result was loss of a valuable resource. The Loxahatchee River District (LRD), which was one of the first reuse facilities in the State of Florida, needed additional irrigation quality water to meet ever increasing reuse demands. The LRD reuse…

  • Ocean Desalination Water Quality Integration Study at West Basin

    Jan 16, 2014  |  Publications

    …of different water qualities. Corrosion Analysis Unlined cast iron pipe was evaluated for release of iron and manganese; cement mortar-lined pipe was evaluated for leaching of aluminum indicative of corrosion; and copper pipe and brass meters were analyzed for metals release including lead, copper, and zinc. Pipe loops were operated…