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Your search for “corrosion” returned 43 results.

  • 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…

  • 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…

  • Nutrient Recovery From WAS Streams for Struvite Control and Recycle Load Reduction

    Apr 09, 2013  |  Publications

    …system for odor and corrosion control. With the addition of Mag in the collection system, struvite precipitation in the solids handling process has become a major issue at the FWHWRC. However, the digesters at the FWHWRC are now phosphorus limited with respect to struvite formation due to the Mag addition…

  • Ion Exchange and Disposal Issues Associated with the Brine Waste Stream

    Apr 09, 2013  |  Publications

    …the water and control corrosion will also be provided. The ion exchange regenerant waste will be captured and stored in tanks on-site and slowly pumped under control to the wastewater collection system to meet local groundwater quality standards. This was determined to be the most cost effective treatment option for…

  • Ion Exchange and Disposal Issues Associated with the Brine Waste Stream

    Apr 09, 2013  |  Publications

    …the water and control corrosion will also be provided. The ion exchange regenerant waste will be captured and stored in tanks on-site and slowly pumped under control to the wastewater collection system to meet local groundwater quality standards. This was determined to be the most cost effective treatment option for…

  • Ion Exchange and Disposal Issues Associated with the Brine Waste Stream

    Apr 09, 2013  |  Publications

    …the water and control corrosion will also be provided. The ion exchange regenerant waste will be captured and stored in tanks on-site and slowly pumped under control to the wastewater collection system to meet local groundwater quality standards. This was determined to be the most cost effective treatment option for…

  • Innovative Approach for Evaluating Stage 2 DBP Rule Compliance Strategies

    Dec 01, 2011  |  Publications

    …and maintenance • Impact on finished water quality and corrosion control • Ease of construction • Regulatory acceptance • Implementation schedule with respect to Stage 2 DBP compliance schedule • Consideration of future regulations for nitrosamines, emerging contaminants, etc. • Lifecycle costs

  • 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…

  • 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…

  • Process Study and Ferric Sulfate Conversion to Comply with the Stage 2 D/DBP Rule

    Sep 27, 2010  |  Publications

    …both plants due to corrosion concerns (chloride/sulfate ratio) with ferric chloride. The two plants made the full-scale conversion to ferric sulfate during the summer 2008. Hazen and Sawyer staff were present to assist plant staff during the conversion process. Both plants have performed very well since the conversion, producing high…

  • Upper Potomac River Commission Wins Dam Safety Award

    Aug 09, 2010  |  News

    (RALEIGH, NC) – Hazen and Sawyer and the Upper Potomac River Commission have been awarded the 2010 Association of State Dam Safety Official’s Northeast Regional Award of Merit for development and execution of a successful plan to replace the four gates that control releases from the Savage River Reservoir.

  • 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…

  • 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…

  • Rivanna Water and Sewer Authority (VA) Upgrading System

    Apr 16, 2010  |  News

    (CHARLOTTESVILLE, VA – April 16, 2010) – Rivanna Water and Sewer Authority (RWSA) has selected Hazen and Sawyer to review, analyze and recommend improvements to the Urban, Crozet, and Scottsville Water Treatment Plants and associated distribution systems to fully comply with the requirements of the Stage 2 Disinfectants and Disinfection…

  • 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…

  • 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…