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Your search for “corrosion” returned 39 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…

  • 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…

  • 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.

  • 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…

  • Hazen and Sawyer Recognized with Platinum Award in 2009 Engineering Excellence Awards Competition

    Mar 16, 2009  |  News

    The New York City Stage 2 Disinfectant/Disinfection Rule Compliance Study won the Platinum Award in the American Council of Engineering Companies (NY), the second highest honor in the 2009 Engineering Excellence Awards program.

  • 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…

  • 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…

  • 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…

  • 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…

  • Washington Suburban Sanitary Commission to Upgrade Potomac WFP

    Oct 05, 2009  |  News

    Hazen and Sawyer was selected to analyze the impacts of coagulation with ferric chloride on existing processes at the 285-mgd Potomac Water Filtration Plant (WFP) and to develop biddable design documents for new ferric chloride and caustic chemical storage and feed facilities at that facility.

  • 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…

  • 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…

  • 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…

  • 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…

  • 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.

  • 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…

  • 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

  • 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,…