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Your search for “corrosion” returned 43 results.

  • 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…

  • 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…

  • 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…

  • 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…

  • 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…

  • 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…

  • 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,…

  • 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

  • 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.

  • 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…

  • 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…

  • 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…

  • 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…

  • 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.

  • 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…

  • 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…

  • 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.

  • 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…