Water and Wastewater Energy Audits — A Case Study
Tata & Howard, Inc. conducted an energy audit of the City of Flagstaff’s Water System. The purpose of this energy audit was to identify energy conservation opportunities that would provide annual and life cycle power cost savings for the City of 66,600 people. Tata & Howard provided upgrades that would raise efficiency, resulting in significant annual savings. In addition, the upgrades qualified for a rebate through APS, resulting in an average payback of less than three years.
Separation of Water Distribution System into Two Zones, Spencer, MA
In 2007, the Town of Spencer, Massachusetts received an Administration Consent Order (ACO) from the Massachusetts Department of Environmental Protection (MassDEP) mandating changes to their water treatment process, and the separation of the Town’s water distribution system into two pressure zones. This paper discusses the completion of this project in three phases. The System Study evaluated the conceptual design criteria needed for the two pressure zones and selection of tank sites. The Design Phase highlights permitting and design challenges encountered, and the Construction Phase discusses the overall final product, construction challenges and project successes.
Dissolved Air Flotation (DAF) Pilot Study for Algae and DBP Reduction
Originally published in the NEWWA Journal, April 2015
A pilot study of dissolved air flotation clarification (DAF) with mixed media filtration was conducted at the Norwich Public Utilities Stony Brook water treatment plant for the removal of disinfection byproducts (DBP) and algae in the late summer of 2013. A variety of coagulants and flow rates were studied. DAF showed outstanding algae removal in excess of 90 percent with all coagulants. DBP removal varied by coagulant with ferric chloride and high doses of alum achieving the best results.
Application of Ozonation and Ultrafiltration in Drinking Water Treatment Operational Comparison
The Spectacle Pond Water Treatment Facility in Littleton, Massachusetts has been successfully operating for over ten years relying on a combination of ozone oxidation followed by ultrafiltration membranes. This paper compares the operation of the plant in Littleton with more recent installations utilizing ozonation and ultrafiltration membranes at the Mattapoisett River Valley Water Treatment Facility in Mattapoisett, Massachusetts and the Baldwin Pond Water Treatment Facility in Wayland, Massachusetts with regard to similarities as well as changes that have affected the industry.
Advanced Condition Assessment for Pipeline Rehabilitation
In 2007, Tata & Howard began extracting one foot long cast iron water main samples ranging in diameter from six to twelve inches as part of a cleaning and cement lining water main rehabilitation project for the South Central Connecticut Regional Water Authority (SCCRWA). Since then, Tata & Howard has evaluated a significant number of cast iron water main samples for several water distribution systems throughout Massachusetts and Connecticut, typically during a pipeline rehabilitation project, water main failure, or water main replacement project.