Hazen and Sawyer Wins Hillsborough Treatment Plant Work

Design Services for Expansion and Upgrade of Existing Plant

(RALEIGH, NC – March 9, 2009) – The City of Hillsborough, North Carolina, recently awarded Hazen and Sawyer a contract to provide engineering design services for the expansion and upgrade of its wastewater treatment plant. The City is a new client for Hazen and Sawyer, and proposals from more than ten firms were received for this work.

The primary goals of the project are to expand the Hillsborough Wastewater Treatment Plant (HWWTP) to a capacity of 3.2 million gallons per day (mgd) and to upgrade its existing nutrient removal process. The plant is presently a 2-stage mechanically aerated facility. Improvements to all unit processes including influent pumping, grit removal, filtration, disinfection and solids treatment are planned. The City has decided to upgrade the nutrient removal process in anticipation of future development in the area and the tightening of discharge limitations.

As part of this project Hazen and Sawyer will also explore options to maximize the sustainability of the materials used and the energy efficiency of HWWTP’s expanded and upgraded operations. Specifically, the City has expressed interest in the incorporation of solar power and peak load shaving into the project. Peak load shaving is an arrangement in which a facility agrees to use standby power – such as a generator – at the periodic request of the local electrical utility so as to lower the strain on the electrical grid. In this arrangement, the HWWTP will install a generator capable of powering the facility for a defined duration of time, in exchange for a lower unit cost for electricity from their local electrical utility, Duke Power.

The discharge from the Hillsborough Treatment Plant enters the Eno River. Total nitrogen and phosphorus loads to the Eno River will be reduced significantly as a result of the improvements implemented by the design project.

For more than half a century, Hazen and Sawyer has focused on two things: providing safe drinking water and controlling water pollution. Our range of services encompasses the planning, design, and construction management of water and wastewater-related projects – from clean water treatment, storage, and distribution to wastewater collection and treatment. Since our founding in 1951, we have grown in size to over 740 employees in 25 offices.

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