Evaluating Johnston County’s Energy Consumption at Water and Wastewater Treatment Plants

Project to Yield Substantial Power and Operational Costs Savings

Central Johnston County WWTP

Aeration Blowers

Finished Water Pumps

Johnston County Water Transmission Master Plan

(Raleigh, NC – July 19, 2010) – Johnston County has retained Hazen and Sawyer for engineering services related to their Energy Efficiency and Conservation Block Grant project.

This project will reduce Johnston County’s energy consumption at their existing drinking water and wastewater treatment and transmission facilities through a wide range of energy efficiency improvements including wastewater aeration efficiency improvements by implementing dissolved oxygen control strategies for the biological treatment system at the Johnston County WWTP, control strategy modifications at the filter influent pump station and denitrification filters, and variable frequency drives, power monitoring and stand-by power generation capabilities at various locations in both the water treatment and wastewater treatment facilities and conveyance systems.

This project is expected to result in significant power and operational cost savings for the County and will fully leverage Hazen and Sawyer’s previous experience in related engineering for the County including:

  • Design for the last two major expansion projects to the Johnston County WWTP (in 2003 and 2006).
  • Design of the innovative Johnston County WTP MIEX™ project.
  • Completion of a Master Plan and system wide hydraulic model for the drinking water distribution system throughout Johnston County.

Since our founding in 1951, 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 and stormwater collection, treatment, and reuse.

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