Dry Creek WWTP Odor Control Improvements

Client: Sanitation District No. 1 of Northern Kentucky
Location: Villa Hills, KY

Since 2004, Hazen and Sawyer has been involved and committed to nearly every major project at the Dry Creek Wastewater Treatment Plant owned and operated by the Sanitation District No. 1 of Northern Kentucky. This facility has been in operation since 1979 and treats an average of approximately 25 million gallons per day of industrial, commercial and residential wastewater. Dry Creek WWTP is located in a valley with several residential neighborhoods on the surrounding hillsides, making it a particularly sensitive site for odor. As a part of our long-term relationship and work with SD1 at Dry Creek, Hazen has provided a number of proactive and key services to evaluate existing odor sources and control systems at the facility, design new odor control systems for the plant, and help reduce off-site odor impacts.

An aerial of Dry Creek WWTP.

The new headworks facility provides 100 mgd of firm screening and grit capacity.

Biological odor control beds at the new headworks facility.

Wet chemical scrubber system was implemented to treat foul air from raw sludge storage tanks and centrifuge vents.

Project Outcomes and Benefits

  • We conducted a comprehensive evaluation of the odor control system, including air sampling for dilution-to-threshold and reduced sulfur compounds, dispersion modeling, assessment of condition and performance of odor control equipment, operating and maintenance deficiencies, and recommendations for long-term phased improvements for odor control on their solids processing and storage facilities including cost evaluation for various chemical and biological alternatives.
  • Design of new dewatering systems and a new solids loadout facility included a new multi-stage, 6,500 cfm, wet chemical scrubber system to treat foul air from raw sludge storage tanks and centrifuge vents. These sources were identified as those requiring the highest degree of control to prevent off-site migration from the solids treatment process.
  • As a part of design of a new headwork facility that provides an additional 100 mgd of firm screening and grit capacity, we designed new biological odor control beds. The built-in-place, mulch bed biofilter type odor control system treats 12,000 cfm of foul air from the influent channels and screenings storage area.
  • SD1 was given the opportunity to apply for a FAWRF loan through the Kentucky Infrastructure Authority for some of this work. The funding was only available over a limited time frame and accelerated the schedule for design and construction of the odor related projects. Hazen and Sawyer was able to deliver the design and construction services within the accelerated schedule.

For more information on this project, or to discuss a similar project in your area, contact Steven Reese at sreese@hazenandsawyer.com