Odor Control

Two new 5-mgd degasifiers for RO post-treatment address taste and odor control concerns at the South Collier Reverse Osmosis Desalination facility.

For the Henrico County WRF, we designed three different odor controls facilities - for the preliminary treatment and primary clarifiers, for the solids handling facilities, and for the anaerobic and anoxic zones of the biological nutrient tanks.

The odor control system at the Paerdegat Basin CSO Control Facility consists of five exhaust air trains, each containing motorized inlet and outlet damper, activated carbon vessel and variable speed fan.

Two major areas of odor concern were identified and addressed through the planning and design stages of our dual-distribution wastewater reuse project for the City of Miramar (FL).

For the Peekskill WWTP, our design included odor control of the plant’s headworks, including influent channels, screens, and grit tanks, and one new truck bay to contain odors that emanate from sludge transfer operations, along with a system to treat the odors.

We performed a first phase odor characterization study which included an identification of potential sources, sampling, emission rate determination, modeling, and prioritization of sources for the Neuse River WWTP.

Our design for the City of Hallandale Beach Membrane Softening Facility included post-treatment degasification and odor control.

Hazen and Sawyer is a leader in the design of odor control facilities for sludge and wastewater treatment projects, having been responsible for state-of-the-art odor control systems installed around the world.

Our process specialists routinely advise clients on process modifications with the aim of achieving better odor control; improved effluent quality; increased efficiency in power, labor, or chemical usage; and enhanced sludge handling. Experience has taught us that there are three general approaches to developing an odor control program: elimination of the odor source, elimination of the odor perception, and treatment of the odor.

While the sources of wastewater treatment plant odors cannot be completely eliminated, they can be minimized through good housekeeping, proper facilities design and operation, and control of discharges. Elimination of the odor perception refers to the dilution of odors with fresh air, or masking the odor by superimposing a more pleasant aroma. The efficacy of masking is often uncertain with respect to public acceptance, and the process tends to be high in chemical cost. Treatment of the odor at its source is usually the necessary approach for odor control at wastewater treatment plants. This can be achieved through technologies such as carbon adsorption and wet scrubbers to treat off gases, and the installation of covers on tanks and chambers that process wastewater, to contain odors and prevent their dispersion.

For inquiries contact:
Richard Pope, P.E., at rpope@hazenandsawyer.com