Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Session Overview
Session 12A: Operations and Maintenance: Odor Control
Tuesday, 10/Sep/2019:
8:00am - 9:30am

Session Chair: Susan Schlangen, Water Systems Consulting;
Location: D137-138

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8:00am - 8:45am

Clearing the Air: King County Wastewater Treatment Division's Odor Control Solutions in Two Seattle Neighborhoods

David Kopchynski3, Mark Slepski2, Felix Brändli1, Ray Nickel2

1Parametrix, United States of America; 2King County Wastewater Treatment Division; 3Water Works Engineers;

There is a complex history of odor issues associated with the King County Wastewater Treatment Division (WTD) Elliott Bay Interceptor (EBI) and associated Trunk Sewers that serve the Seattle metro area. These issues vary with precipitation amounts, ambient temperature, and sewer flow conditions. This presentation will examine how WTD tackled specific odor challenges in its sewer system located within the Alki Beach and Interbay neighborhoods of Seattle, WA.

This presentation will specifically cover the following:

  • How the engineering and community relations teams responded to odor complaints from residents in the Alki Beach neighborhood and provided short and long-term odor control solutions.
  • The stepped implementation approach that was used to control odor releases from the WTD sewer system located in the Alki Beach neighborhood.
  • The proactive approach used to plan odor control for the EBI’s Interbay Pump Station Forcemain Discharge Structure, as commercial development moves closer to the structure’s footprint.
  • How the team used the County’s Lean process improvement methodology to more rapidly develop alternatives and to select preferred alternative technologies and implementation strategies for the control of odors and corrosion. The alternative analysis included an overview of employing dry media carbon vs. bioscrubbers for Interbay.
  • An overview of how dry media carbon filters can be optimized to improve treatment performance for removal of hydrogen sulfide and other sewer odors such as reduced sulfur compounds such as mercaptans and dimethyl sulfide.
  • Coordination with the public on odor control solutions.

8:45am - 9:30am

The Cost of Being a Good Neighbor

Sharon Paterson1, Scott Cowden2, Dennis Froehlich3

1Anue Water Technologies, United States of America; 2Jacobs Inc.; 3Pima County, Arizona;

Is there a "rule of thumb" for what a top odor performing utility spends to keep odors under control? How do you measure your utility's performance as a good neighbor? This presentation examines practices and expenditures of five of the top performing utilities in the country who are recognized as good neighbors in their communities. We will talk about how the approaches of the best city programs differ from the rest of the pack. We will also break down the capital spending and operating and maintenance costs of odor prevention and mitigation, as well as how these utilities staff their departments for responding to public observations on odor.

Like fingerprints, no two treatment plants are alike. What works for one treatment plant might not work for everyone. There are differences in flow, population served, climate/temperature, age and condition of infrastructure, characterization of the influent, offsite odor goals, and many other factors. But there are practices and decisions that are common among the best performing utilities in how they minimize their off-site impact. This study examines the approach of capital investment and ongoing operations to reduce odor impact.

Consequences of offsite odor goal selection have a direct impact on capital costs (CAPEX) and annual operations and maintenance (O&M) costs (OPEX) related to implementation of an odor program. More stringent odor standards result in higher present-worth costs because more stringent standards typically require larger, more expensive odor control systems that consume greater amounts of labor and energy and other consumables (e.g., chemicals, media, etc.). This presentation examines these costs in detail.

Co-authors include an experienced utility manager who has championed odor performance for his County in Arizona, an odor practice leader for a top engineering consulting firm, and a business development professional who has worked with clients on solving odor problems for over ten years. All three have contributed to industry knowledge over the years through WEF and A&WMA committees, conferences and workshops.

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