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 02B: Wastewater 101: Odor and HVAC
Monday, 09/Sep/2019:
1:15pm - 2:45pm

Session Chair: Ray Nickel, Parametrix;
Location: D135

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1:15pm - 2:00pm

Bridging the Gap Between HVAC and Wastewater Treatment Plant Design

Randy Mueller, Neal Forester

Jacobs, United States of America;

The evolution of the wastewater treatment plant has come with the need for more complex HVAC systems to help maintain safe working conditions, protect the plant’s assets, support odor control systems and provide a comfortable and healthy working environment. Specifically, a well-designed HVAC system can minimize explosion and fire hazards, extend the service life of equipment by preventing outdoor contaminants such as dirt, dust, corrosive gases and other debris from entering buildings, provide the required make-up air for odor control systems and provide a favorable environment for operators using energy efficient HVAC technologies. Additionally, today’s wastewater treatment plants are viewed as valuable renewable resources and a well-design HVAC system is the key to recovering many of those resources such as waste heat from electrical rooms and biogas from anaerobic digestion. However, integrating a well-designed HVAC system into today’s wastewater treatment plants can be challenging. First, firms that design wastewater treatment plants may not have the capacity to take on the HVAC scope and will typically subcontract the work to an MEP firm that may lack experience designing for the harsh and corrosive conditions typically present at a wastewater treatment plant. Second, most codes and standards that provide guidance for HVAC design focus on commercial buildings and don’t specifically address wastewater treatment plants. The design professional is often forced into making inferences on how the code or standard applies to a wastewater treatment plant. Finally, open your most trusted wastewater treatment reference book and you will likely find minimal (if any) information on the design of HVAC systems. For all these reasons, an opportunity exists for the both the HVAC design professional and the wastewater engineer to bridge the gap between these two exciting fields.

2:00pm - 2:45pm

Odor Control Performance Comparison Between Composting Technologies

Todd Williams

Jacobs, United States of America;

Historically, one of the major impediments to successful biosolids composting facilities has been the lack of understanding and properly designing and operating facilities to prevent offsite odor problems. This one issue has resulted in the closure of dozens of composting facilities that were otherwise successful. In the past decade, great strides have been made in the design of compost systems that can successfully contain and treat composting odors such that offsite odor problems are eliminated and facilities can be good neighbors.

Two popular composting technologies, the membrane covered aerated static pile process and the conventional aerated static pile process with biofiltration continue to be developed, each with a good measure of odor control. Both technologies provide superior odor control when compared to conventional windrow operations. These two technologies were evaluated in a composting facility study to determine how the odor control performance compared for a 42,000 ton per year capacity composting operation. Compost process emissions concentrations and flows from the proposed facilities were used to determine overall emissions estimates and to perform odor dispersion models. Graphic representation of the odor control performance of these operations could then be compared.

This presentation will summarize the comparison of the two technical approaches in terms of overall process flow, emissions assumptions and resultant odor emissions produced. Emissions information for windrow processing will also be presented as a comparison. This information will be useful for planners, administrators, engineers and operators who are considering the development of composting operations.

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