Skip to main content

Dual Phase Collection System Odor Investigations: The Liquid Phase Might Not Be Enough!

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

It is a well known fact that investigations of odor production in gravity fed sanitary sewers often involve the need for a full understanding of the liquid phase causes of dissolved sulfide production. Related parameters that are typically investigated include wastewater temperature, pH, existing dissolved sulfide concentration and BOD5.

The question that is rarely answered in these investigations and studies is, “What is causing odorous air to be forced from the gravity collection system?” Without a full understanding of the headspace ventilation and air pressure characteristics of the sewer system, a permanent odor control solution might not be possible. This presentation will focus on a case study from a recent project in which both liquid phase odor production parameters and headspace ventilation and air pressure characteristics were quantified. Analytical techniques and methods will be presented along with the data from these projects that resulted in the implementation of successful odor control solutions.

Figure 1 presents an example of typical air pressure data that was gathered on a recent sanitary sewer odor control project in New Mexico.

The air pressure data shown in Figure 1 was taken in a manhole that was a known source of odor complaints and positive sewer headspace air pressure. This had been determined by desktop analysis and subsequently confirmed by air pressure testing. An in-ground biofilter was designed and built near the location of the manhole to remove odorous air from the gravity sewer and treat it through wood-chip media. Two blowers were installed for the biofilter: one duty and one standby. As shown in Figure 1, the natural air pressure in the manhole (with no blowers running) was upwards of 0.15 inches of water column, which resulted in odorous air being forced from the sewer to atmosphere on a daily basis. When Blower 1 is turned on, the air pressure immediately is reduced to −0.5 inches of water column. Blowers 1 and 2 working simultaneously result in an air pressure value of −0.8 inches of water column. When both blowers are turned off the air pressure immediately returns to approximately 0.15 inches of water column.

The paper will show that this type of analysis is a valuable tool in identifying the ultimate source of odor release in a gravity fed collection system and designing the proper odor control ventilation systems to ensure that odors are no longer released from the sewer pipes.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 2008-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more