Skip to main content

The Effects of Liquid Sludge Storage on Biosolids Odor Emissions

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


Soon after the Arlington County Water Pollution Control Plant (WPCP) started operating new centrifuge dewatering and lime stabilization facilities, the County began receiving numerous odor complaints from nearby neighbors. The Arlington County WPCP quickly responded by investigating the causes of the odor complaints. A comprehensive odor study revealed that significant odor emissions were emanating from new odor control scrubbers associated with the new dewatering and stabilization facilities. The odor study showed the new odor control facilities were not effective and liquid sludge storage practices appeared to increase the offensive character of the stabilized biosolids product.

Bench scale studies were performed to evaluate the effects of liquid sludge storage on odor emissions. The bench scale tests provided substantial evidence that storing primary and waste activated sludge created more odorous biosolids, especially if stored more than 24 hours. The bench scale studies also showed that chemical treatment of liquid sludge with chlorine, lime, or iron salts did not significantly reduce odor emissions from the biosolids.

Based on the bench scale tests, the Arlington County WPCP separated the storage of thickened waste activated and primary sludges. Operating and emissions data showed separate storage reduced odor emissions by 50 to 75 percent. Operation and control of the existing scrubbers were also modified. New gas phase chlorine monitors were added and chemical feed systems were improved. The separation of sludges and improvements to the existing scrubbers reduced odor complaints significantly. The Arlington County WPCP is currently designing and constructing further improvements to odor control facilities for liquid and sludge treatment facilities.

Document Type: Research Article


Publication date: January 1, 2000

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 These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Partial Open Access Content
Partial Open access content
Subscribed Content
Subscribed content
Free Trial 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