Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Wastewater collection and treatment systems can be significant sources of VOC emissions in refineries and petrochemical plants. The ability to estimate VOC emissions from wastewater treatment units is important in identifying the need for and developing technologies for control of VOC emissions. A variety of models have been developed to estimate emissions of specific compounds from various wastewater treatment units, but these models cannot give an estimate of total VOC emissions, primarily because not all of the VOCs in the wastewater can typically be identified. Even if all of the compounds could be identified, however, parameters required by the model (e.g. Henry's Law constant, biodegradation rate constants) are not available for every compound.

Perlmutter et al. (1998), working at the Shell Global Solutions (US) Inc. laboratories, developed a set of three empirical models for total VOC emissions from diffused-air activated sludge systems, each model with a different level of complexity and requiring a different amount of input data. The tiered models were tested in a field validation test using measured VOC emissions from a biotreater at a Shell Oil Company refinery in the U.S. (Perlmutter et al., 1998). Model estimates were found to agree within 16% of the measured VOC emissions.

To provide further support to the models, a second field validation test of the Tier 1 and Tier 2 models was conducted at another Shell Oil Company refinery in the U.S. Biotreater off-gas, influent, and effluent samples were collected and analyzed for total VOCs. Actual VOC emission rates were determined and compared to model estimates.

The Tier 1 model estimates were in close agreement with the measured emissions. The estimated total VOC emissions were within 4% of the total measured VOC emissions. This result is similar to that from the earlier validation study with this model (Perlmutter et al., 1998) The Tier 2 model underestimated total VOC emissions from the biotreater by about 40% when compared with measured emissions. The C1-C5 and C11-C14 range emissions were significantly underestimated while the C6-C10 estimated emissions were slightly high compared to measured emissions. The differences between model estimates and measured emissions for the three carbon ranges showed a similar pattern with what was observed in the previous validation study (Perlmutter et al., 1998), although the error was somewhat greater in this study. Improvements to the Tier 2 model could be made by adjusting the biodegradation factors, β i, in the model, but specific recommendations for adjustment are beyond the scope of this work. Measuredemissions of compounds heavier than C14 were less than 3% of total VOC emissions, validating the assumption made by Perlmutter et al. (1998) that C1 to C14 range compounds comprised the bulk of VOC emissions.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 2004-01-01

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