Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Do wastewater treatment plants have to be concerned about trihalomethane (THM) formation? After all, THMs are regulated under SDWA to an aggregate concentration of not more than 80 ppb. Ironically, 80 ppb or less is acceptable for drinking water but may not be good enough for wastewater treatment facilities that discharge to receiving streams that are not permitted to have a mixing zone. In some states the in-stream water quality standard for chlorodibromomethane and dichlorobromomethane is less than 1 ppb and for chloroform the limit is as low as 5.7 ppb. For wastewater treatment facilities that have to meet end-of-pipe water quality standards, disinfection with chlorine may cause a violation of the THM limit.

Trihalomethanes are a group of compounds that have a halogen-substituted single carbon compound that is named as a derivative of methane. THMs are formed from a reaction of free chlorine with total organic carbon. There are ten typical trihalomethane compounds; however, only four of them are regulated by the Safe Drinking Water Act. Some states have proposed standards for three of the THM compounds that are more stringent than the standards set by EPA.

Water quality based permitting is becoming common across the United States. States are slowly implementing all of EPA's requirements for their water quality programs which include metals, conventional pollutants, organic chemicals, and toxicity. THMs are merely a subset of the organic chemicals regulated under the water quality programs. If your state is requiring you to monitor for a long list of pollutants, it is the beginning of water quality based permitting. If your permit does not define a mixing zone in the receiving stream, you may find that THMs are only part of a larger problem as you may have to meet water quality standard limits at end-of-pipe. This paper focuses on THMs and discusses several methods to minimize THM formation as well as several THM treatment approaches.
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: 2003-01-01

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