Skip to main content

Ozonization of 2,4-dinitrotoluene and 4-nitroaniline as well as improved dissolved organic carbon removal by sequential ozonization–biodegradation

Buy Article:

$30.00 plus tax (Refund Policy)


The effects of varying pH on substrate removal, nitrate formation, and dissolved organic carbon (DOC) removal during the ozonization of aqueous solutions of 2,4-dinitrotoluene (DNT) and 4-nitroaniline (NA) were investigated in semibatch systems under partially mass-transfer–limited conditions. If ozonization was performed outside the region of strong mass-transfer limitation, a strong pH influence was observed for the treatment of DNT. At pH 2, the rate of DNT removal was small and DNT was poorly degraded. Both nitro groups were split off and immediately oxidized to nitrate at pH 2 and pH 7. An increase in the pH, to a minimum value of 7, during the oxidation of DNT and NA caused radical reactions and, thus, a higher degree of simultaneous DOC removal. Furthermore, nitrogen-containing organic metabolites were produced from DNT because of these radical reactions when the ozonization was carried out at pH 11.

Sequential semibatch ozonization (pH 7) and biodegradation resulted in complete removal of the nitroaromatics and a minimum overall DOC removal of 75% with minimum specific-ozone doses of 4 g/g and 3 g/g for DNT and NA, respectively. Compared to this, no ozone savings were achieved with a continuous-flow chemical–biological treatment system. This effect was caused by the unfavorable reaction conditions in the totally mixed ozonization reactor.


Document Type: Research Article


Publication date: 1998-03-01

More about this publication?
  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
  • Editorial Board
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Membership Information
  • Information for Advertisers
  • WEF Bookstore
  • 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