Mt street res


Transformations of Natural Organic Material During Preozonation

Environmental Protection Agency, 9/1/88- 8/31/91

PI: Reckhow
Students: Purnendu Bose, Boijayanta Bezbarua, Eric Hesse

The objectives of this research were to characterize the changes in the natural organic matter induced by ozone. Specifically, these characterizations include the determination of molecular size, total acidic functional groups, calcium complexation capacity, aluminum complexation capacity, and general hydrophobicity. Effects of ozone dose, pH and radical scavenger concentration on changes in the organic matter during ozonation were evaluated. This information was then used to explain results from a few simple laboratory coagulation and carbon adsorption tests. Most of this work was done on NOM fractions isolated from Forge Pond (collected 7/89).

Proposal and Reports

Project Data

Journal Publications based on this work

Conference presentations based on this work

  • Bose, P., D.A. Reckhow, and B.K. Bezbarua, "Isolation and Extraction of Aquatic Natural Organic Matter: Implications for Removal During Water Treatment," Proc. of the AWWA Annual Conf., Am Wat. Wrks. Assn., Denver, CO, Water Research pp.417-429 (1993), oral presentation, June 3, 1993.
  • Bose, P., D.A. Reckhow, and B.K. Bezbarua, "Effect of Ozonation on Various Properties of Aquatic Natural Organic Matter," oral presentation, International Ozone Congress, San Francisco, August 31, 1993
  • Bose, P., D.A. Reckhow, and B.K. Bezbarua, "Effect of Ozonation on Various Properties of Aquatic Natural Organic Matter," - an update, Proc. Eleventh Ozone World Congr., Int'l Ozone Assn., Lille, France., pp. S-5-69 to S-5-89 (1995).
  • Bezbarua, B.K., D.A. Reckhow, “Modeling Ozone Consumption by Natural Organic Matter,” poster presentation, American Water Works Association, Water Quality Technology Conference, Boston, MA, 17-21 November, 1996
  • Bezbarua, B.K. and D.A. Reckhow, "Modeling Reaction Kinetics of Ozone with Natural Organic Matter", 13th Ozone World Congress, Oct 26-31, 1997, Kyoto, Japan. proceedings, pg. 337-342
  • Reckhow, D.A., J.N. McClellan, B. Mousset and Bezbarua, B.K., “A Comprehensive Look at DBP Precursors and Their Chemical Properties”, preprints of the ACS National Meeting, Anaheim, Vol 39, No.1. pp. 217-218 (1999)
  • Reckhow, DA., Bose, P., Hesse, Eric R., and Lewis, E. New Approaches to DBP Precursor Characterization and Control: Application to Ozonation and Multi-stage Coagulation.  International Workshop on Novel and Enhanced Water Treatment Technologies, Tianjin, China, September 6-7, 2005, Keynote Address., Journal of Harbin Institute of Technology 12[supplement], 160-170. 2005
  • Reckhow, DA, EM Hesse, P. Bose, BK Bezbarua & E. Lewis. “Role of Ozone in NOM Removal and DBP Control”, USA-Vietnam Workshop on Water Pollution Prevention Technologies, Hanoi, Vietnam;  15-18 Nov 2005

Unpublished Manuscripts based on this work

Theses/Dissertations based on this work


Background: In order to respond to increasingly stringent drinking water regulations new and innovative treatment techniques are needed. One very promising new technique is pre-ozonation. It Is well known that preozonation can readily oxidize complexed Fe & Mn, destroy organic color, and remove taste & odor compounds. In some cases, preozonation may also be used in place of prechiorination, and thereby reduce the concentrations of chlorination byproducts in finished waters. Perhaps more important and less well understood, are the gross changes induced by preozonation in natural organic matter. With some waters, these changes have been observed to affect subsequent treatment processes in beneficial ways. For example, preozonation has been found to improve subsequent coagulation or Filtration in an ever growing list of pilot studies. Based on these studies, ozonation Is being incorporated into many US water treatment plants (e.g., Los Angeles, Daytona Beach, New York, Hackensack). The precise nature of the effect of ozone on natural organic matter is not known, as efforts to identify specific ozonation byproducts have been only marginally successful. In order to fully understand the effects of preozonation and better use this technology, all of the organic ozonation byproducts must be characterized in some meaningful fashion.



Return to Dave Reckhow's home page.