Pilot Studies of the Ozonation/FBT Process for the Control of Disinfection Byproducts in Drinking WaterEPA Grant Number: R826829
Title: Pilot Studies of the Ozonation/FBT Process for the Control of Disinfection Byproducts in Drinking Water
Investigators: Masten, Susan J.
Institution: Michigan State University
EPA Project Officer: Nolt-Helms, Cynthia
Project Period: July 15, 1998 through May 14, 2001 (Extended to August 15, 2001)
Project Amount: $424,734
RFA: Drinking Water (1998) RFA Text | Recipients Lists
Research Category: Drinking Water , Water
Description:Improvements in Risk Assessment or Risk Management: The formation of trihalomethanes (THMs) and other disinfection by-products (DBPs) during the disinfection of drinking waters poses a significant health risk as a number of DBPs, including chloroform and dichloroacetic acid, have been shown to be either carcinogenic or potentially carcinogenic. A number of DBPs, including dichloroacetic acid, have also been shown to have subchronic toxicity. Additionally, the production of low molecular weight compounds during ozonation can result in significant bacterial regrowth problems in the distribution system, posing a risk to human health due to the presence of microbial pathogens. We believe that through the use of ozonation combined with biological treatment, a system can be designed that will provide disinfection and bacterial regrowth protection, and therefore safeguard human health.
Many water utilities worldwide are currently using ozonation followed by biological filtration to remove organic matter and to control disinfection by-product precursors in drinking water. For the last three years we have been conducting studies of a recirculating ozonation/biological fluidized bed treatment (FBT) process for the control of DBP precursors in drinking water. The studies have shown that the ozonation/FBT process is potentially much more efficient than conventional combined ozonation/biofiltration processes in terms of the removal of NOM and of the control of DBP precursors in drinking water. The objective of this proposed project is to determine the effect of a wide range of water quality characteristics on the feasibility and cost-effectiveness of the combined ozonation/FBT process. The results are expected to demonstrate the applicability of this technology on a national scale.