Science Inventory

Trihalomethane precursor reactivity changes in drinking water treatment unit processes during a storm event


Neil, C., Y. Zhao, A. Zhao, J. Neal, M. Meyer, AND J. Yang. Trihalomethane precursor reactivity changes in drinking water treatment unit processes during a storm event. Water Science and Technology: Water Supply. IWA Publishing, London, Uk, 19(7):2098–2106, (2019).


This journal article describes the hydrological perturbation in response to climate and land use changes on drinking water treatment performance on DBP precursor removal and THM formation. The data and conclusions are informational to technical managers in preparation of drinking water adaptation and for better compliance of SWDA rules


Source water quality greatly impacts the efficacy of water treatment unit processes and the formation of trihalomethanes (THMs) such as chloroform and bromoform. Current models of water treatment plant performance may not accurately capture how source water quality variation, such as changes in organic matter content due to storm events and future climate variability, impact treatment unit processes and THM precursor concentrations and reactivities. To investigate these impacts, a field study was conducted wherein water samples were collected along the treatment train for 72 hours following a storm event and analyzed in situ and ex situ for a set of water quality parameters including total organic carbon, UV absorbance, and THM concentrations. This paper presents a comprehensive overview of the sampling and analysis procedures with a focus on the removal of THM precursors, such as total organic carbon (TOC), and relationships between source water quality and THM formation. Results from this study will be used to supplement the development of the model-assisted treatment operation and optimization, particularly regarding the prediction of THM formation.

Record Details:

Product Published Date: 11/01/2019
Record Last Revised: 02/22/2021
OMB Category: Other
Record ID: 350512