AWWA IMT98021

The industrial use of reclaimed water has brought to the forefront the need for the effective management of water quality throughout pipe conveyance systems. Water quality computer models are emerging as a powerful, reliable, and cost-effective means of analyzing the dynamics of water quality variations and ensuring that sufficient disinfectant levels are maintained throughout the distribution system at all times. These models are predicated on material mass balance accounting for transport and kinetic reaction processes. They consider first-order reaction kinetics to occur both in the bulk flow and at the pipe wall. However, the use of these models has been limited to drinking water distribution systems. Their application to reclaimed water has not been previously investigated. In this paper a detailed dynamic water quality model of the Central Basin Municipal Water District's reclaimed water system is developed and calibrated as part of a water quality planning and improvement study of the system. Calibration was performed by analyzing chlorine measurements taken at several distributed sites over a 24 hour sampling period. Good agreement between model predictions and observed chlorine levels was obtained at locations where the system hydraulics were well defined. The calibrated model will be used to evaluate various alternative management and operational strategies for improving distribution system water quality effectiveness. The paper describes all phases of the project performed by Central Basin Municipal Water District and Montgomery Watson. It is intended to provide useful information and valuable guidance to organizations considering initiating water quality simulation studies for managing chlorine disinfection practices in their reclaimed water distribution systems.

Product Details

Published:

01/01/1998

ISBN(s):

0898679591

Number of Pages:

17

File Size:

1 file , 130 KB