AWWA CSC95015

Most available models for describing the mixing and water quality in distribution storage tanks are predicated on the assumption of instantaneous and complete mixing. Important physical processes describing the complex internal mixing and flow interchange characteristics that occur within distribution storage facilities have generally been neglected. This paper presents the formulation and verification of rigorous, explicit mathematical models of distribution storage water quality. These models are based on a compartmental representation of the tank continuum and are formulated analytically from mass balance principles. The models provide the tools to calculate both immediate reactions to short-term inflow and outflow episodes (short-circuiting) and gradual response to long-term use (dead zones). A single solution was derived for each multi-compartment model regardless of chemical species with the only difference being the inclusion of a first-order decay constant to account for the degradation of chlorine. These models can be effectively used for simulating the inner mixing characteristics of distribution storage tanks and subsequent effects on water quality after calibration of parameter constants from accurate measurements of concentration and flow data.

Product Details

Published:

01/01/1995

ISBN(s):

0898677912

Number of Pages:

33

File Size:

1 file , 940 KB