This slide presentation outlines a study to create an external link between disinfection byproduct (DBP) and chlorine decay
models and an EPANET 2 hydraulic model.
Specific objectives included:
to predict DBP formation and chlorine decay in a network
under steady and unsteady state conditions;
to assess how water quality and treatment conditions affect the
formation of DBPs; and,
to define DBP isopleths and estimate chemical risks at nodes. U.S. Environmental Protection Agency USEPA) empirical models for chlorine decay and DBPs
prediction were selected as water quality models for this
study because they were developed from a wide range of natural sources and
embody a large database, and they
consider water quality and treatment conditions
that affect the formation of DBPs. Conclusions were that:
it is possible to link DBP models and EPANET 2
model externally for direct simulation of DBP
formation in distribution networks and for estimating
chemical risks;
it is possible to minimize DBPs in a network by the
modeling approach; and,
the model is useful in selecting the location of booster
chlorination points to maintain the minimum required
chlorine residual in the network. Recommendations included:
realistic and well calibrated hydraulic models are
needed for optimizing and accurately predicting DBP
formations in a distribution network; and,
since EPANET 2 has limitations in predicting THM
formation, integrating USEPA DBP models with
EPANET 2 internally will make EPANET 2 a very
robust model for predicting DBPs. Includes tables, figures.