A novel approach for water quality management in water distribution systems by multi-objective booster

Behzadian Moghadam, Kourosh ORCID: https://orcid.org/0000-0002-1459-8408, Alimohammadnejad, M, Ardeshir, A, Jalilsani, F and Vasheghani, H (2012) A novel approach for water quality management in water distribution systems by multi-objective booster. International Journal of Civil Engineering, 10 (1). pp. 51-60.

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Abstract

Compared to conventional chlorination methods which apply chlorine at water treatment plant, booster chlorination has almost
solved the problems of high dosages of chlorine residuals near water sources and lack of chlorine residuals in the remote points
of a water distribution system (WDS). However, control of trihalomethane (THM) formation as a potentially carcinogenic
disinfection by-product (DBP) within a WDS has still remained as a water quality problem. This paper presents a two-phase
approach of multi-objective booster disinfection in which both chlorine residuals and THM formation are concurrently optimized
in a WDS. In the first phase, a booster disinfection system is formulated as a multi-objective optimization problem in which the
location of booster stations is determined. The objectives are defined as to maximize the volumetric discharge with appropriate
levels of disinfectant residuals throughout all demand nodes and to minimize the total mass of disinfectant applied with a specified
number of booster stations. The most frequently selected locations for installing booster disinfection stations are selected for the
second phase, in which another two-objective optimization problem is defined. The objectives in the second problem are to
minimize the volumetric discharge avoiding THM maximum levels and to maximize the volumetric discharge with standard levels
of disinfectant residuals. For each point on the resulted trade-off curve between the water quality objectives optimal scheduling of
chlorination injected at each booster station is obtained. Both optimization problems used NSGA-II algorithm as a multi-objective
genetic algorithm, coupled with EPANET as a hydraulic simulation model. The optimization problems are tested for different
numbers of booster chlorination stations in a real case WDS. As a result, this type of multi-objective optimization model can
explicitly give the decision makers the optimal location and scheduling of booster disinfection systems with respect to the tradeoff
between maximum safe drinking water with allowable chlorine residual levels and minimum adverse DBP levels.

Item Type: Article
Subjects: Construction and engineering > Civil and environmental engineering
Depositing User: Kourosh Behzadian Moghadam
Date Deposited: 05 Jan 2022 22:19
Last Modified: 05 Jan 2022 22:19
URI: http://repository.uwl.ac.uk/id/eprint/8542

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