Open AccessModelling the Influence of Evaporation on Residual Chlorine in Water Storage Tanks Using CFD
Author(s) -
John Tulirinya,
Richard O. Awichi,
Fulgensia M Kamugisha,
Moses Nagulama
Publication year - 2021
Publication title -
east african journal of engineering/east african journal of engineering
Language(s) - English
Resource type - Journals
eISSN - 2707-5397
pISSN - 2707-5389
DOI - 10.37284/eaje.3.1.357
Subject(s) - evaporation , chlorine , residual , storage tank , environmental science , limiting , computational fluid dynamics , chemistry , environmental engineering , waste management , meteorology , thermodynamics , engineering , mechanical engineering , computer science , physics , organic chemistry , algorithm
Water storage tanks are usually utilized in water distribution systems (WDS) to meet the water demand fluctuations. Chlorine is the most common disinfectant used to disinfect water supplies. However, variations in the rate of chlorine decay in these storage tanks are one of the greatest limiting factors in ensuring adequate water treatment process and giving guarantee to its efficiency. These variations could be due to some inadequately tested mechanisms of chlorine reactions in bulk fluid, chlorine reactions with storage tank walls, and natural evaporation. This study presents Computational Fluid Dynamics (CFD) modelling approach to assess the influence of evaporation on residual chlorine in water storage tanks. Findings indicate that an increase in the evaporation rate accelerates the rate at which residual chlorine is lost. It is concluded that temperature is the main factor influencing evaporation, which in turn causes the disappearance of residual chlorine within the water storage tanks.