Thesis Open Access

Water Quality Modeling of Chlorine Residual & Water Age analysis the Case of Cheleleka Bishoftu

Mulatu feyisa Debela

Thesis supervisor(s)

Kenatu Angassa (PhD)

The quality of water has been a key issue in the water industry for most of world. The decline of
treated water can be due to physical, chemical and Biological changes that occur in the water
throughout distribution. The disinfectant and Age of water can affect the quality of the water
being distributed. In this study the purpose was to model and Analysis the decay of chlorine and
water age by using water cad software and supportive other software. In addition the performing
the network considering chlorine concentration, water tracing analysis is done to know the
amount of water exists in system. The simulations were performed with water cad, Google earth
and global mapper software by using extended period. On other hand laboratory result and water
cad result is compared to justify exist water quality problem in Bishoftu, chaleleka water
distribution system. It was found that the chlorine residual in system was highly affected by
duration time and distance they have from reservoir where initial chlorine is added into the
system i.e. reservoir and junctions. The performance of chlorine was high due to high initial
chlorine concentrations, at the around first week of month after addition due to high initial
chlorine concentration, but after the addition around the end of month the residual chlorine
constipation is low. The water age is affected by elevation difference and Demands. To maintain
the chlorine concentrations required by WHO (Chlorine residual must be greater than 0.2 mg/l
and lesser than 0.5 mg/l) chlorination stations were necessary to add initial chlorine into system
by ratio.

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