Effect of district metering area on residual chlorine a case study of the Bangkok Noi water supply system | |
| Author | Krit Laohapiboolrattana |
| Call Number | AIT Thesis no.WM-05-6 |
| Subject(s) | Water-supply Thailand Bangkok Water quality Thailand Bangkok |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Water quality in distribution system is very important because tap water is used for drinking, cooking, consuming and etc. Tap water of very good quality does not have contaminant in water. Especially pathogen is in water. The disinfectant used in distribution system is chlorine, so the amount of chlorine in water is important for water quality. In this study, the effect of district metering area (DMA) on water quality specific to the locations DMA0144-01 named as Bangkok Noi has been done by using the EPANET software, Initially the model was calibrated using the data collected during August 2005. The model network consists of 79 pipe segments ranging in diameter from 100 millimeters (mm) to 300 mm, and 66 junctions (nodes). The absolute difference between the observed and simulated hourly pressures for inlet point and critical point ranges between 0.014-3.068 m. The pressure differences support the assertion that the model is very well calibrated. In addition, the simulation of the transport of residual chlorine was conducted and compared with measured field data at 7 discharge points of the water distribution system in district metering area (DMA) 0144-01 in December, 2005. The measured concentration of residual chlorine range was between 0.2-0.6 milligrams per liter (mg/I). The comparison indicates a difference within the range of 0.01-0.03 mg/I or 2-5 %. Almost, the model indicates a slightly over prediction. However a correlation coefficient of 0.99 indicates a very good correlation between observed concentration and simulated values. Consequently, this water quality simulation is confirming that the model is reasonable calibrated and an acceptable representation of the water distribution system characteristics. The water quality model is applied to study the effect of DMA on residual chlorine concentration. It is found that DMA decreases the chlorine concentration in pipes because the changes in flow direction and flow distribution after the installation of DMA. With the good pressure management, which is the process after setting up DMA, the chlorine concentration will be increased back to the original condition |
| Year | 2006 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Tawatchai Tingsanchali |
| Examination Committee(s) | Gupta, Ashim Das;Babel, Mukand S.;Clemente, Roberto |
| Scholarship Donor(s) | The Royal Thai Government Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |