Study the hydraulic mixing tank to improve the performance of water treatment plants.

In this study, the performance of the oldest drinking water purification project in Ad Diwaniyah city was evaluated and improved. This project is located to the right of Ad Diwaniyah River in the Al-Jazaer neighborhood within the central area of Ad Diwaniyah city. It was completed in 1972. It is thus the oldest project that was established to meet the city's need for potable water. The turbidity removal Efficiency of this project is 60%. That is, the value of the resulting turbidity is 30 NTU, which is more than the required limits according to the Iraqi specifications, which does not exceed 5 NTU, due to the fact that the Clari-floculator is out of service and difficult to maintain. It consumes electrical energy polluting the environment and the lack of regular electrical energy during operation. Therefore, an environmentally friendly Hydraulic Baffle Flocculation was designed with hydraulic power for the purpose of improving the performance of the old Ad Diwaniyah water project and making the quality of the produced water conform to the specifications. Using computer applications (COMSOL Multiphysics). Two models of the environmentally friendly hydraulic slow mixing basin were designed, horizontal and vertical, to arrange the internal baffle, according to the current design capacity of the project, which is 700 m3 /hour, with a volume of 700 m3. The results showed that the performance of the old Al-Ad Diwaniyah water project could be improve by using an environmentally friendly slow-moving hydraulic mixing trough with horizontal baffle with determining the ideal flow rate, ideal alum concentrations, ideal residence time and optimum mixing speed. Where the removal Efficiency of the project reached 98%, meaning that the value of the resulting turbidity is 1 NTU, and this conforms to the Iraqi and World Health Organization specifications for drinking water. [ABSTRACT FROM AUTHOR]