Rehabilitation Work of Labugama Kalatuwawa Water Treatment Plants
Labuagama Water Treatment plant being the oldest treatment plant in Sri Lanka was built in 1886 in British colonial era with the objective of providing clean drinking to Colombo. Together with its adjuasant water treatment plant at Kalatuwawa which was built in 1957, they account for a considerable portion of the region’s water demand. Labugama Water Treatment plant is a pristine work of engineering and it has served the people of Sri Lanka for nearly 130 years and is still capable of putting out a noteworthy output.
Labugama and Kalatuwawa water treatment plants were designed to have a nominal production of 60,000 m3/day and 90,000 m3/day which have diminished to a nominal output of 40,000m3/day and 60,000 m3/day due to extensive years of service. It is not just the capacity that has been affected over the time , the working conditions and general cleanliness have also been deteriorated without sufficient funds for maintenance. The technologies used in these treatment plants have been outdated and the network of valves and gates that divert the water flow have been controlled manually and the laboratory testing had been the principle mean of monitoring the water quality, prostrating the daily operations.
Recognizing the vital rehabilitation work required for the said the treatment plants, National Water Supply and Drainage Board initiated a project with a tied aid loan provided by the Government of Hungary together with Access Engineering PLC and Fevarosi Vizumvek of Hungary. Design and the construction of all the non-process components of the project and civil work of process based components were primarily awarded to Access Engineering PLC under a consortium formed by Access engineering PLC and Betonutepito Zrt of Hungary while Betonutepito Zrt proposed and designed the new water treatment process and the supplied all mechanical and electrical materials.
The long awaited rehabilitation work proceeded under the three stages of design, construction and assistance in operations and maintenance. The scope of the work includes the renovation and replacement of existing filters and clarifiers, intake well improvements, modification of aerators and other process structures , design, supply and installation of all M&E equipments, reconstruction and renovation of existing buildings , internal roads and site work, etc,
With the completion of the project by 26th of February 2017, the productive capacities of the treatment plants were extended and the water quality was significantly improved. The excess of water treated after the rehabilitation work, is now supplied to the areas situated in western –east zone of Colombo (Maharagama, Homagama, Padukka, Kaduwela, Seethawaka, Kotte, Kesbewa & Kolonnawa…etc,)
As the Treatment plants were operating during the rehabilitation process, the engineering team at Access Engineering had to go through extensive means to proceed operations with minimum disturbance to the supply of water to the city of Colombo. Yet the team was able to complete the project successfully on the the scheduled time lines.