SSP3 Water Treatment Plants
SSP3 has a design capacity of 1050MLD while that of the SSP1 is 950MLD. In total, SPLASH has a capacity of 2000MLD which is equivalent to 45% of the total water supply capacity in Selangor and the Federal Territory until new capacities from the Pahang-Selangor water transfer comes on stream.
Under SSP3, there are treatment plants in Rasa, Hulu Selangor and Bukit Badong n Kuala Selangor. The Rasa Treatment Plant has a design capacity of 250MLD while the Bukit Badong Treatment Plant has a design capacity of 800MLD.
Treatment Process: From River To Tap
At the intake, there is a river gate consisting of motorised gates which control the river level. From the river, raw water is channelled to the floating boom and a coarse screen which traps floating debris. The water then flows through a rotating band screen which traps smaller debris and sediments settle into sand hoppers built into the floor of the intake channel.
Raw water pumps
From here, the water is pumped to the treatment plant via a raw water pipe.
At the treatment plant, the raw water enters the aerator which is designed to create sufficient turbulence to achieve a dissolved oxygen content of 80% saturation at ambient temperature. Pre-lime and a primary coagulant, poly aluminium chloride (PACI) are added.
The raw water then flows to a flash mixing chamber where a flocculant aid (polyelectrolyte) is added. The polymer enhances floc formation for easier removal in the clarification process.
Clarifiers perform the function of floc concentration, collection and discharge. Settled water overflows into collection channels for onward flow to the filters.
Rapid gravity sand filters perform the task of removing fine particles which are not settled in the clarification process. Clarified water is filtered through a sand filter media to trap unsettled particles.
The filtered water is collected at the filtered water channel where sodium silicofluoride is added and the filtered water then flows to a clear water tank.
Disinfection and pH correction
In the clear water tank, chlorine is added for disinfection and tests are carried out to ensure the treated water is free from pathogenic organisms. Hydrated lime is added for pH correction.
The clear water tank
The tank provides sufficient contact tie for the disinfection and conditioning chemicals to work on the water as part of the treatment process.
Treated water pumps
From the clear water tank, treated water is pumped to the balancing reservoir for off-take by the state water supply distribution company.
Treated water stored here is gravitated to smaller service reservoirs which cater to the needs of the consumers. A custody transfer flowmeter records the volume of water supplied to the distribution company.
Water quality monitoring
Treated water quality is tested in the plant laboratory to ensure that water passing through the plant is always clean and safe for consumption. An independent external testing laboratory is also engaged to ensure water quality compliance.
Supervisory Control and Data Acquisition (SCADA)
The SCADA system allows all functions of the plant to be automated and monitored from the control room.
Sludge lagoons are provided for the storage and drying of sludge. The lagoons are used in rotation. As one lagoon is filled, it is isolated for drying and wet sludge is channelled into adjacent lagoon. Dried sludge is removed for disposal as a land fill at a sludge depository.