Water Production

The Cikokol water treatment plant receives surface water from the nearby Cisadane River. It has been built in 1984 and 1998 in 2 stages of 500 l/sec nominal capacity each. In addition, a 80 l/s compact package water treatment plant was added in 1996 to meet the ever increasing water demand.

The raw water intake is built on the bank of the Cisadane River , close to the bridge and water gate No 10, downstream the irrigation canal.

The water is pumped through a set of fixed coarse screens which are now totally insufficient in view of the quantity of floating materials and plastic transported by the river.

From the intake, the raw water is pumped to the treatment plants through a 900mm steel pipe ( to the main plant) and a 300mm PVC pipe (to the smaller package plant). The pumping consists of 5 pumping sets for the main plant : 3 Nos 250l/s inclined axial pumps, 1 No 600l/s vertical turbine pump and 1 No 500l/s vertical turbine pump. In addition there are 3 Nos 300m3/h vertical pumps for the package plant.

From the 900mm transmission pipe, the raw water is equally divided and discharged into the two flash mixer tanks, each having a dimension of 2.5 X 2.5 m and an effective depth of 2.68 m, I.e a retention time of 33 seconds at the nominal capacity of 1000 l/s. The treatment process comprised addition of aluminium sulphate coagulant and occasionally lime for pH adjustment.

The water is then distributed into 6 flocculation tanks, each consisting of 2 compartments, dimensions 8m X 8m and a water depth of 3.12 m , corresponding to a retention time of 20 minutes at nominal capacity. Each compartment includes 4 Nos 2 blades vertical slow speed mixers.

The water then passed to 6 sedimentation tanks, each having the dimensions of 40m X 8m and a water depth of 3.85m where the floc is allowed to settle.

The clarified surface water is collected into several sets of troughs from which it flows into 12 rapid sand filters of 30.75 m2 each where most of the remaining finer particles are retained.

In order to kill bacteria and viruses the disinfection of the water is conducted at different stages of the process. This disinfection is done by dosing chlorine in the water and maintaining a free chlorine residual in the distribution network.

After treatment the filtered water is collected into 2 underground concrete reservoirs having a capacity of 8,000 M3 each, representing a 4.44 hours total storage capacity at 1000l/s, and from which it is pumped to the distribution network.

The distribution pumps consist of 3 (three) units of 
double suction volute pump @ 300 L/sec, head 50 m with 200 kW motor and 2 (two) units of double suction volute pump @ 500 L/sec, head 50 m with 315 kW motor. 

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