Rasa
and Bukit Badong |
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Gamuda’s expertise
in the construction of water supply
infrastructure include two of the
biggest water supply treatment plants
in Malaysia’s capital state
of Selangor, supplying a total of
1,050mld of water.
The state’s two largest water
treatment plants were built as part
of the Sungai Selangor Water Supply
Scheme Phase 3 (SSP3).
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The scheme was initiated by the Selangor State
Government in the wake of the 1998 water crisis
and for an efficient source of water supply
to meet the demands of industrial, residential
and population developments.
The Rasa water treatment plant is equipped
with a total treatment capacity of 250mld of
water, while the Bukit Badong water treatment
plant was constructed with a capacity to treat
drinking water up to 800mld.
Click on image for bigger picture.
Feature highlights:
- Intake
At the intake, there is a river gate consisting
of motorised gates which control the river
level. From the river, raw water is channeled
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. Accumulated sediment
is pumped out regularly with sand ejectors.
The raw water then flows to the raw water
pump sump.
- Raw water pumps
From here, the water is pumped to the treatment
plant via a raw water pipe.
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Aerator
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. |
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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
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- Fluoridation
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 time
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
offtake by the state water supply distribution
company.
- Balancing reservoir
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.
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