Black & Veatch completes
world's largest membrane treatment facility in Singapore
uses innovative siphonic action
Singapore (Jan. 2, 2004) – Black
& Veatch announced the full commissioning of its Chestnut Avenue
Water Works (CAWW) extension project for the Public Utilities Board
(PUB) of Singapore. Black & Veatch provided study, pilot testing,
design, and supervision of construction, testing and start-up for the
CAWW extension, which was completed on a fast-track schedule in two
years. The 72-million- gallon-per-day treatment works is now the largest
potable water treatment facility in the world incorporating membrane
The project recently earned the top
prize of the Association of Consulting Engineers Singapore’s (ACES)
Design Excellence Awards for 2003.
The facility uses:
immersed membrane system – a first in Singapore.
gravity-driven system for membrane filtration, reducing pumping costs.
process control systems.
and project management tools for maximum project efficiency in all
stages of development.
typical immersed membrane
plant requires filtrate pumps to provide the necessary pressure across
the membranes,” said
Shing, Black & Veatch CAWW
“Instead, Black & Veatch employed the use of efficient siphonic
action to draw flow through the membranes to significantly simplify the
ultrafiltration membrane plant design, replacing variable-speed filtrate
pumps with simple control valves. The CAWW installation is the world’s
first large-scale plant in this respect.”
siphon system offers savings in pumping costs compared to the normal
variable-speed pumping system and in lower maintenance costs by
requiring fewer pumps and associated electrical controls.
CAWW control system is a hybrid design with a programmable logic
control/supervisory control and data acquisition (PLC/SCADA) system in a
hierarchical structure, integrated with a distributed control system (DCS)
architecture. The CAWW is Singapore’s first water works to incorporate
a large fieldbus network, called Profibus, to control individual process
trains and equipment that contain complex instrumentation and
algorithms. Profibus provides cost and time savings compared to
traditional PLC/SCADA setups.
dual redundant self-healing rings
first for the CAWW is the use of dual redundant self-healing rings on
the main control network running at 100 million bits per second,” said
“The self-healing ring topology overcomes single-point failures by
using Hirshman Ethernet switches. While other projects have employed a
self-healing methodology, CAWW is the first to use dual redundant rings
to cater to multiple breakages and scalability of network speed to
the project is near a
nature reserve, Black & Veatch devoted planning resources to
preserving trees and minimizing disturbances to the natural habitat of
animals. The design minimized the number of trees affected by
construction so as to maintain the habitat of a resident colony of
banded leaf monkeys.
& Veatch is a leading global engineering, construction and
consulting company specializing in infrastructure development in the
fields of energy, water and information. Founded in 1915, Black &
Veatch serves its clients with conceptual and preliminary engineering
services, engineering design, procurement, construction, financial
management, asset management, information technology, environmental,
security design and consulting, and management consulting services.
company’s Web site address is www.bv.com.