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As a one-third partner in the ABR consortium, Earth Tech provided engineering services for planning, design, construction management, operator training, and commissioning for a $650 million upgrade to provide secondary treatment at the Annacis and Lulu Island wastewater treatment plants.
In addition to being one of the largest and most technically advanced treatment plants in the world, the Annacis plant is fully automated, using an Elsag-Bailey Infi90 distributed control system (DCS). The plant can be operated from a central control room or any of the five area control rooms.
Fiber optic cabling located in the tunnels throughout the 50 hectare site are used to support three separate LAN, namely Infi90 process control and exception reporting, Elsag-Bailey HMI PCV client-server Ethernet communications, and the plant MIS Ethernet for business applications. Remote access from any operator console in the Annacis plant provide for off-hour monitoring and control of the Lulu plant.
At the Annacis plant, the control system communicates with more than 4000 instruments, 700 motors, 12 PLC systems, 50 electrical distribution power monitors, 50 feeder protection relays, a 3.2 megawatt cogeneration system and 100 variable frequency drives.
Earth Tech staff developed the control strategies and programmed more than 20 redundant distributed process controllers. Standards for control and operations manuals were developed as on-line documents for the owners’ operations and maintenance staff.
Earth Tech was responsible for the preparation of contract documents, process & instrumentation diagrams, instrument data sheets, loop drawing, control panel drawings, and motor control schematics. In total, more than 10,000 drawings were prepared for the Instrumentation and Control devices.
As part of the design and DCS programming, construction services were provided, which included submittal drawing reviews, installation inspection services, start-up assistance, plant commissioning and operator training.
