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Two Egg-Shaped Digesters, Australia

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Egg-shaped digesters (ESDs) offer many operational advantages in waste water treatment plants. A pair of ESDs were completed in 1996 as part of a sewerage treatment plant upgrade at Woodman Point in Perth, Australia. Each digester holds 8,000 m³. The tender for Stage 1 of the plant upgrade also included an equipment room, a mechanical contract for all the necessary process work, an access tower with connecting overhead bridges and a wet gas storage tank for methane. The tender called for design-and-construct submissions and either steel or concrete could be used for the construction of the digesters. A design team combining overseas and local companies was chosen whose tender bid specified prestressed concrete.
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Keywords: Egg-shaped digesters; Hydrostatic pressure; Prestressed concrete; Prestressing; Ring beams; Structural design

Document Type: Research Article

Publication date: 1997-11-01

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    Structural Engineering International (SEI), the quarterly Journal of IABSE, published since 1991, is the leading international journal of structural engineering dealing with all types of structures and materials. SEI offers its readers a unique blend of short profiles on recent structures, and longer, in-depth technical articles on research, development, design, construction and maintenance. Articles are written by practicing engineers and academia from around the world and reflect the high standards of IABSE. IABSE Peer Review stamps are given to papers that have passed through a highly selective review process and demonstrate a significant contribution to the state of structural engineering knowledge.To recognise contributions of the highest quality, an Outstanding Paper Award is presented each year.

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