Charles Allen

Biogenic corrosion in sewer tunnels – new approaches and solutions

Director - OtB Concrete Ltd

Presentation

4.45pm – 5.05pm: Charles Allen, OTB Concrete: Biogenic corrosion in sewer tunnels – new approaches and solutions in Singapore

The attack of concrete linings by biogenic corrosion in sewer pipes and tunnels is well documented. As populations grow, new sewer infrastructure is required and many cities are now investing in the construction of large diameter, long, gravity fed sewer tunnels. With sewage becoming more concentrated, retention times in large diameter tunnels becoming longer and global temperatures becoming warmer, the attack of concrete tunnel linings by biogenic corrosion is becoming more prevalent than originally thought.

A proactive approach to tackling this problem has been taken by the Public Utilities Board in Singapore in the construction of its Deep Tunnel Sewer System Phase 2. More recently, a similar approach has been taken in New Zealand.

5.05pm – 5.15pm: Q&A

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