Mechanical evolution of the rotating biological contactor into the 21st century

Abstract

This paper presents a review on the evolution of the mechanical design of rotating biological contactors (RBCs) within the UK. The findings documented have been taken from the biggest mechanical survey on RBCs ever undertaken worldwide and focuses on 300 operational units. The paper looks at the main components of the RBC and discusses the evolution of each member. Mechanical deficiencies associated with each design are briefly presented, giving an insight into reasons for improvements. This is the only known document that details changes in design philosophy employed over the last 30 years, with illustrative examples.

For the purpose of this review, the mechanical evolution of the RBC is focused on three primary sections: media panel designs, media support structures, and auxiliary support systems including bearings, power units, and transmission systems. It is shown that the evolution of media panels has largely been directed by economies of manufacture and operational requirements. However, advances in the mechanical design of the RBC supporting structure, while dependent on media type, are largely influenced by overcoming known mechanical deficiencies as well as increasing operational life. This paper depicts the current technology and practice of UK-based manufacturers and details reasons for mechanical deficiencies.

Keywords

auxiliary support systems bearings biomass mechanical design mechanical evolution mechanical survey media panels media support structure RBC rotating biological contactor transmission systems

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References

Doman

1929 Results of operation of experimental contact filter process with partially submerged rotating plates. Sewage Works J., 1, 1929 555–560.

Tchobanoglous

Burton

F. L.

Wastewater Engineering Treatment, Disposal and Reuse, 3rd edn., 1990 (Metcalf & Eddy Inc., McGraw-Hill).

Gray

N. F.

Biology of Wastewater Treatment, 1989 (Oxford Science Publications, Oxford).

Mba

Bannister

R. H.

Findlay

G. E.

Mechanical redesign of the rotating biological contactor. Water Res., 1999 33 (19), 3679–3688.

ESDU 87023, 1987 ISBN 0856796166, ESDU International Limited.

Mba

Bannister

R. H.

The flow of grease within slow-speed rotating bearings. Internal communication between Cranfield University and Severn Trent Water Limited, UK, 1999 2002.