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Natural fabrics in slow sand filtration

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conference contribution
posted on 12.02.2018 by Paul Luxton, Nigel Graham
Previous research at Imperial College, London, UK has shown that slow sand filters protected by layers of non-woven synthetic fabrics, namely polypropylene have increased run times in between periods of shut down and regular maintenance, compared to un-protected slow sand filters by up to a factor of 8. This is achieved by the application of fabric layers on the surface of the sand bed. Through careful selection of fabrics, the filtration processes can be concentrated in the fabric layers, hence preventing solids penetration through to the sand, resulting in a reduction in the rate of head loss development. So, as well as extended run times, fabric protected sand filtration can also eliminate the need for sand removal and cleaning. This paper is concerned with replicating these earlier findings through the use of natural fabrics, to a) open up new markets for natural tropical fibres and, b) make available the advantages of protected slow sand filtration to developing countries, utilising local materials and/or minimising the use of foreign exchange. The research has been solely a feasibility study to determine whether natural fibres are suitable materials for the protection of slow sand filters. Other factors, although important, are not considered at this stage.
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Funding

The project described in this paper is supported by the UK Overseas Development Administration.

History

School

  • Architecture, Building and Civil Engineering

Research Unit

  • Water, Engineering and Development Centre (WEDC)

Published in

WEDC Conference

Citation

LUXTON, P. and GRAHAM, N., 1996. Natural fabrics in slow sand filtration. IN: Pickford, J. et al. (eds). Reaching the unreached - Challenges for the 21st century: Proceedings of the 22nd WEDC International Conference, New Delhi, India, 9-13 September 1996, pp.275-278.

Publisher

© WEDC, Loughborough University

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

1996

Notes

This is a conference paper.

Other identifier

WEDC_ID:12709

Language

en

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