An evaluation of alternative media for pebble matrix filtration using clay balls and recycled crushed glass

Rajapakse, Jay & Fenner, Richard (2011) An evaluation of alternative media for pebble matrix filtration using clay balls and recycled crushed glass. Journal of Environmental Engineering, 137(6), pp. 517-524.

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Abstract

Protecting slow sand filters (SSFs) from high-turbidity waters by pretreatment using pebble matrix filtration (PMF) has previously been studied in the laboratory at University College London, followed by pilot field trials in Papua New Guinea and Serbia. The first full-scale PMF plant was completed at a water-treatment plant in Sri Lanka in 2008, and during its construction, problems were encountered in sourcing the required size of pebbles and sand as filter media. Because sourcing of uniform-sized pebbles may be problematic in many countries, the performance of alternative media has been investigated for the sustainability of the PMF system. Hand-formed clay balls made at a 100-yearold brick factory in the United Kingdom appear to have satisfied the role of pebbles, and a laboratory filter column was operated by using these clay balls together with recycled crushed glass as an alternative to sand media in the PMF. Results showed that in countries where uniform-sized pebbles are difficult to obtain, clay balls are an effective and feasible alternative to natural pebbles. Also, recycled crushed glass performed as well as or better than silica sand as an alternative fine media in the clarification process, although cleaning by drainage was more effective with sand media. In the tested filtration velocity range of ð0:72–1:33Þ m=h and inlet turbidity range of (78–589) NTU, both sand and glass produced above 95% removal efficiencies. The head loss development during clogging was about 30% higher in sand than in glass media.

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5 citations in Scopus
4 citations in Web of Science®
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ID Code: 42850
Item Type: Journal Article
Refereed: Yes
Keywords: Pebble matrix filtration, Slow sand filtration, Rural water supply, Non chemical pre-treatment, Alternative media, Clay balls, Recycled crushed glass
DOI: 10.1061/(ASCE)EE.1943-7870.0000350
ISSN: 0733-9372
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ENVIRONMENTAL ENGINEERING (090700)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Deposited On: 13 Jul 2011 13:07
Last Modified: 04 Jun 2014 04:00

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