Assessments and improvement of filter media cleanliness in rapid gravity sand filters

Haarhoff, J.; Van Staden, S.J.; Gendenhuys, J.; Sibiya, M.; Naicker, P.; Adam, N.

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Haarhoff, J., Van Staden, S.J., Gendenhuys, J., Sibiya, M., Naicker, P., Adam, N.. Assessments and improvement of filter media cleanliness in rapid gravity sand filters. 2008.

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Please use this identifier to cite or link to this item: http://hdl.handle.net/10210/16810

Title: Assessments and improvement of filter media cleanliness in rapid gravity sand filters
Creator: Haarhoff, J.
Creator: Van Staden, S.J.
Creator: Gendenhuys, J.
Creator: Sibiya, M.
Creator: Naicker, P.
Creator: Adam, N.
Subject: Water treatment filters
Subject: Rapid sand filtration
Subject: Cleanliness
Date: 2008
Description: Introduction: Rapid sand filtration is an essential unit process in the water purification process. It captures and removes coagulated and flocculated material and other suspended matter not removed during the preceding treatment processes. The pores in the filter bed gradually become clogged and the media progressively collects deposit through the continuous use and life of the filter. During normal operations cleaning is initiated by excessive head loss, deterioration in filtrate quality or when the predetermined time for a filter run has elapsed. Air scour, to remove deposit from filter media by vigorous agitation, and wash water, to remove this deposit from the filter bed, are applied. The combined action of air and water should quickly return the media to its original perfectly clean state for the cycle to continue. However, on inspection it is often found that filter sand on purification plants is unacceptably dirty and backwash systems are clearly incapable of cleaning the media to its initial state of cleanliness. It is at times possible to relate the dirty filter media to faulty designs or poor operating procedures, but often the reasons for the media deterioration remain elusive and the media becomes dirtier the longer it is in use. As there was an almost complete lack of published or agreed upon procedures to measure the cleanliness of filter media, rudimentary methods for measuring filter media cleanliness and backwash efficiency were developed. Thereafter filter media from full-scale treatment plants was analyzed with these methods at regular intervals to establish some benchmarks for these determinants. These methods were also applied during the laboratory and pilot plant phases of the project.

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collection(s): Journal articles
Identifier: http://hdl.handle.net/10210/16810
Identifier: uj:15809
Identifier: Citation: Haarhoff, J. et al. 2008. Assessments and Improvement of Filter Media Cleanliness in Rapid Gravity Sand Filters. Report 1525/1/08 to the Water Research Commission, ISBN 978 1 77005 734 0.
Language: English
Type: Report
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Journal articles Assessments and improvement of filter media cleanliness in rapid gravity sand filters

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