Transport effects on hydraulic loading rate and microbial removal performance in biosand filters

TitleTransport effects on hydraulic loading rate and microbial removal performance in biosand filters
Publication TypeJournal Article
Year of Publication2014
AuthorsNapotnik, J, Jellison, K
JournalJournal of Water and Health
Date PublishedJan-12-2014
AbstractBiosand filters (BSFs) are increasingly designed using smaller and/or lighter casing material in an effort to reduce logistical requirements and implementation costs. The increased portability of a smaller, lighter design presents a potential negative consequence: the ability to move the installed/operational filter by the homeowner and potentially disturb the system. This study investigated the effects of moving and agitation on filter performance, using mature BSFs which had been in use for over nine months prior to the move. Data were analyzed for four replicate filters of three different filter types: the traditional concrete BSF and two plastic bucket (5-gal and 2-gal, respectively; 5-gal bucket = 18.9-L bucket, 2-gal bucket = 7.6-L bucket) BSFs. Filters were moved approximately 1 km and monitored for hydraulic loading rates (HLRs) and Escherichia coliremoval for 8 weeks following the move. Moving the filters resulted in reduced HLRs, likely due to sand compaction, but E. coli removal remained high (log10 removal ≥2.8 for all sizes) and increased significantly as compared to data collected prior to the move. The resulting operational implications of moving BSFs are discussed.
Short TitleJournal of Water and Health
One Liner: 
Moving concrete and plastic bucket biosand filters 1 km after 9 months of operation reduced the hydraulic loading rate, but significantly increased E. coli removal.