Development of an iron amended biofilter for removal of arsenic from rural Canadian prairie potable water

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ConferenceWater Pollution 2010: Tenth International Conference on Modelling, Monitoring and Management of Water Pollution: 09 June 2010, Bucharest, Romania
Pages112; # of pages: 12
SubjectArsenic, ZVI/sand filter, adsorption isotherm, slow sand filtration; Water mains
AbstractThe current study examined the use of a ZVI (zero valent iron)/sand filter for the removal of arsenic (As) from Canadian Prairie ground water sources. Batch isotherm data indicated a favourable reaction represented by the Langmuir isotherm equation with loading capacities of 5000 and 2000 mg As/kg ZVI. Column experiments using arsenate-spiked RO water (50 µg/L) and varying volumetric ratios of ZVI to sand indicated no statistical difference in arsenic-removal performance above a ZVI/sand ratio of 20/80 (%, v/v) with removal efficiencies of greater than 98%. A second column study using two ground water sources with 50/50 and 40/60 ZVI/sand filters achieved 89 ? 96% As removal. A pilot study using a 50/50 ZVI/sand filter integrated into the existing small-scale biological system showed arsenic removal efficiency of approximately 99.7%. By incorporating this ZVI/sand filter into existing biological treatment, it was capable of removing As to concentrations below 0.1 µg/L and reducing the concentrations of other contaminants, such as ammonia, iron and manganese. The overall performance of the pilot system indicates the ZVI/sand filter is a viable option for arsenic removal from drinking water for small communities (populations < 5000).
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number53267
NPARC number20374842
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Record identifier14e17539-2e9c-4427-8966-00cacf4b33f2
Record created2012-07-23
Record modified2016-05-09
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