Development Of An Iron-amended Biofilter For Removal Of Arsenic From Rural Canadian Prairie Potable Water

Development Of An Iron-amended Biofilter For Removal Of Arsenic From Rural Canadian Prairie Potable Water

The 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 Z...

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Bibliographic Details
Main Authors: Gottinger, A M, Wild, D J, McMartin, D, Moldovan, B, Wang, D
Format: Conference Proceeding
Language:eng
Subjects:
Ammonia
Arsenates
Arsenic
Arsenic removal
Biofilters
Biofiltration
Biological treatment
Contaminants
Drinking water
Groundwater
Groundwater data
Hydrologic data
Iron
Isotherms
Manganese
Pollutant removal
Sand
Sand filters
Water purification
Water treatment
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Summary:The 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 arsenicremoval 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 smallscale 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).
ISSN:1746-448X
1743-3541