Development Of An Iron-amended Biofilter For
Removal Of Arsenic From Rural Canadian Prairie
Potable Water
Author(s)
A. M. Gottinger, D. J. Wild, D. McMartin,
B. Moldovan & D. Wang
Abstract
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).
Keywords: arsenic, ZVI/sand filter, adsorption isotherm, slow sand filtration.
Keywords
arsenic, ZVI/sand filter, adsorption isotherm, slow sand filtration
Related Book
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