NSU Research Contributions

Title : Exploratory experiments to determine the effect of alternative operations on the efficiency of subsurface arsenic removal in rural Bangladesh

Authors : M.M. Rahman, M. Bakker, S.C.B. Freitas, D. van Halem, B.M. van Breukelen, K.M. Ahmed, A.B.M. Badruzzaman

Abstract : The principle of subsurface arsenic (As) removal (SAR) is to extract anoxic groundwater, aerate it and reinject it. Oxygen in the injected water reacts with iron in the resident groundwater to form hydrous ferric oxide (HFO). Dissolved As sorbs onto the HFO, which allows for the extraction of groundwater with lower As concentrations. SAR was applied at a rural location in Bangladesh (As in groundwater=200 ?g/L) to study the effect of different operational parameters on SAR performance, including repeated injection and extraction of an equal volume, lower pumping rate, and intermittent pumping. Larger injection volume, lower pumping rate, and intermittent pumping all had positive effects on As removal indicating that As adsorption is kinetically limited. Repeated injection–extraction of an equal volume improved As removal efficiency by providing more HFO for sorption. After injection of 1,000 L, a maximum of 3,000 L of ‘safe’ water, as defined by the Bangladesh national standard for As (

Journal : Hydrogeology Journal	Volume : 23	Year : 2014	Issue :
Pages : 19-34	City :	Edition :	Editors :
Publisher :	ISBN :	Book :	Chapter :
Proceeding Title :	Institution :	Issuer :	Number :