Arsenic Species Transformation and Transportation in Arsenic Removal by Fe-Mn Binary Oxide–Coated Diatomite: Pilot-Scale Field Study
Publication: Journal of Environmental Engineering
Volume 137, Issue 12
Abstract
The removal of arsenic (As) by iron (Fe)-manganese (Mn) binary oxide–coated diatomite (FMBO-diatomite) and the transformation and transportation of As, Fe, and Mn in a fixed-bed reactor were investigated in this pilot-scale field study (arsenite , arsenate ). Before regeneration, the effluent As(tot) was reduced to less than with no residual As(III). FMBO-diatomite exhibited elevated adsorptive capability of As after in situ regenerations with breakthrough bed volumes increasing from 550 to 760 bed volumes after three cycles of operation. The residual concentrations of As(III) and As(V) at different layers along the adsorption column indicated the oxidation of As(III) and the As transportation during the filter layer. Additionally, FMBO-diatomite could efficiently remove the turbidity, Fe and Mn in influents, without causing secondary pollution. Acid dilution analysis showed more Fe content and less Mn content after three cycles through the FMBO-diatomite upper layer. This was attributable to the oxidation of As(III) and Fe(II) by manganese dioxide () within FMBO and the transportation of Mn(II) thereafter. The backwashing procedure led to a size classification of adsorbents. However, the FMBO-diatomite also showed increased size diameter after three cycles of operation because of the in situ regeneration.
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Acknowledgments
This work was supported by the Funds for the Creative Research Groups of China (UNSPECIFIED50921064), the key project of National “863” High-Tech Research and Development Program of China (UNSPECIFIED2009AA062905), and the crucial project of the National Water Pollution Control and Management Science (UNSPECIFIED2009ZX07424-002-004).
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Information
Published In
Journal of Environmental Engineering
Volume 137 • Issue 12 • December 2011
Pages: 1122 - 1127
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 16, 2010
Accepted: May 24, 2011
Published online: May 26, 2011
Published in print: Dec 1, 2011
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