Title:	Characterization and treatment of wood fiber for phosphate removal from water
Author(s):	Eberhardt, Thomas L.
Date:	2005
Source:	In: Proceedings of Environmental Science and Technology, Vol. 1: 355-361
Description:	Treatment of refined aspen wood fiber with aqueous iron salt solutions imparted limited capacities to remove phosphate from test solutions. Alternatively, fiber samples were pretreated with an aqueous solution of a nontoxic anionic polymer, carboxymethyl cellulose (CMC), to provide additional sites to complex iron cations and thereby impart greater phosphate retention. Equilibrium sorption data showed that an increase in phosphate removal capacity could be achieved for a two-stage treatment (4% CMC, 12% ferrous chloride) over the corresponding single-stage iron salt treatment. Analysis of the CMC treated fiber by FTIR spectroscopy demonstrated the presence of the polymer by signals indicative of the carboxylate anion functionality. Sorption of phosphate on treated fiber samples showed a better fit with a Freundlich isotherm model than a Langmuir isotherm model. Results indicate that our biomass-based filtration medium may provide a cost-effective means to remove phosphate from stormwater runoff.
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