Table Of Content

CCYYAANNIIDDEE PPHHYYTTOORREEMMEEDDIIAATTIIOONN:: RREEMMOOVVAALL FFRROOMM AANNDD FFAATTEE IINN SSOOIILL--WWAATTEERR--PPLLAANNTT SSYYSSTTEEMMSS Stephen Ebbs1, Rajat Ghosh2, Joe Bushey3, and David Dzombak4 1 Dept. of Plant Biology, Southern Illinois University Carbondale 2The RetecGroup, Inc. 3Dept. of Environmental Engineering, Syracuse University 4 Dept. of Civil & Environmental Engineering, Carnegie Mellon University AAcckknnoowwlleeddggeemmeennttss ALCOA (cid:132) Gas Technology Institute (GTI) (cid:132) Niagara-Mohawk Power Corp. (NIMO) (cid:132) New York Gas Group (NYGAS) (cid:132) OOvveerrvviieeww Synopsis of cyanide chemistry & contamination (cid:132) Is cyanide phytoremediation feasible? (cid:132) Can cyanide phytoremediation be implemented in (cid:132) the field? Are there ecological risks associated with cyanide (cid:132) phytoremediation? Can the efficacy of cyanide phytoremediation be (cid:132) modeled and predicted? CCyyaanniiddee:: ssoouurrcceess aanndd uusseess Biological sources (cid:132) Aluminum production (cid:132) Electroplating (cid:132) Manufactured gas industry (coal gasification) (cid:132) Ore heap leaching (cid:132) Precious metal mining (cid:132) Road salts (anticaking agent) (cid:132) CCyyaanniiddee ssppeecciiaattiioonn Free (CN-, HCN) or Simple (KCN, NaCN) (cid:132) Toxic, therefore tightly regulated (cid:132) Among the top 30 on CERCLA list (cid:132) Cyanates (-S-CN, O-CN-) (cid:132) Formed in the environment and in vivo (cid:132) Not regulated (cid:132) Metal cyanide complexes (cid:132) Formed in the environment or anthropogenically (cid:132) through reaction with cations (Fe, Zn, Ni) Not regulated (cid:132) IIrroonn ccyyaanniiddee ccoommpplleexxeess Strong complexes (cid:132) Ferricyanide, Fe(CN) 3- (cid:132) 6 Ferrocyanide, Fe(CN) 4- (cid:132) 6 Iron cyanide precipitates (cid:132) Fe (Fe(CN) ) = Prussian blue (cid:132) 4 6 3 Fe (Fe(CN) ) = Turnbull’s blue (cid:132) 3 6 2 Persistent (cid:132) Slow dissociation kinetics (cid:132) Resistant to biodegradation (cid:132) Photosensitive to strong UV light (cid:132) EExxaammpplleess:: iirroonn ccyyaanniiddee ccoonnttaammiinnaattiioonn Former Manufactured Gas Plant site Is cyanide phytoremediation feasible? DDoo ppllaannttss ttrraannssppoorrtt ccyyaanniiddee?? (cid:132)(cid:132) DDoo ppllaannttss ddeettooxxiiffyy aanndd//oorr mmeettaabboolliizzee ccyyaanniiddee?? (cid:132)(cid:132) HHyyddrrooppoonniicc ssyysstteemm sscchheemmaattiicc Sampling ports Willow Pot lid (airtight) Bag pinched PE bag liner in lid Black pot During transpiration 1155NN--llaabbeelleedd ccyyaanniiddee ccoommppoouunnddss wweerree uusseedd ttoo aasssseessss ccyyaanniiddee && iirroonn ccyyaanniiddee ttrraannssppoorrtt 3000 ** control 2500 FeC15N KC15N 1 - W D 1000 g k * N 5 1 g m 500 ** * P<0.007 0 leaf root Willow tissue, leaf or root

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transport in plant-soil-water systems. Dr. Joe Bushey Soil sorption. Φ. Adsorption on. Fe(OH). 3 (s). Me-CN. Solid. > Soil. Fe(CN). 6. 4-. UV. CN-.

Cyanide Phytoremediation Removal From abd Fate in Soil-Water Systems PDF

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transport in plant-soil-water systems. Dr. Joe Bushey Soil sorption. Φ. Adsorption on. Fe(OH). 3 (s). Me-CN. Solid. > Soil. Fe(CN). 6. 4-. UV. CN-.

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Publication Year:	2005
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