Mechanistic changes during phytoremediation of perchlorate under different root-zone conditions

International Journal of Phytoremediation
Valentine A NzengungWalter O'Niell

Abstract

Two types of hydroponic bioreactors were used to investigate the mechanisnistic changes during phytoremediation of perchlorate under different root-zone conditions. The bioreactors included: (1) an aerobic ebb-and-flow system planted with six willow trees, and (2) individual willow trees grown in sealed root-zone bioreactors. Rhizosphere probes were used to monitor for the first time during phytoremediation of perchlorate, diurnal swings in oxidation-reduction potential (E(H)), dissolved oxygen (DO), and pH. Radiolabeled (36Cl-labeled) perchlorate was used as a tracer in a subset of the sealed bioreactor experiments to quantify the contribution of phytodegradation and rhizodegradation mechanisms. Rhizodegradation accounted for the removal of 96.1 +/- 4.5% (+/-95% CI) of the initial perchlorate dose in experiments conducted in sealed hydroponic bioreactors with low DO and little or no nitrate N. Meanwhile, the contribution of rhizodegradation decreased to 76 +/- 14% (+/-95% CI) when nitrate (a competing terminal electron acceptor) was provided as the nitrogen source. Slower rates of phytoremediation by uptake and phytodegradation were observed under high nitrate concentrations and aerobic conditions, which allowed perchlorate to...Continue Reading

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Citations

Apr 18, 2006·International Journal of Phytoremediation·Kui TanW Andrew Jackson
Jul 23, 2013·Journal of Hazardous Materials·Krishnakumar BhaskaranPrajeesh Gangadharan Puthiya Veetil
Apr 19, 2011·Ecotoxicology and Environmental Safety·M BoonsanerA Boonsaner
Apr 14, 2012·Environmental Science & Technology·C Phillip ShelorPankaj K Choudhary
Apr 26, 2017·Environmental Science. Processes & Impacts·Yulu TangZhiwei Gan
Jul 3, 2008·Environmental Toxicology and Chemistry·Dawit D Yifru, Valentine A Nzengung
Jan 26, 2006·Environmental Science & Technology·Joshua D ShroutJerald L Schnoor
Jun 23, 2005·Journal of Agricultural and Food Chemistry·C A SanchezL L Neidel

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BETA
environmental stress

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