title: Enhanced nitrogen and phosphorus removal from eutrophic lake water by Ipomoea aquatica with low-energy ion implantation.
abstract: Ipomoea aquatica with low-energy N+ ion implantation was used for the removal of both nitrogen and phosphorus from the eutrophic Chaohu Lake, China. The biomass growth, nitrate reductase and peroxidase activities of the implanted I. aquatica were found to be higher than those of I. aquatica without ion implantation. Higher NO3-N and PO4-P removal efficiencies were obtained for the I. aquatica irradiation at 25 keV, 3.9 x 10(16) N+ ions/cm(2) and 20 keV 5.2 x 10(16) N+ ions/cm(2), respectively (p < 0.05). Moreover, the nitrogen and phosphorus contents in the plant biomass with ion implantation were also greater than those of the controls. I. aquatica with ion implantation was directly responsible for 51-68% N removal and 54-71% P removal in the three experiments. The results further confirm that the ion implantation could enhance the growth potential of I. aquatica in real eutrophic water and increase its nutrient removal efficiency. Thus, the low-energy ion implantation for aquatic plants could be considered as an approach for in situ phytoremediation and bioremediation of eutrophic waters.
authors.affiliation: Department of Chemistry, Lab of Environmental Engineering, University of Science and Technology of China, Hefei 230026, China.
authors.forename: Miao
authors.initials: M
authors.lastname: Li
authors.forename: Yue-Jin
authors.initials: YJ
authors.lastname: Wu
authors.forename: Zeng-Liang
authors.initials: ZL
authors.lastname: Yu
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Sheng
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
mesh_terms: D001673:Biodegradation, Environmental; D018533:Biomass; D002681:China; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005068:Eutrophication; D005618:Fresh Water / Q000737:chemistry*; D018525:Germination; D018527:Hydroponics; D007477:Ions; D027741:Ipomoea / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism*; D009584:Nitrogen / Q000302:isolation & purification*; D010758:Phosphorus / Q000302:isolation & purification*; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D007477:Ions; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen