title: Fate of NO and NH in the treatment of eutrophic water using the floating macrophyte.
abstract: Use of the floating aquatic macrophyte, , to improve eutrophic water quality is practiced on a large scale in China. Limited information is available on the relative importance of the biological NO or NH removal process during the treatment of eutrophic water using . To investigate the key process responsible for the removal of NO and NH, N-NO (9.98 atom % [at.%] N) or N-NH (10.08 at.% N) was added to obtain eutrophic water with or without the cultivation of . In the unplanted water, considerable proportions of the added N-NO (27.13 ± 4.87%) or N-NH (42.08 ± 7.22%) were assimilated by the developed algae. The growth of controlled algae development in the planted water. Furthermore, the cultivation of stimulated gaseous loss of N by microbial denitrification (8.61 ± 1.70% NO-N loss from N-NO-labeled water). Apart from N loss by denitrification, considerable proportions of the added N-NO (62.01 ± 6.93%) or N-NH (76.76 ± 6.21%) were assimilated into the macrophyte N pools. The fine root detritus of contained a proportion of N (4.37 ± 1.39% in NO-labeled water, 2.03 ± 0.52% in NH-labeled water) that will be returned to the water after decomposition. In addition to N loss via NO emission, an unaccounted proportion of N could be mainly due to gaseous loss as N by denitrification (25.00% in N-NO-labeled water with Eichhornia crassipes)
authors.affiliation: Institute of Agricultural Resources and Environement, Jiangsu Academy of Agricultural Sciences, Nanjing, China. lucy.gaoyan@yahoo.com.cn
authors.forename: Yan
authors.initials: Y
authors.lastname: Gao
authors.forename: Neng
authors.initials: N
authors.lastname: Yi
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Haiqin
authors.initials: H
authors.lastname: Liu
authors.forename: Shaohua
authors.initials: S
authors.lastname: Yan
mesh_terms: D001673:Biodegradation, Environmental; D058440:Denitrification; D031806:Eichhornia / Q000378:metabolism* / Q000382:microbiology; D005068:Eutrophication; D009566:Nitrates / Q000032:analysis / Q000378:metabolism*; D058465:Nitrification; D009587:Nitrogen Isotopes / Q000032:analysis; D018517:Plant Roots / Q000382:microbiology; D000644:Quaternary Ammonium Compounds / Q000032:analysis / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism
chemical_list: D009566:Nitrates; D009587:Nitrogen Isotopes; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical