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Kinetics of Nutrient Removal by Nano Zero-Valent Iron under Different Biochemical Environments.
Water Environ Res. 2015 Jun; 87(6):483-90.WE

Abstract

The effectiveness of nano zero-valent iron (NZVI; an average size of 55 nm at a concentration of 200 mg Fe/L) in nutrient removal was determined under anaerobic, anoxic, and aerobic conditions. Compared to the rate of reduction of nitrate nitrogen (NO3--N) to ammoniacal nitrogen (NH4+-N) by NZVI alone, the presence of activated sludge increased the rate of complete reduction by 300%. About 31% of NO3--N was converted to NH4+-N through NZVI-facilitated dissimilatory nitrate reduction to ammonium, while 56% of NO3--N was removed by heterotrophic denitrification. The presence of sludge reduced the rates of phosphorus removal by NZVI, with the first-order reaction rate constants of 0.06/hour, 0.42/hour, and 0.18/hour under anaerobic, anoxic, and aerobic conditions, respectively. The highest phosphorus removal efficiency (95%) by NZVI was observed under anoxic abiotic conditions, whereas the efficiency dropped to 31% under anaerobic biotic conditions, which was attributed to significant sludge-facilitated NZVI agglomeration.

Authors+Show Affiliations

Department of Civil and Environmental Engineering, University of Missouri, E2509 Lafferre Hall, Columbia, MO 65211, USA.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26459816

Citation

Xu, Shengnan, and Zhiqiang Hu. "Kinetics of Nutrient Removal By Nano Zero-Valent Iron Under Different Biochemical Environments." Water Environment Research : a Research Publication of the Water Environment Federation, vol. 87, no. 6, 2015, pp. 483-90.
Xu S, Hu Z. Kinetics of Nutrient Removal by Nano Zero-Valent Iron under Different Biochemical Environments. Water Environ Res. 2015;87(6):483-90.
Xu, S., & Hu, Z. (2015). Kinetics of Nutrient Removal by Nano Zero-Valent Iron under Different Biochemical Environments. Water Environment Research : a Research Publication of the Water Environment Federation, 87(6), 483-90. https://doi.org/10.2175/106143014X13975035525582
Xu S, Hu Z. Kinetics of Nutrient Removal By Nano Zero-Valent Iron Under Different Biochemical Environments. Water Environ Res. 2015;87(6):483-90. PubMed PMID: 26459816.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetics of Nutrient Removal by Nano Zero-Valent Iron under Different Biochemical Environments. AU - Xu,Shengnan, AU - Hu,Zhiqiang, PY - 2015/10/14/entrez PY - 2015/10/16/pubmed PY - 2015/11/17/medline SP - 483 EP - 90 JF - Water environment research : a research publication of the Water Environment Federation JO - Water Environ. Res. VL - 87 IS - 6 N2 - The effectiveness of nano zero-valent iron (NZVI; an average size of 55 nm at a concentration of 200 mg Fe/L) in nutrient removal was determined under anaerobic, anoxic, and aerobic conditions. Compared to the rate of reduction of nitrate nitrogen (NO3--N) to ammoniacal nitrogen (NH4+-N) by NZVI alone, the presence of activated sludge increased the rate of complete reduction by 300%. About 31% of NO3--N was converted to NH4+-N through NZVI-facilitated dissimilatory nitrate reduction to ammonium, while 56% of NO3--N was removed by heterotrophic denitrification. The presence of sludge reduced the rates of phosphorus removal by NZVI, with the first-order reaction rate constants of 0.06/hour, 0.42/hour, and 0.18/hour under anaerobic, anoxic, and aerobic conditions, respectively. The highest phosphorus removal efficiency (95%) by NZVI was observed under anoxic abiotic conditions, whereas the efficiency dropped to 31% under anaerobic biotic conditions, which was attributed to significant sludge-facilitated NZVI agglomeration. SN - 1061-4303 UR - https://www.unboundmedicine.com/medline/citation/26459816/Kinetics_of_Nutrient_Removal_by_Nano_Zero_Valent_Iron_under_Different_Biochemical_Environments_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1061-4303&date=2015&volume=87&issue=6&spage=483 DB - PRIME DP - Unbound Medicine ER -
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