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Enhanced nitrate-nitrogen removal by modified attapulgite-supported nanoscale zero-valent iron treating simulated groundwater.
J Environ Manage. 2018 May 01; 213:151-158.JE

Abstract

Attapulgite (or palygorskite) is a magnesium aluminium phyllosilicate. Modified attapulgite-supported nanoscale zero-valent iron (NZVI) was created by a liquid-phase reduction method and then applied for nitrate-nitrogen (NO3-N) removal (transformation) in simulated groundwater. Nanoscale zero-valent iron was sufficiently dispersed on the surface of thermally modified attapulgite. The NO3-N removal efficiency reached up to approximately 83.8% with an initial pH values of 7.0. The corresponding thermally modified attapulgite-supported nanoscale zero-valent iron (TATP-NZVI) and NO3-N concentrations were 2.0 g/L and 20 mg/L respectively. Moreover, 72.1% of the water column NO3-N was converted to ammonium-nitrogen (NH4-N) within 6 h. The influence of environmental boundary conditions including dissolved oxygen (DO) concentration, light illumination and water temperature on NO3-N removal was also investigated with batch experiments. The results indicated that the DO concentration greatly impacted on NO3-N removal in the TATP-NZVI-contained solution, and the NO3-N removal efficiencies were 58.5% and 83.3% with the corresponding DO concentrations of 9.0 and 0.3 mg/L after 6 h of treatment, respectively. Compared to DO concentrations, no significant (p > 0.05) effect of light illumination on NO3-N removal and NH4-N generation was detected. The water temperature also has great importance concerning NO3-N reduction, and the removal efficiency of NO3-N at 25 °C was 1.25 times than that at 15 °C. For groundwater, therefore, environmental factors such as water temperature, anaerobic conditions and darkness could influence the NO3-N removal efficiency when TATP-NZVI is present. This study also demonstrated that TATP-NZVI has the potential to be developed as a suitable material for direct remediation of NO3-N-contaminated groundwater.

Authors+Show Affiliations

Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China. Electronic address: ckyshj@126.com.Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.Division of Water Resources Engineering, Department of Building and Environmental Technology, Faculty of Engineering, Lund University, P.O. Box 118, 221 00, Lund, Sweden; Civil Engineering Research Group, School of Computing, Science and Engineering, The University of Salford, Newton Building, Peel Park Campus, Salford, Greater Manchester, M5 4WT, United Kingdom; Department of Civil Engineering Science, School of Civil Engineering and the Built Environment, University of Johannesburg, Kingsway Campus, PO Box 524, Aukland Park, 2006, Johannesburg, South Africa. Electronic address: miklas.scholz@tvrl.lth.se.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29494931

Citation

Dong, Lei, et al. "Enhanced Nitrate-nitrogen Removal By Modified Attapulgite-supported Nanoscale Zero-valent Iron Treating Simulated Groundwater." Journal of Environmental Management, vol. 213, 2018, pp. 151-158.
Dong L, Lin L, Li Q, et al. Enhanced nitrate-nitrogen removal by modified attapulgite-supported nanoscale zero-valent iron treating simulated groundwater. J Environ Manage. 2018;213:151-158.
Dong, L., Lin, L., Li, Q., Huang, Z., Tang, X., Wu, M., Li, C., Cao, X., & Scholz, M. (2018). Enhanced nitrate-nitrogen removal by modified attapulgite-supported nanoscale zero-valent iron treating simulated groundwater. Journal of Environmental Management, 213, 151-158. https://doi.org/10.1016/j.jenvman.2018.02.073
Dong L, et al. Enhanced Nitrate-nitrogen Removal By Modified Attapulgite-supported Nanoscale Zero-valent Iron Treating Simulated Groundwater. J Environ Manage. 2018 May 1;213:151-158. PubMed PMID: 29494931.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Enhanced nitrate-nitrogen removal by modified attapulgite-supported nanoscale zero-valent iron treating simulated groundwater. AU - Dong,Lei, AU - Lin,Li, AU - Li,Qingyun, AU - Huang,Zhuo, AU - Tang,Xianqiang, AU - Wu,Min, AU - Li,Chao, AU - Cao,Xiaohuan, AU - Scholz,Miklas, Y1 - 2018/02/26/ PY - 2017/12/21/received PY - 2018/02/20/revised PY - 2018/02/20/accepted PY - 2018/3/2/pubmed PY - 2018/11/6/medline PY - 2018/3/2/entrez KW - Attapulgite-supported nanoscale zero-valent iron KW - Environmental boundary conditions KW - Groundwater quality control technology KW - Nitrate-nitrogen transformation KW - Palygorskite KW - Pollution treatment KW - Thermally modified SP - 151 EP - 158 JF - Journal of environmental management JO - J. Environ. Manage. VL - 213 N2 - Attapulgite (or palygorskite) is a magnesium aluminium phyllosilicate. Modified attapulgite-supported nanoscale zero-valent iron (NZVI) was created by a liquid-phase reduction method and then applied for nitrate-nitrogen (NO3-N) removal (transformation) in simulated groundwater. Nanoscale zero-valent iron was sufficiently dispersed on the surface of thermally modified attapulgite. The NO3-N removal efficiency reached up to approximately 83.8% with an initial pH values of 7.0. The corresponding thermally modified attapulgite-supported nanoscale zero-valent iron (TATP-NZVI) and NO3-N concentrations were 2.0 g/L and 20 mg/L respectively. Moreover, 72.1% of the water column NO3-N was converted to ammonium-nitrogen (NH4-N) within 6 h. The influence of environmental boundary conditions including dissolved oxygen (DO) concentration, light illumination and water temperature on NO3-N removal was also investigated with batch experiments. The results indicated that the DO concentration greatly impacted on NO3-N removal in the TATP-NZVI-contained solution, and the NO3-N removal efficiencies were 58.5% and 83.3% with the corresponding DO concentrations of 9.0 and 0.3 mg/L after 6 h of treatment, respectively. Compared to DO concentrations, no significant (p > 0.05) effect of light illumination on NO3-N removal and NH4-N generation was detected. The water temperature also has great importance concerning NO3-N reduction, and the removal efficiency of NO3-N at 25 °C was 1.25 times than that at 15 °C. For groundwater, therefore, environmental factors such as water temperature, anaerobic conditions and darkness could influence the NO3-N removal efficiency when TATP-NZVI is present. This study also demonstrated that TATP-NZVI has the potential to be developed as a suitable material for direct remediation of NO3-N-contaminated groundwater. SN - 1095-8630 UR - https://www.unboundmedicine.com/medline/citation/29494931/Enhanced_nitrate_nitrogen_removal_by_modified_attapulgite_supported_nanoscale_zero_valent_iron_treating_simulated_groundwater_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0301-4797(18)30180-4 DB - PRIME DP - Unbound Medicine ER -