Evaluation on the Nanoscale Zero Valent Iron Based Microbial Denitrification for Nitrate Removal from Groundwater

Peng, L; Liu, Y; Gao, SH; Chen, X; Xin, P; Dai, X; Ni, BJ

Evaluation on the Nanoscale Zero Valent Iron Based Microbial Denitrification for Nitrate Removal from Groundwater

Peng, L Liu, Y

Gao, SH Chen, X Xin, P Dai, X Ni, BJ

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Publication Type:: Journal Article
Citation:: Scientific Reports, 2015, 5
Issue Date:: 2015-07-22

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Field	Value	Language
dc.contributor.author	Peng, L	en_US
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961	en_US
dc.contributor.author	Gao, SH	en_US
dc.contributor.author	Chen, X	en_US
dc.contributor.author	Xin, P	en_US
dc.contributor.author	Dai, X	en_US
dc.contributor.author	Ni, BJ https://orcid.org/0000-0002-1129-7837	en_US
dc.date.available	2015-06-24	en_US
dc.date.issued	2015-07-22	en_US
dc.identifier.citation	Scientific Reports, 2015, 5	en_US
dc.identifier.uri	http://hdl.handle.net/10453/126894
dc.description.abstract	Nanoscale zero valent iron (NZVI) based microbial denitrification has been demonstrated to be a promising technology for nitrate removal from groundwater. In this work, a mathematical model is developed to evaluate the performance of this new technology and to provide insights into the chemical and microbial interactions in the system in terms of nitrate reduction, ammonium accumulation and hydrogen turnover. The developed model integrates NZVI-based abiotic reduction of nitrate, NZVI corrosion for hydrogen production and hydrogen-based microbial denitrification and satisfactorily describes all of the nitrate and ammonium dynamics from two systems with highly different conditions. The high NZVI corrosion rate revealed by the model indicates the high reaction rate of NZVI with water due to their large specific surface area and high surface reactivity, leading to an effective microbial nitrate reduction by utilizing the produced hydrogen. The simulation results further suggest a NZVI dosing strategy (3-6 mmol/L in temperature range of 30-40 °C, 6-10 mmol/L in temperature range of 15-30 °C and 10-14 mmol/L in temperature range of 5-15 °C) during groundwater remediation to make sure a low ammonium yield and a high nitrogen removal efficiency.	en_US
dc.relation.ispartof	Scientific Reports	en_US
dc.relation.isbasedon	10.1038/srep12331	en_US
dc.subject.mesh	Nitrates	en_US
dc.subject.mesh	Hydrogen	en_US
dc.subject.mesh	Iron	en_US
dc.subject.mesh	Nitrogen	en_US
dc.subject.mesh	Nitrogen Oxides	en_US
dc.subject.mesh	Water Pollutants, Chemical	en_US
dc.subject.mesh	Temperature	en_US
dc.subject.mesh	Water Purification	en_US
dc.subject.mesh	Metal Nanoparticles	en_US
dc.subject.mesh	Denitrification	en_US
dc.subject.mesh	Groundwater	en_US
dc.title	Evaluation on the Nanoscale Zero Valent Iron Based Microbial Denitrification for Nitrate Removal from Groundwater	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.for	0904 Chemical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	5	en_US

Abstract:

Nanoscale zero valent iron (NZVI) based microbial denitrification has been demonstrated to be a promising technology for nitrate removal from groundwater. In this work, a mathematical model is developed to evaluate the performance of this new technology and to provide insights into the chemical and microbial interactions in the system in terms of nitrate reduction, ammonium accumulation and hydrogen turnover. The developed model integrates NZVI-based abiotic reduction of nitrate, NZVI corrosion for hydrogen production and hydrogen-based microbial denitrification and satisfactorily describes all of the nitrate and ammonium dynamics from two systems with highly different conditions. The high NZVI corrosion rate revealed by the model indicates the high reaction rate of NZVI with water due to their large specific surface area and high surface reactivity, leading to an effective microbial nitrate reduction by utilizing the produced hydrogen. The simulation results further suggest a NZVI dosing strategy (3-6 mmol/L in temperature range of 30-40 °C, 6-10 mmol/L in temperature range of 15-30 °C and 10-14 mmol/L in temperature range of 5-15 °C) during groundwater remediation to make sure a low ammonium yield and a high nitrogen removal efficiency.

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http://hdl.handle.net/10453/126894