Nitrate Removal from Groundwater by Heterotrophic/Autotrophic Denitrification Using Easily Degradable Organics and Nano-Zero Valent Iron as Co-Electron Donors

2018 ◽  
Vol 229 (3) ◽  
Author(s):  
Sihai Hu ◽  
Yaoguo Wu ◽  
Yuanjing Zhang ◽  
Bo Zhou ◽  
Xin Xu
Keyword(s):  
Nitrate Removal ◽  
Electron Donors ◽  
Zero Valent Iron ◽  
Autotrophic Denitrification ◽  
Nano Zero Valent Iron

Enhanced nitrate removal in an Fe0-driven autotrophic denitrification system using hydrogen-rich water

2019 ◽  
Vol 5 (8) ◽  
pp. 1380-1388 ◽  
Author(s):  
Tingting Zhu ◽  
Weiwei Cai ◽  
Bo Wang ◽  
Wenzong Liu ◽  
Kai Feng ◽  
...  
Keyword(s):  
Electron Donor ◽  
Nitrate Removal ◽  
Zero Valent Iron ◽  
Autotrophic Denitrification

Autotrophic denitrification can be driven using zero valent iron (ZVI) as an electron donor.

Effect of nitrate concentration, pH, and hydraulic retention time on autotrophic denitrification efficiency with Fe(II) and Mn(II) as electron donors

2016 ◽  
Vol 74 (5) ◽  
pp. 1185-1192 ◽  
Author(s):  
Jun-feng Su ◽  
Jing-xin Shi ◽  
Ting-lin Huang ◽  
Fang Ma ◽  
Jin-suo Lu ◽  
...  
Keyword(s):  
Electron Donor ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Nitrate Concentration ◽  
Nitrate Removal ◽  
Electron Donors ◽  
Autotrophic Denitrification ◽  
Weakly Alkaline ◽  
Removal Ratio

The role of electron donors (Fe2+ and Mn2+) in the autotrophic denitrification of contaminated groundwater by bacterial strain SY6 was characterized based on empirical laboratory-scale analysis. Strain SY6 can utilize Fe2+ more efficiently than Mn2+ as an electron donor. This study has shown that the highest nitrate removal ratio, observed with Fe2+ as the electron donor, was approximately 88.89%. An immobilized biological filter reactor was tested by using three levels of influent nitrate (10, 30, and 50 mg/L), three pH levels (6, 7, and 8), and three levels of hydraulic retention time (HRT; 6, 8, and 12 h), respectively. An optimal nitrate removal ratio of about 95% was achieved at pH 6.0 using a nitrate concentration of 50 mg/L and HRT of 12 h with Fe2+ as an electron donor. The study showed that 90% of Fe2+ and 75.52% removal of Mn2+ were achieved at pH 8.0 with a nitrate concentration of 50 mg/L and a HRT of 12 h. Removal ratio of Fe2+ and Mn2+ is higher with higher influent nitrate and HRT. A weakly alkaline environment assisted the removal of Fe2+ and Mn2+.

Nano Zero Valent Iron Composites for Water Decontamination: A Review

2018 ◽  
Vol 5 (2) ◽  
pp. 88-101
Author(s):  
Nivedita Shukla ◽  
Amit Saxena ◽  
Vatsana Gupta ◽  
Ashok Singh Rawat ◽  
Sarita Shrivastava ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Water Decontamination ◽  
Nano Zero Valent Iron
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