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

The role of electron donors (Fe(2+) and Mn(2+)) in the autotrophic denitrification of contaminated groundwater by bacterial strain SY6 was characterized based on empirical laboratory-scale analysis. Strain SY6 can utilize Fe(2+) more efficiently than Mn(2+) as an electron donor. This study has shown...

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Bibliographic Details
Published in:Water science and technology 2016-09, Vol.74 (5), p.1185-1192
Main Authors: Su, Jun-Feng, Shi, Jing-Xin, Huang, Ting-Lin, Ma, Fang, Lu, Jin-Suo, Yang, Shao-Fei
Format: Article
Language:English
Subjects:
Autotrophic Processes
Bacteria
Biofilms
Bioreactors - microbiology
Carbon
Chemical engineering
Contamination
Denitrification
Drinking water
Electrons
Empirical analysis
Environmental science
Ferrous Compounds
Groundwater
Groundwater pollution
Hydraulic retention time
Hydrogen ions
Influents
Iron
Manganese
Microbiological strains
Microorganisms
Nitrate removal
Nitrates
Nitrates - chemistry
Nitrogen Oxides
Nutrient removal
Performance evaluation
pH effects
Removal
Retention
Retention time
Sulfur
Trace elements
Water pollution treatment
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Summary:The role of electron donors (Fe(2+) and Mn(2+)) in the autotrophic denitrification of contaminated groundwater by bacterial strain SY6 was characterized based on empirical laboratory-scale analysis. Strain SY6 can utilize Fe(2+) more efficiently than Mn(2+) as an electron donor. This study has shown that the highest nitrate removal ratio, observed with Fe(2+) 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 Fe(2+) as an electron donor. The study showed that 90% of Fe(2+) and 75.52% removal of Mn(2+) were achieved at pH 8.0 with a nitrate concentration of 50 mg/L and a HRT of 12 h. Removal ratio of Fe(2+) and Mn(2+) is higher with higher influent nitrate and HRT. A weakly alkaline environment assisted the removal of Fe(2+) and Mn(2+).
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2016.231