期刊
WATER SCIENCE AND TECHNOLOGY
卷 74, 期 5, 页码 1185-1192出版社
IWA PUBLISHING
DOI: 10.2166/wst.2016.231
关键词
autotrophic denitrification; ferrous-dependent denitrification; immobilized biological filter reactor; manganese-dependent denitrification; nitrate
资金
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2012BAC04B02]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QA201518]
- Key Laboratory of the Education Department of Shan Xi Province [12JS051]
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+.
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