期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 192, 期 3, 页码 1033-1039出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.06.008
关键词
Nitrate; Groundwater; Denitrification; Intensified biofilm-electrode reactor
资金
- Fundamental Research Funds for the Central Universities [2009PY17]
- Ministry of Education of the People's Republic of China [108027]
- Major Projects in the National Water Pollution Control and Management Technology [2008ZX0702-002]
An intensified biofilm-electrode reactor (IBER) combining heterotrophic and autotrophic denitrification was developed for treatment of nitrate contaminated groundwater. The reactor was evaluated with synthetic groundwater (NO3--N50 mg L-1) under different hydraulic retention times (HRTs), carbon to nitrogen ratios (C/N) and electric currents (1). The experimental results demonstrate that high nitrate and nitrite removal efficiency (100%) were achieved at C/N = 1, HRT = 8 h, and I=10 mA. C/N ratios were reduced from 1 to 0.5 and the applied electric current was changed from 10 to 100 mA, showing that the optimum running condition was C/N = 0.75 and I = 40 mA, under which over 97% of NO3--N was removed and organic carbon (methanol) was completely consumed in treated water. Simultaneously, the denitrification mechanism in this system was analyzed through pH variation in effluent. The CO2 produced from the anode acted as a good pH buffer, automatically controlling pH in the reaction zone. The intensified biofilm-electrode reactor developed in the study was effective for the treatment of groundwater polluted by nitrate. (C) 2011 Elsevier B.V. All rights reserved.
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