期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 402, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123467
关键词
Dye; Nitrate; Hydroxyl radicals; Denitrifying biocathode-electrocatalytic reactor
资金
- National Natural Science Foundation of China [51608361, 21676200]
- Science & Technology Development Fund of Tianjin Education Commission for Higher Education [2018KJ199]
- Tianjin Science and Technology Planning Project [18PTZWHZ00210]
- Changjiang Scholars and Innovative Research Team in the University of Ministry of Education, China [IRT-17R80]
By coupling the denitrifying biocathode and MnOx/Ti anode, this study successfully removed both carbon and nitrogen pollutants from refractory organic wastewater. The denitrifying biocathode-electrocatalytic reactor (DBECR) showed an efficient removal of NO3--N, with a strong correlation between NO3--N removal and charges/current flowing through the circuit. Additionally, DBECR significantly enhanced the degradation of refractory organic carbon, demonstrating its potential for wastewater treatment.
To simultaneously remove carbon and nitrogen from refractory organic wastewater, this study couples the de-nitrifying biocathode and MnOx/Ti anode to oxidize refractory organic pollutants in the anode chamber and remove NO3--N in the cathode chamber (denitrifying biocathode-electrocatalytic reactor, DBECR). After inoculation, DBECR started up at 1.3 and 1.5 V with NO3--N reduction peak appearing on the cyclic voltammetry curve and increased NO3--N removal by approximately 90 %. Compared to the electrocatalytic reactor without inoculation (ECR), NO3--N removal of DBECR significantly increased from 0.09 to 0.45 kg NO3--N/m(3) NCC/d (NCC: net cathodic compartment). NO3--N removal correlated well with charges/current flowing through the circuit of DBECR, further validating the presence of electrotrophic denitrifiers. Moreover, coupling of denitrifying biocathode significantly enhanced methylene blue (MB) removal in the anode chamber (0.18 +/- 0.002 and 2.92 +/- 0.02 g COD/m(2)/d for ECR and DBECR, respectively). This was because the growth of eletrotrophic denitrifiers increased the cathodic potential and thus the potential of MnOx/Ti anode. The higher potential of MnOx/Ti anode promoted the generation of hydroxyl radicals and consequently promoted MB removal. This study demonstrated that DBECR not only realized nitrogen removal in the cathode chamber, but also enhanced refractory organic carbon degradation in the anode chamber.
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