Back to Search
Start Over
Constructed wetlands integrated with microbial fuel cells for COD and nitrogen removal affected by plant and circuit operation mode
- Source :
- Environmental Science and Pollution Research. 28:3008-3018
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- Organic matter and NH4+-N are two major pollutants in domestic sewage. This study evaluated the influence of plant and circuit operation mode on the performance of constructed wetlands integrated with microbial fuel cells (CW-MFCs) and investigated the removal mechanisms of organic matter and nitrogen. Better chemical oxygen demand (COD) removal was achieved in closed-circuit CW-MFCs regardless of planting or not, with average removal efficiencies of 83.19-86.28% (closed-circuit CW-MFCs) and 76.54-83.19% (open-circuit CW-MFCs), respectively. More than 70% organic matter was removed in the anaerobic region of all CW-MFCs. In addition, the planted CW-MFCs outperformed the unplanted CW-MFCs in ammonium, nitrate, and total nitrogen removal irrespective of circuit connection or not, for example, the NH4+-N removal efficiencies of 95.91-96.82% were achieved in planted CW-MFCs compared with 56.54-59.95% achieved by unplanted CW-MFCs. Besides, 33.14-55.69% of NH4+-N was removed in the anaerobic region. Throughout the experiment, the average voltages of planted and unplanted CW-MFCs were 264 mV and 108 mV, with the corresponding maximum voltage output of 544 mV and 321 mV, respectively. Furthermore, planted CW-MFCs, simultaneously producing a peak power density of 92.05 mW m-3 with a coulombic efficiency of 0.50%, exhibited better than unplanted CW-MFCs (3.29 mW m-3 and 0.21%, respectively) in bioelectricity generation characteristics. Graphical abstract.
- Subjects :
- Microbial fuel cell
Bioelectric Energy Sources
Nitrogen
Health, Toxicology and Mutagenesis
chemistry.chemical_element
Sewage
Wastewater
010501 environmental sciences
01 natural sciences
chemistry.chemical_compound
Nitrate
Environmental Chemistry
Ammonium
Organic matter
0105 earth and related environmental sciences
Biological Oxygen Demand Analysis
chemistry.chemical_classification
Pollutant
business.industry
Chemical oxygen demand
General Medicine
Pulp and paper industry
Pollution
chemistry
Wetlands
Denitrification
business
Subjects
Details
- ISSN :
- 16147499 and 09441344
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Environmental Science and Pollution Research
- Accession number :
- edsair.doi.dedup.....470fe0fdda3c8c2a0ead14e9caf45410