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Abstract
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Article Information:
Effects of Plant Species on Methane and Nitrous Oxide Emissions from Constructed Wetlands Treating Municipal Wastewater
Sukanda Chuersuwan, Pongthep Suwanvaree and Nares Chuersuwan
Corresponding Author: Sukanda Chuersuwan
Submitted: June 28, 2013
Accepted: July 08, 2013
Published: May 10, 2014 |
Abstract:
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This study was conducted to quantify emissions of greenhouse gases (GHGs), methane (CH4) and Nitrous Oxide (N2), from free water surface constructed wetlands used for domestic wastewater treatment. All constructed wetlands were monoculture and each plot was planted with Phragmites sp., Cyperus sp., or Canna sp. The average CH4 and N2 O emissions were in the range of 5.9-11.2 and 0.9-1.8 g/m2/h, respectively. Seasonal fluctuations of CH4 and N2 O emissions were observed. The highest fluxes of both GHGs occurred during hot rainy season (July-October) followed by summer and the lowest found in cool season. The mean of CH4 and N2O emissions from different plants species were significantly different (p<0.05). Average CH4 emissions from constructed wetlands planted with Phragmites sp., Cyperus sp. and Cannasp. were 11.2, 6.0 and 5.9 mg/m2/h, respectively, while mean N2O emissions were 0.9, 1.0 and 1.8 mg/m2/h, respectively. Calculated of Global Warming Potential (GWP) found that GWP of CH4 and N2O flux from constructed wetlands planted with Cyperus sp., was the highest (669 mg CO2 equivalent/m2/h), followed by Phragmite sp., (524 mg CO2 equivalent/m2/h) and Cannasp., (434 mg CO2 equivalent/mm2/h), respectively. These results suggested that municipal wastewater treatment by constructed wetlands planted with Canna sp. and Phragmite sp., had potential of lower GHGs emissions into the atmosphere and Phragmite sp., provided the highest removal rate of Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD).
Key words: Constructed wetlands, methane, nitrous oxide, plant species, wastewater treatment, ,
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Cite this Reference:
Sukanda Chuersuwan, Pongthep Suwanvaree and Nares Chuersuwan, . Effects of Plant Species on Methane and Nitrous Oxide Emissions from Constructed Wetlands Treating Municipal Wastewater. Research Journal of Applied Sciences, Engineering and Technology, (18): 3709-3715.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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