Relationships of nitrous oxide fluxes with water quality parameters in free water surface constructed wetlands

Wu, Juan; Zhang, Jian; Jia, Wenlin; Xie, Huijun; Zhang, Bo

doi:10.1007/s11783-009-0023-6

Cited by 17 publications

(5 citation statements)

References 24 publications

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“…The average fluxes were comparable to those reported by Inamori et al (2007) which used experimental scale free water surface flow constructed wetland treating non-point sewage at Tsukuba, Japan. However, average N 2 O emission was lower than the studies of 2.39 and 3.4 mg/m 2 /h reported by Wu et al (2009) and Inamori et al (2007). Seasonal fluctuations of CH 4 and N 2 O emissions were observed in this present study.…”

Section: Discussioncontrasting

confidence: 83%

“…Tropical countries, like Thailand, could have a great benefit of wastewater treatment by constructed wetlands. When constructed wetlands are used for purification of wastewater, the productivity of the ecosystem could increase as well as the production of greenhouse gases (GHGs), which are by-or endproducts of microbial decomposition processes (Inamori et al, 2007;Wang et al, 2008;Liu et al, 2009;Wu et al, 2009). Constructed wetlands, therefore, can be sources of important greenhouse gases.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Plant Species on Methane and Nitrous Oxide Emissions from Constructed Wetlands Treating Municipal Wastewater

Chuersuwan¹,

Suwanvaree²,

Chuersuwan³

2014

RJASET

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This study was conducted to quantify emissions of greenhouse gases (GHGs), methane (CH 4 ) and Nitrous Oxide (N 2 O), 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 CH 4 and N 2 O emissions were in the range of 5.9-11.2 and 0.9-1.8 g/m 2 /h, respectively. Seasonal fluctuations of CH and N 2 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 CH 4 and N 2 O emissions from different plants species were significantly different (p<0.05). Average CH 4 emissions from constructed wetlands planted with Phragmites sp., Cyperus sp. and Canna sp. were 11.2, 6.0 and 5.9 mg/m 2 /h, respectively, while mean N 2 O emissions were 0.9, 1.0 and 1.8 mg/m 2 /h, respectively. Calculated of Global Warming Potential (GWP) found that GWP of CH 4 and N 2 O flux from constructed wetlands planted with Cyperus sp., was the highest (669 mg CO equivalent/m 2 /h), followed by Phragmite sp., (524 mg CO 2 equivalent/m 2 /h) and Canna sp., (434 mg CO equivalent/m 2 /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).

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Section: Discussioncontrasting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Effects of Plant Species on Methane and Nitrous Oxide Emissions from Constructed Wetlands Treating Municipal Wastewater

Chuersuwan¹,

Suwanvaree²,

Chuersuwan³

2014

RJASET

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“…Generally, CWs can be categorized into two types, namely surface flow-constructed wetland (SFCW, also known as free water flow) and subsurface flow-constructed wetland (SSFCW) (Fonder and Headley 2013;Gikas et al 2013). SFCW is an imitation of natural wetland as water flows over the surface of sediment (Wu et al 2009). It is a typical ecological engineering system and can be easily transformed from an existing natural wetland.…”

Section: Introductionmentioning

confidence: 99%

Effect of photosynthetically elevated pH on performance of surface flow-constructed wetland planted with Phragmites australis

Yin

Zhang

et al. 2016

Environ Sci Pollut Res

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Combination of emergent and submerged plants has been proved to be able to enhance pollutant removal efficiency of surface flow-constructed wetland (SFCW) during winter. However, intensive photosynthesis of submerged plants during summer would cause pH increase, which may have adverse effects on emergent plants. In this study, nitrogen transformation of lab-scale SFCW under pH gradient of 7.5, 8.5, 9.5 and 10.5 was systematically investigated. The results showed that total nitrogen (TN) removal efficiency decreased from 76.3 ± 0.04 to 51.8 ± 0.04 % when pH increased from 7.5 to 10.5, which was mainly attributed to plant assimilation decay and inhibition of microbe activities (i.e., nitrite-oxidizing bacteria and denitrifiers). Besides, the highest sediment adsorption in SFCW was observed at pH of 8.5. In general, the combination of submerged and emergent plants is feasible for most of the year, but precaution should be taken to mitigate the negative effect of high alkaline conditions when pH rises to above 8.5 in midsummer.

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“…The "Wetlands" provides a guide to GHG emissions inventories for constructed wetlands used for wastewater treatment, providing measures of CH 4 and N 2 O emissions due to carbon and nitrogen inputs in the wastewater treatment process [45,46]. In particular, CH 4 emissions are associated with BOD in domestic wastewater and N 2 O emissions are associated with the nitrogen content introduced to the wetland via wastewater [47].…”

Section: Ghg Emissions From Vegetation Maintenancementioning

confidence: 99%

Assessment of Carbon Reduction Benefits of A/O-Gradient Constructed Wetland Renovation for Rural Wastewater Treatment in the Southeast Coastal Areas of China Based on Life Cycle Assessment: The Example of Xiamen Sanxiushan Village

et al. 2023

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The enhancement of carbon sequestration and emissions reduction has emerged as a primary concern in China’s rural regions. Nevertheless, numerous completed rural wastewater treatment facilities necessitate retrofitting due to suboptimal operational conditions. Consequently, evaluating the greenhouse gas (GHG) emissions impact and carbon reduction advantages of rural wastewater treatment facility retrofitting is essential. Existing research predominantly focuses on urban wastewater treatment plants, with minimal attention given to GHG emissions impact during the construction and demolition stages of wastewater treatment facilities. In this investigation, we developed a life cycle assessment (LCA)-based evaluation model to appraise the GHG emissions impact and carbon reduction benefits of retrofitting rural wastewater treatment facilities. We examined a renovation project in Sanxiushan Village, Xiamen City, Fujian Province, incorporating the integrated plant treatment technology of constructed wetlands. Our findings indicate that retrofitting offers significant advantages in terms of GHG emissions reduction, even when accounting for implicit GHG emissions. The establishment of supplementary terraced constructed wetlands and landscape greening can yield more substantial carbon reduction benefits. Moreover, we discovered that implicit GHG emissions during the construction stage can be mitigated by employing local, recycled, and low-carbon materials. Modifying vegetation community structure and prioritizing vegetation species selection can enhance the carbon storage capacity of plants, reducing overall life cycle GHG emissions and augmenting emissions reduction benefits. The evaluation model developed in this study can facilitate the promotion of low-carbon construction and operation of rural wastewater treatment facilities.

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Relationships of nitrous oxide fluxes with water quality parameters in free water surface constructed wetlands

Cited by 17 publications

References 24 publications

Effects of Plant Species on Methane and Nitrous Oxide Emissions from Constructed Wetlands Treating Municipal Wastewater

Effects of Plant Species on Methane and Nitrous Oxide Emissions from Constructed Wetlands Treating Municipal Wastewater

Effect of photosynthetically elevated pH on performance of surface flow-constructed wetland planted with Phragmites australis

Assessment of Carbon Reduction Benefits of A/O-Gradient Constructed Wetland Renovation for Rural Wastewater Treatment in the Southeast Coastal Areas of China Based on Life Cycle Assessment: The Example of Xiamen Sanxiushan Village

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