The potentials of production of biogas from constructed wetland macrophytes

Adeniran, A. E.; Onothoja, Uduoghene B.

doi:10.5897/ajb2017.16052

Cited by 2 publications

(2 citation statements)

References 7 publications

(9 reference statements)

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“…However, higher MTBE volatilization was observed in the root mat system (i.e., CWs only supported by the densely woven root bed) (24%) compared to conventional CWs (<5% total removal) [113], suggesting that the direct contact of aqueous and gaseous phases may facilitate the MTBE volatilization in root mat systems. The volatilization flux of benzene and MTBE varied with the seasons and the highest fluxes were observed in summer [114].…”

Section: Voc Emission From Cwsmentioning

confidence: 99%

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Factors Influencing Gaseous Emissions in Constructed Wetlands: A Meta-Analysis and Systematic Review

Zhu

Bañuelos

et al. 2023

IJERPH

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Constructed wetlands (CWs) are an eco-technology for wastewater treatment and are applied worldwide. Due to the regular influx of pollutants, CWs can release considerable quantities of greenhouse gases (GHGs), ammonia (NH3), and other atmospheric pollutants, such as volatile organic compounds (VOCs) and hydrogen sulfide (H2S), etc., which will aggravate global warming, degrade air quality and even threaten human health. However, there is a lack of systematic understanding of factors affecting the emission of these gases in CWs. In this study, we applied meta-analysis to quantitatively review the main influencing factors of GHG emission from CWs; meanwhile, the emissions of NH3, VOCs, and H2S were qualitatively assessed. Meta-analysis indicates that horizontal subsurface flow (HSSF) CWs emit less CH4 and N2O than free water surface flow (FWS) CWs. The addition of biochar can mitigate N2O emission compared to gravel-based CWs but has the risk of increasing CH4 emission. Polyculture CWs stimulate CH4 emission but pose no influence on N2O emission compared to monoculture CWs. The influent wastewater characteristics (e.g., C/N ratio, salinity) and environmental conditions (e.g., temperature) can also impact GHG emission. The NH3 volatilization from CWs is positively related to the influent nitrogen concentration and pH value. High plant species richness tends to reduce NH3 volatilization and plant composition showed greater effects than species richness. Though VOCs and H2S emissions from CWs do not always occur, it should be a concern when using CWs to treat wastewater containing hydrocarbon and acid. This study provides solid references for simultaneously achieving pollutant removal and reducing gaseous emission from CWs, which avoids the transformation of water pollution into air contamination.

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Section: Voc Emission From Cwsmentioning

confidence: 99%

“…[16]. Adelere and Uduoghene [114] found that, in contrast to CH 4 and CO 2 emission (38~54%), the CO and H 2 S emission only accounted for ~0.03% and ~0.14% of the total biogas production in CWs. They inferred that CO and H 2 S can be converted to H 2 CO 3 and H 2 SO 4 at the stage of the biological remediation process.…”

Section: H 2 S Emission From Cwsmentioning

confidence: 99%