Pollutant removal by Canna Generalis in tropical constructed wetlands for domestic wastewater treatment
Constructed wetlands have not been commonly used in Vietnam due to the lack of information in the selection of proper types of constructed wetlands, type of reeds, design parameters and performance efficiency, in tropical climates. This paper focuses on <em>Canna generalis,</em> which is...
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2019-07-01
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| Series: | Global Journal of Environmental Science and Management |
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| author | H.D. Tran H.M.T. Vi H.T.T. Dang R.M. Narbaitz |
| author_facet | H.D. Tran H.M.T. Vi H.T.T. Dang R.M. Narbaitz |
| author_sort | H.D. Tran |
| collection | DOAJ |
| description | Constructed wetlands have not been commonly used in Vietnam due to the lack of information in the selection of proper types of constructed wetlands, type of reeds, design parameters and performance efficiency, in tropical climates. This paper focuses on <em>Canna generalis,</em> which is a common reed and easy to grow both in water and wet land conditions. Two kinds of hybrid constructed wetlands were employed, including Facultative pond combined with free water sub-surface constructed wetlands system and horizontal subsurface flow combined with Aerobic pond system. It was found that the ponds played an important role in the hybrid system performance and enhanced the performance of constructed wetlands. The pollutant removal efficiencies of the hybrid systems were all higher than the single constructed wetlands. The BOD<sub>5</sub>, TSS, NH<sub>4</sub>-N and PO<sub>4</sub>-P removal efficiencies averaged 81%, 85%, 93% and 77%, respectively for the hybrid horizontal subsurface flow constructed wetlands system operated at a hydraulic loading rate of 0.075 m/day, while they were 89%, 97%, 97%, and 68%, respectively for the hybrid free water sub-surface constructed wetlands system operated at a hydraulic loading rate of 0.1 m/day. The removal rate constants (k<sub>BOD5, </sub>k<sub>NH4-N, </sub>k<sub>PO4-P</sub>) of the experimental hybrid constructed wetlands were similar to those in previous studies. However, these constants were higher for the hybrid free water subsurface constructed wetlands because of the modified structure flow of the free water subsurface constructed wetlands applied in this study, compared to conventional ones, as well as the additional benefits of the ponds in the hybrid systems. |
| format | Article |
| id | doaj-art-83934da2b40a437aad00f082257aaf08 |
| institution | Kabale University |
| issn | 2383-3572 2383-3866 |
| language | English |
| publishDate | 2019-07-01 |
| publisher | GJESM Publisher |
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| series | Global Journal of Environmental Science and Management |
| spelling | doaj-art-83934da2b40a437aad00f082257aaf082025-02-02T21:37:47ZengGJESM PublisherGlobal Journal of Environmental Science and Management2383-35722383-38662019-07-015333134410.22034/GJESM.2019.03.0635321Pollutant removal by Canna Generalis in tropical constructed wetlands for domestic wastewater treatmentH.D. Tran0H.M.T. Vi1H.T.T. Dang2R.M. Narbaitz3Department of Water Supply and Sanitation, Faculty of Environmental Engineering, National University of Civil Engineering, VietnamDepartment of Environmental Engineering, Thai Nguyen University, Tan Thinh Ward, Thai Nguyen, VietnamDepartment of Water Supply and Sanitation, Faculty of Environmental Engineering, National University of Civil Engineering, VietnamDepartment of Civil Engineering, University of Ottawa, 161 Louis Paster Pvt., Ottawa k1N 6N5, CanadaConstructed wetlands have not been commonly used in Vietnam due to the lack of information in the selection of proper types of constructed wetlands, type of reeds, design parameters and performance efficiency, in tropical climates. This paper focuses on <em>Canna generalis,</em> which is a common reed and easy to grow both in water and wet land conditions. Two kinds of hybrid constructed wetlands were employed, including Facultative pond combined with free water sub-surface constructed wetlands system and horizontal subsurface flow combined with Aerobic pond system. It was found that the ponds played an important role in the hybrid system performance and enhanced the performance of constructed wetlands. The pollutant removal efficiencies of the hybrid systems were all higher than the single constructed wetlands. The BOD<sub>5</sub>, TSS, NH<sub>4</sub>-N and PO<sub>4</sub>-P removal efficiencies averaged 81%, 85%, 93% and 77%, respectively for the hybrid horizontal subsurface flow constructed wetlands system operated at a hydraulic loading rate of 0.075 m/day, while they were 89%, 97%, 97%, and 68%, respectively for the hybrid free water sub-surface constructed wetlands system operated at a hydraulic loading rate of 0.1 m/day. The removal rate constants (k<sub>BOD5, </sub>k<sub>NH4-N, </sub>k<sub>PO4-P</sub>) of the experimental hybrid constructed wetlands were similar to those in previous studies. However, these constants were higher for the hybrid free water subsurface constructed wetlands because of the modified structure flow of the free water subsurface constructed wetlands applied in this study, compared to conventional ones, as well as the additional benefits of the ponds in the hybrid systems.https://www.gjesm.net/article_35321_dc150b14811afe228b6bea1bcc85228f.pdfCanna GeneralisConstructed wetlands (CW)Free water subsurface (FWS)Hybrid systemKinetic constantPollutant Removal |
| spellingShingle | H.D. Tran H.M.T. Vi H.T.T. Dang R.M. Narbaitz Pollutant removal by Canna Generalis in tropical constructed wetlands for domestic wastewater treatment Global Journal of Environmental Science and Management Canna Generalis Constructed wetlands (CW) Free water subsurface (FWS) Hybrid system Kinetic constant Pollutant Removal |
| title | Pollutant removal by Canna Generalis in tropical constructed wetlands for domestic wastewater treatment |
| title_full | Pollutant removal by Canna Generalis in tropical constructed wetlands for domestic wastewater treatment |
| title_fullStr | Pollutant removal by Canna Generalis in tropical constructed wetlands for domestic wastewater treatment |
| title_full_unstemmed | Pollutant removal by Canna Generalis in tropical constructed wetlands for domestic wastewater treatment |
| title_short | Pollutant removal by Canna Generalis in tropical constructed wetlands for domestic wastewater treatment |
| title_sort | pollutant removal by canna generalis in tropical constructed wetlands for domestic wastewater treatment |
| topic | Canna Generalis Constructed wetlands (CW) Free water subsurface (FWS) Hybrid system Kinetic constant Pollutant Removal |
| url | https://www.gjesm.net/article_35321_dc150b14811afe228b6bea1bcc85228f.pdf |
| work_keys_str_mv | AT hdtran pollutantremovalbycannageneralisintropicalconstructedwetlandsfordomesticwastewatertreatment AT hmtvi pollutantremovalbycannageneralisintropicalconstructedwetlandsfordomesticwastewatertreatment AT httdang pollutantremovalbycannageneralisintropicalconstructedwetlandsfordomesticwastewatertreatment AT rmnarbaitz pollutantremovalbycannageneralisintropicalconstructedwetlandsfordomesticwastewatertreatment |