View in EDS

Performance of ornamental plants in mesocosm subsurface constructed wetlands under different organic sewage loading.

Saved in:
Bibliographic Details
Title: Performance of ornamental plants in mesocosm subsurface constructed wetlands under different organic sewage loading.
Authors: Burgos, V.1, Araya, F.1, Reyes-Contreras, C.1, Vera, I.1, Vidal, G.1 glvidal@udec.cl
Source: Ecological Engineering. Feb2017, Vol. 99, p246-255. 10p.
Subjects: Ornamental plants, Wastewater treatment, Plant species, Constructed wetlands, Oxidation-reduction potential, Chemical oxygen demand
Abstract: The aim of this study was to evaluate the performance of ornamental plant species in mesocosm subsurface constructed wetlands (CWs) to treat sewage under different organic loading rates (OLRs). The effect of ornamental plant species was evaluated in four mesocosm CWs with: (a) Iris pseudacorus (MCW-Ip), (b) Eichornia crassipes (MCW-Ec), (c) Tulbaghia violacea (MCW-Tv), and (d) Cyperus papyrus (MCW-Cp). The OLRs were evaluated as follows: (a) 0.47 gCOD/(m 2 d) (Phase I), (b) 0.84 gCOD/(m 2 d) (Phase II), and (c) 1.94 gCOD/(m 2 d) (Phase III). Inside the four mesocosm CWs during the three phases showed oxidation-reduction potential and dissolved oxygen below −50 mV and 0.7 mg/L, respectively, which are characteristic values of anoxic-anaerobic environments. The 5-day biological oxygen demand (BOD 5 ), chemical oxygen demand (COD) and total suspended solids (TSS) removal efficiencies were above 50% for the four mesocosm CWs in the three phases. In the cases of NH 4 + -N and PO 4 −3 -P, removal efficiency was above 70% only for MCW-Cp during the three phases. When the OLR increased, BOD 5 , COD, TSS, NH 4 + -N, PO 4 −3 -P and fecal coliform (FC) effluent concentrations from the four mesocosm CWs were affected in a significant way (α < 0.05) (except PO 4 −3 -P in MCW-Cp). The species of ornamental plant showed non-significant (α > 0.05) effect on COD and BOD 5 effluent concentrations for Phase I, II and III. Conversely, Tulbaghia violacea and Cyperus papyrus had a significant influence (α < 0.05) in the NH 4 + -N, PO 4 −3 -P and FC, effluent concentrations during Phase II and III. Therefore, these two species of ornamental plants have greater potential to treat sewage under different OLRs, even though Tulbaghia violacea is a plant that has not been used previously in CWs. [ABSTRACT FROM AUTHOR]
Copyright of Ecological Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:The aim of this study was to evaluate the performance of ornamental plant species in mesocosm subsurface constructed wetlands (CWs) to treat sewage under different organic loading rates (OLRs). The effect of ornamental plant species was evaluated in four mesocosm CWs with: (a) Iris pseudacorus (MCW-Ip), (b) Eichornia crassipes (MCW-Ec), (c) Tulbaghia violacea (MCW-Tv), and (d) Cyperus papyrus (MCW-Cp). The OLRs were evaluated as follows: (a) 0.47 gCOD/(m 2 d) (Phase I), (b) 0.84 gCOD/(m 2 d) (Phase II), and (c) 1.94 gCOD/(m 2 d) (Phase III). Inside the four mesocosm CWs during the three phases showed oxidation-reduction potential and dissolved oxygen below −50 mV and 0.7 mg/L, respectively, which are characteristic values of anoxic-anaerobic environments. The 5-day biological oxygen demand (BOD 5 ), chemical oxygen demand (COD) and total suspended solids (TSS) removal efficiencies were above 50% for the four mesocosm CWs in the three phases. In the cases of NH 4 + -N and PO 4 −3 -P, removal efficiency was above 70% only for MCW-Cp during the three phases. When the OLR increased, BOD 5 , COD, TSS, NH 4 + -N, PO 4 −3 -P and fecal coliform (FC) effluent concentrations from the four mesocosm CWs were affected in a significant way (α < 0.05) (except PO 4 −3 -P in MCW-Cp). The species of ornamental plant showed non-significant (α > 0.05) effect on COD and BOD 5 effluent concentrations for Phase I, II and III. Conversely, Tulbaghia violacea and Cyperus papyrus had a significant influence (α < 0.05) in the NH 4 + -N, PO 4 −3 -P and FC, effluent concentrations during Phase II and III. Therefore, these two species of ornamental plants have greater potential to treat sewage under different OLRs, even though Tulbaghia violacea is a plant that has not been used previously in CWs. [ABSTRACT FROM AUTHOR]
ISSN:09258574
DOI:10.1016/j.ecoleng.2016.11.058