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  • Hybrid constructed wetlands system with intermittent feeding applied for urban wastewater treatment in South Brazil

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    Accepted Manuscript (AM)
    Author(s)
    Rousso, Benny Zuse
    Pelissari, Catiane
    dos Santos, Mayara Oliveira
    Sezerino, Pablo Heleno
    Griffith University Author(s)
    Rousso, Benny Z.
    Year published
    2019
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    Abstract
    Hybrid constructed wetlands composed by vertical flow constructed wetland (VFCW) followed by horizontal subsurface flow constructed wetland (HFCW) are a wastewater treatment technology employed worldwide. However, there are few studies of their application in Brazil. Treatment performance is not achieved directly after the start of operation and may change according to external conditions over time. This paper evaluated a VFCW–HFCW hybrid system applied to treat urban wastewater in southern Brazil during the first 70 operational weeks. The system was operated with cycles of rest and feed periods. The results point to the ...
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    Hybrid constructed wetlands composed by vertical flow constructed wetland (VFCW) followed by horizontal subsurface flow constructed wetland (HFCW) are a wastewater treatment technology employed worldwide. However, there are few studies of their application in Brazil. Treatment performance is not achieved directly after the start of operation and may change according to external conditions over time. This paper evaluated a VFCW–HFCW hybrid system applied to treat urban wastewater in southern Brazil during the first 70 operational weeks. The system was operated with cycles of rest and feed periods. The results point to the first 10 weeks of operation as a transitioning period, especially for VFCW, after which chemical oxygen demand (COD) (from 77% to 90%) and total suspended solids (TSS) (from 90% to 100%) removal performances stabilized and reached their peak rates. Factors such as rainfall precipitation, macrophytes' adaptation, and time of operation affected pollutants' removal. Regardless of the fluctuations throughout the period, the hybrid system presented resilience by generating excellent average removal rates. It showed a mean removal efficiency of 99% for TSS, 98% for COD, 69% for total nitrogen (TN), 91% for NH4+-N, and 96% for P-PO43−. Moreover, the effluent was always suitable to be discharged into the environment according to Brazilian national and state regulations.
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    Journal Title
    Journal of Water, Sanitation and Hygiene for Development
    Volume
    9
    Issue
    3
    DOI
    https://doi.org/10.2166/washdev.2019.010
    Copyright Statement
    © IWA Publishing 2019. This is the author-manuscript version of this paper. The definitive peer-reviewed and edited version of this article is published in Journal of Water, Sanitation and Hygiene for Development (2019) 9 (3): 559–570, https://doi.org/10.2166/washdev.2019.010 and is available at www.iwapublishing.com
    Subject
    Environmental management
    Pollution and contamination
    Environmental engineering
    Urban and regional planning
    Science & Technology
    Physical Sciences
    Water Resources
    hydraulic regime
    startup
    Publication URI
    http://hdl.handle.net/10072/396603
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