Hybrid constructed wetlands system with intermittent feeding applied for urban wastewater treatment in South Brazil
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Author(s)
Rousso, Benny Zuse
Pelissari, Catiane
dos Santos, Mayara Oliveira
Sezerino, Pablo Heleno
Griffith University Author(s)
Year published
2019
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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 ...
View more >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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View more >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
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