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

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journal contribution
posted on 2019-09-01, 00:00 authored by Benny Zuse Rousso, Catiane Pelissari, Mayara Oliveira dos Santos, Pablo Heleno Sezerino
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 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.

History

Journal

Journal of Water, Sanitation and Hygiene for Development

Volume

9

Pagination

559-570

Location

London, Eng.

Open access

  • Yes

ISSN

2043-9083

eISSN

2408-9362

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Issue

3

Publisher

IWA Publishing