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- Title
Potential for CSO treatment with horizontal flow constructed wetlands: influence of hydraulic load, plant presence and loading frequency.
- Authors
Pisoeiro, J.; Galvão, A.; Ferreira, F.; Matos, J.
- Abstract
This study aimed at analysing the performance of horizontal subsurface flow constructed wetlands (CWs) to treat combined sewer overflow (CSO). Four horizontal subsurface flow CWs, organized in two groups (A and B) each with a planted ( Phragmites australis) and a non-planted bed, were loaded with simulated CSO, with group B receiving twice the hydraulic load of group A. Beds were monitored for pH, dissolved oxygen, conductivity, redox potential, chemical oxygen demand (COD), total suspended solids (TSS) and enterococci. Porosity variations were also estimated. Monitoring was conducted during spring and wintertime, with regular and irregular loading frequencies. Results showed an average treatment efficiency of 90-100 % for TSS, 60-90 % for COD and 2-6 log for enterococci. Removal rates were especially relevant in the first 24 h for COD and TSS. TSS and enterococci removal did not exhibit the influence of macrophytes or the applied hydraulic load while COD's removal efficiency was lower in the higher load group and in planted beds.
- Subjects
CONSTRUCTED wetlands &; the environment; COMBINED sewer overflows; HYDRAULICS; CHEMICAL oxygen demand; TOTAL suspended solids; POROSITY
- Publication
Environmental Science & Pollution Research, 2016, Vol 23, Issue 20, p20591
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-016-7212-1