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metadata.artigo.dc.title: Evaluation of the effects of drainage and different rest periods as techniques for unclogging the porous medium in horizontal subsurface flow constructed wetlands
metadata.artigo.dc.creator: Teixeira, Denis Leocádio
Matos, Antonio Teixeira de
Matos, Mateus Pimentel de
Miranda, Suymara Toledo
Vieira, Delilah Pires
metadata.artigo.dc.subject: Wastewater treatment
Remediation of clogging
Drainable porosity
Surface runoff
Volatile solids
Tratamento de águas residuais
Remediação de entupimento
Porosidade drenável
Escoamento superficial
Sólidos voláteis
metadata.artigo.dc.publisher: Elsevier Sep-2018
metadata.artigo.dc.identifier.citation: TEIXEIRA, D. L. et al. Evaluation of the effects of drainage and different rest periods as techniques for unclogging the porous medium in horizontal subsurface flow constructed wetlands. Ecological Engineering, Oxford, v. 120, p. 104-108, Set. 2018.
metadata.artigo.dc.description.abstract: The development of easy-to-perform techniques for unclogging of horizontal subsurface flow constructed wetlands (HSSF-CW) is essential to make them operationally simpler and increase their useful life. The objective of this work was to evaluate the drainable porosity, the extension of the bed presenting surface runoff and the characterization and quantification of the constituent solids clogging the porous medium of the HSSF-CW, after they were drained and submitted to different rest periods. Three systems were evaluated measuring 1.0 m wide and 4.0 m long, with 0.25 m working depth; one was cultivated with Vetiver grass (Chrysopogon zizanioides), the other with Tifton 85 (Cynodon spp.) and a control, in which no plant species were cultivated, where all were used for the treatment of municipal wastewater and presented conditions of partially clogged porous medium. After drainage of the system, the drainable porosity of the porous medium increased exponentially with the rest time during which they remained unsaturated, where the control and the HSSF-CW cultivated with Tifton 85 grass tended to stabilize. There was an increase in porosity of 18, 19 and 39% in relative to the initial porosity for the control HSSF-CW and those cultivated with the Tifton 85 and Vetiver grasses, respectively. Surface runoff in the HSSF-CW bed stopped completely between the 7th and 13th days after draining. However, no change was observed in the volatile solids content in the clogging material of the porous medium due to drainage of the HSSF-CWs.
metadata.artigo.dc.language: en_US
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