Constructed wetland clogging: A proposal for the integration and reuse of existing knowledge

Turon, Clàudia; Comas, Joaquím; Poch, M.

doi:10.1016/j.ecoleng.2009.06.012

Cited by 30 publications

(8 citation statements)

References 31 publications

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“…při přívalových deštích nebo významnějších srážkových událostech, nebo hydraulickým přetěžováním [7] nebo pozvolným zakolmatováním, které způsobuje především nevhodná konstrukce usazovacích nádrží (mechanického předčištění), nebo jejich nesprávné provozování a údržba, např. nedostatečně časté vyvážení usazeného kalu [39].…”

Section: Kolmatace Umělých Mokřadůunclassified

Návrhové parametry, provozní zkušenosti a možnosti intenzifikace umělých mokřadů

Mlejnská¹,

Rozkošný²

2016

VTEI

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Section: Kolmatace Umělých Mokřadůunclassified

Návrhové parametry, provozní zkušenosti a možnosti intenzifikace umělých mokřadů

Mlejnská¹,

Rozkošný²

2016

VTEI

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“…One plausible hypothesis for the high content of mineral solids that have contributed to the rapid clogging state of Gualba wetland is the gravel disaggregation. In SSF CWs, vegetation is removed annually in order to avoid deposition of plant debris on the surface of the wetland (Bécares 2004;Turon et al 2009). This management procedure is generally carried out using heavy machinery that would expose gravel to high mechanical aggression (compacting and attrition forces) and, therefore, may enhance gravel disaggregation.…”

Section: Relation Between Gravel Properties and Cloggingmentioning

confidence: 99%

Mechanical resistance properties of gravel used in subsurface flow constructed wetlands: implications for clogging

Pedescoll

Passos

Alba

et al. 2011

Water Science and Technology

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Gravel constitutes the filter medium in subsurface flow constructed wetlands (SSF CWs) and its porosity and hydraulic conductivity decrease over time (clogging), limiting the lifespan of the systems. Using gravel of poor quality accelerates clogging in wetlands. In this study, gravel samples from six different wetland systems were compared with regards to their mineral composition and mechanical resistance properties. Results showed that both mineralogy and texture are related to mechanical resistance. Accordingly, gravel with high content of quartz (> 80%) showed a lower percentage of broken particles (0.18-1.03%) than those with lower content of quartz (2.42-4.56% media broken). Although granite is formed by high durability minerals, its non-uniform texture results in a lower resistance to abrasion (ca. 10% less resistance than calcareous gravel). Therefore, it is recommended to use gravels composed mainly of quartz or, when it is not available, limestone gravels (rounded and uniform) are recommended instead. The resistance to abrasion (LAA test) seems to be a good indicator to determine the mechanical properties of gravels used in CWs. It is recommended to use gravels with LAA below 30% in order to avoid a rapid clogging due to gravel crumbling and subsequent mineral solids accumulation.

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“…Clogging mechanisms in sand filters for the treatment of wastewater (Hatt & Fletcher 2008;Leverenz et al 2009) and vertical flow constructed wetlands, which operate in a similar way to filters (Turon et al 2009;Pedescoll et al 2009;Hua et al 2010;Knowles et al 2011), have been well researched. However, clogging mechanisms in filters for drinking water treatment have not been examined to the same extent.…”

Section: Introductionmentioning

confidence: 99%

Performance and surface clogging in intermittently loaded and slow sand filters containing novel media

Grace

Healy

Clifford

2016

Journal of Environmental Management

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Constructed wetland clogging: A proposal for the integration and reuse of existing knowledge

Cited by 30 publications

References 31 publications

Návrhové parametry, provozní zkušenosti a možnosti intenzifikace umělých mokřadů

Návrhové parametry, provozní zkušenosti a možnosti intenzifikace umělých mokřadů

Mechanical resistance properties of gravel used in subsurface flow constructed wetlands: implications for clogging

Performance and surface clogging in intermittently loaded and slow sand filters containing novel media

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