Abstract
Treatment performance measured in young constructed wetlands related to the particle sizes of the upper layers which receive the raw wastewater is compared with long-term hydraulic security. The objective of the study is to identify treatment limitations related to particle size of the upper mineral layer. In general, a site performs better with age, thanks to the accumulation/evolution of organic deposits on the surface of stage 1. The treatment performance in terms COD and TKN in the cases presented was >80 %. Regarding grading of gravel and sand, performance >90 % was reached even with d10 between 4 and 5 mm, despite an unstable performance tendency observed when the d10 is over 4 mm if at the same time the D60 is over 7 mm. An alternative to granular mineral substrate, whose extraction is a worrying environmental problem, is considered.
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© 2015 Springer International Publishing Switzerland
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Reeb, G., Dantan, E. (2015). Relationship Between Filtering Material and Nitrification in Constructed Wetlands Treating Raw Wastewater. In: Vymazal, J. (eds) The Role of Natural and Constructed Wetlands in Nutrient Cycling and Retention on the Landscape. Springer, Cham. https://doi.org/10.1007/978-3-319-08177-9_15
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DOI: https://doi.org/10.1007/978-3-319-08177-9_15
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