Efficiency of constructed wetland systems cultivated with black oats treatment of domestic sewage - doi: 10.4025/actascitechnol.v34i4.13990

• Autor(a) principal: Eustáquio Júnior, Valdeir
• Data de Publicação: 2012
• Outros Autores: Matos, Antonio Teixeira de, Lo Monaco, Paola Alfonsa Vieira, Campos, Lidiane Carvalho de, Borges, Alison Carrro
• Tipo de documento: Artigo
• Idioma: por; eng
• Título da fonte: Acta scientiarum. Technology (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/13990
• topic: constructed wetlands; wastewater; pollution control; Engenharia agrícola; engenharia de água e solo

The objective of the present work was to evaluate the efficiency of a constructed wetland system cultivated with black oat (Avena strigosa Schreb) for the treatment of domestic sewage effluent from a septic tank, with emphasis on removal of carbonaceous matter, nutrients (N, P and K) and sodium. The experiment was conducted in four constructed wetland system (CWS) with horizontal subsurface flow for secondary/tertiary treatment domestic sewage. The CWS 1, 2, 3 and 4 received, respectively, organic load rates (OLR) of 100, 200, 400 and 600 kg ha-1 day-1 of BOD. Average efficiencies for removal of BOD, COD, total nitrogen, phosphorus, sodium and potassium were, respectively, 69.5, 70.2, 17.8, 26.2, 14.9 and 16.6%. Low efficiency in the removal of nutrients (N, P and K) was due a high OLR applied which provided also a large input of nutrients to the system. Sodium removal efficiency was low because it is a highly soluble ion and is poorly absorbed by plants. In general, lower OLR result in greater pollutant removals from the domestic sewage.