Remoção de nutrientes por Typha latifolia e Cynodon spp. cultivadas em sistemas alagados construídos

Abstract

Objetivou-se, neste trabalho, avaliar a capacidade extratora de duas espécies vegetais quando cultivadas em sistemas alagados construídos de escoamento subsuperficial horizontal (SACs) para o tratamento das águas residuárias da suinocultura (ARS). Para tal, foram construídos 8 SACs de 2,0 m x 0,5 m x 0,6 m, em fibra de vidro, preenchidos com 0,55 m de brita zero. Nos SAC 2 ; SAC 4 ; SAC 6 e SAC 8, foi cultivada a taboa (Typha latifolia) e nos SAC 3 ; SAC 5 ; SAC 7 e SAC 9 foi cultivado o capim tifton-85 (Cynodon spp.). Os SAC 2 e SAC 3 , SAC 4 e SAC 5 , SAC 6 e SAC 7 e SAC 8 e SAC 9 receberam 163, 327, 461 e 561 kg ha -1 d -1 de DBO, respectivamente. Durante os 120 dias de monitoramento dos SACs, verificou-se que a taboa não se adaptou às condições de exposição avaliadas. As maiores produtividades foram obtidas com a aplicação da carga orgânica média de 327 kg ha -1 d -1 de DBO. O capim tifton-85 foi a espécie vegetal que apresentou maior capacidade extratora de nutrientes, chegando a

Removal of nitrogen, phosphorus, copper and zinc from swine breeding waste water by bermudagrass and cattail in constructed wetland systems

“…The extraction values observed in this study were similar to those observed by MATOS et al (2009) andFIA et al (2011). The extractions are influenced by amounts applied to the systems and by environmental conditions imposed on plants.…”

“…Reports in the literature point to the fact that the absorption of pollutants by vegetation cannot singlehandedly answer for the high efficiencies of pollutant removal (BRAZIL et al, 2007;FIA et al, 2008;FIA, 2009;KANTAWANICHKUL et al, 2009;MATOS et al, 2009;FIA et al, 2011). This fact calls into question the role of macrophytes in these systems, and there is no consensus among researchers about the actual importance of macrophytes in CWSs (Brix, 1997).…”

“…Thus, different removal rates can be related to different environmental conditions, besides the differences in the pretreatment of ARS. FIA et al (2011) obtained lower values of nutrient uptake by cattail due to low biomass production (0.8 and 0.05 kg ha -1 d -1 of N and P). As for bermudagrass, values were also lower than those observed in this study, but closer (4.2 and 0.8 kg ha -1 d -1 of N and P).…”

“…Among the simple solutions, the adoption of constructed wetlands systems (CWSs) stands out as a feasible and inexpensive way to treat (MATOS et al, 2009;FIA et al, 2011). CWSs are reservoirs filled with porous materials of high hydraulic conductivity, typically consisting of gravel, which support the growth of macrophytes and biofilm development.…”

Performance of Tifton 85 Grass Under Fertirrigation With Slaughterhouse Wastewater

“…After the first cut, 60 days after planting, a statistical difference was observed between SW dosages and conventional chemical fertilization (AQT0), as seen in In a study with constructed wetland systems (CWs), Fia et al (2011) concluded that Tifton 85 grass removed about 450 kg ha -1 of TKN and 100 kg ha -1 of P in two cuts after 120 days of cultivation. Fia et al (2014) found that Tifton 85 grass was able to extract between 9.8 and 17.6 kg ha -1 d -1 of TKN and between 0.6 and 1.7 kg ha -1 d -1 of PT, which represented 4.6 and 5.4% of the TKN and PT, respectively, contributed to the system.…”