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Objetivou-se, neste trabalho, avaliar a capacidade extratora de duas espécies vegetais quando cultivadas em sistemas alagados construídos (SAC) utilizados no tratamento de águas residuárias de laticínios (ARL). As unidades experimentais foram constituídas por cinco SAC cultivados com capim elefante (Pennisetum purpureum schum) e cinco SAC cultivados com capim tifton 85 (Cynodon spp.), com escoamento subsuperficial horizontal. A ARL foi aplicada numa vazão média de 60 L d-1 e tempo de residência hidráulica de 4,8 dias, sendo os SAC submetidos a Taxas de Carregamento Orgânico (TCO) de 66, 130, 190, 320 e 570 kg ha-1 d-1 de DBO. O capim tifton 85 extraiu mais nitrogênio e sódio enquanto o capim elefante extraiu maior quantidade de potássio da ARL, quando cultivado sob as taxas de carregamento orgânico (TCO) avaliadas. A concentração de fósforo na parte aérea e a capacidade extratora foram semelhantes nos dois capins; entretanto, existem evidências de aumento na capacidade de extração desse nutriente pelo capim tifton 85, com o aumento da TCO aplicada nos SAC. The objective of this research was to evaluate the extraction capacity of two plant species when grown in constructed wetland systems (CWS) used for dairy wastewater (DW) treatment. The experimental units were formed by five CWS grown with Pennisetum purpureum schum grass and five CWS cultivated with grass tifton 85 (Cynodon spp.), with horizontal subsurface flow. The DW was applied at an average flow of 60 L d-1 and hydraulic residence time of 4.8 days, and subjected to organic loading rates (ORL) of 66, 130, 190, 320 and 570 kg ha-1 d-1 of BOD. The grass tifton 85 extracted more nitrogen and sodium, while the elephant grass extracted a larger amount of potassium from the DW, when grown under the evaluated organic loading rates (ORL). The concentration of phosphorus in aerial parts of plants and extraction capacity were similar in the two grasses, however, there is evidence of an increase in the extraction this nutrient, by the grass tifton 85, with the increase of the ORL applied in the CWS

Capacidade extratora de plantas em sistemas alagados utilizados no tratamento de águas residuárias de laticínios