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Estudou-se a influência da taxa de carga orgânica (TCO) no desempenho de sistemas alagados construídos (SACs) de escoamento subsuperficial. Cada SAC foi constituído por um tanque de 0,40 x 0,73 x 3,00 m. A água residuária de laticínios (ARL) foi aplicada com vazão de 60 L.d-1. O tratamento testemunha foi constituído por um SAC sem vegetação, ao qual foi aplicada uma TCO de 130 kg.ha-1 d-1 de DBO. Nos SACs cultivados com capim-elefante e com capim-tifton 85, foram aplicadas TCOs de 66, 130, 190, 320 e 570 kg.ha-1 d-1 de DBO. Os SACs se mostraram eficientes na remoção de DBO, DQO, SST, ST e nitrogênio. TCOs entre 250 e 400 kg.ha-1 d-1 de DBO proporcionaram maiores eficiências na remoção da carga orgânica e acima de 400 kg.ha-1 d-1 na de sólidos da água residuária. A presença de plantas nos SACs mostrou-se importante na remoção de N, K e Na da ARL. The present paper was carried out to study the influence of organic loading rate (OLR) on the performance of subsurface flow constructed wetlands systems (CWs). Each CW was composed of a sealed tank of 0.40 x 0.73 x 3.00 m. The dairy industry wastewater was applied with flow rate of 60 L.d-1. In the control system, consisting of CW without vegetation, 130 kg.ha-1 d-1 of BOD was applied. In vegetated CWs (cultivated with elephant grass and tifton 85 bermudagrass), OLRs of 66, 130, 190, 320 and 570 kg.ha-1 d-1 of BOD were applied . The CW systems were efficient in the removal of BOD, COD, TSS, TS and nitrogen. OLRs between 250 and 400 kg.ha-1 d-1 BOD provide greater efficiencies in organic loading removal and above 400 kg.ha-1 d-1 in the solids removal from wastewater. The presence of the plants in the CWs showed to be important in the removal of N, K and Na of wastewater

Influência da taxa de carga orgânica no desempenho de sistemas alagados construídos cultivados com forrageiras