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As macrofitas aquaticas sao muito utilizadas como autodepuradoras no tratamento de efluentes com alta carga orgânica em sistemas de wetlands. Porem, se faz necessario um estudo previo da tolerância destas plantas ao tipo de efluente utilizado. Diante desse contexto, este trabalho teve como objetivo principal avaliar a tolerância de uma macrofita ao efluente de um digestor anaerobio de residuos solidos orgânicos. Para tanto, foram montadas wetlands em escala de bancada, vegetadas com a macrofita taboa (Typha domingensis) e irrigadas com o efluente de um biodigestor de residuos solidos orgânicos, diluido com agua, tendo como substrato areia lavada. O efluente nao diluido e diluido em agua a 50% provocou a morte de todas as plantas em apenas duas semanas de irrigacao. As plantas irrigadas com o efluente a 25% sobreviveram as 06 semanas de tratamento, apresentando diminuicao do crescimento. O efluente na concentracao de 12,5% promoveu o crescimento das plantas nas 06 semanas de irrigacao. Ao final do experimento, concluiu-se que, apesar do efeito toxico do efluente na planta, evidenciou-se tambem sua riqueza em nutrientes essenciais. A b s t r a c t Aquatic macrophytes are often used as self-purifiers in the treatment of effluent with a high organic load in wetland systems. However, a study of the tolerance of these plants to the type of effluent used should be conducted in advance. The main aim of the present study was to assess the tolerance of a macrophyte to effluent from an anaerobic digester of solid organic waste. In order to do so, wetlands were created on a bench scale and vegetated with the macrophyte Taboa ( Typha domingensis ). The plants were then irrigated with effluent from a biodigester of solid organic waste, diluted with water, using washed sand as substrate. The non-diluted effluent and the effluent diluted with 50% water caused the death of all of the plants in just two weeks of irrigation. The plants irrigated with effluent at 25% survived the six weeks of treatment, exhibiting a decrease in growth. Effluent at a concentration of 12.5% promoted the growth of the plants in the six weeks of irrigation. At the end of the experiment, it was concluded that, despite the toxic effect of the effluent on the plants, there was evidence of its richness in essential nutrients. Keywords : Toxixity, Typha domingensis , High organic load effluent.

Tolerância da Typha domingensis a Efluente de Alta Carga Orgânica (Tolerance of Typha domingensis to Effluent with a High Organic Load)