Toxicidade do efluente de açaí em sementes de Brassica oleracea

Acai (Euterpe oleracea) is a native fruit from Amazon that, in addition to having high nutritional potential, has a prominent role in the commercial, economic and cultural sectors of the northern population of Brazil. During the processing of acai, a significant amount of effluents is generated, which destination is uncertain, mainly in smaller centers. The objective of this study is to evaluate the toxicity of the raw and diluted acai effluent using bioassays with cabbage (Brassica oleracea). The tests were carried out in a petri dish and germination chamber for 120 hours, in complete absence of light, at 24oC, with raw and diluted effluent in concentrations of 25%, 50% and 75%, in addition to the control treatment with water. The effluent diluted in 25% showed positive results for seed germination and root growth. However, the regression analysis indicated an inverse linear relationship and the toxicity increased as the acai effluent was more concentrated, which may be related to the organic and inorganic matter levels and the effluent acidity. These results indicate the need for acai beaters to dilute and / or treat the effluent before disposal in the receiving bodies and / or in the soil.