Fitotoxicidade de efluente da indústria cervejeira em sementes de Lactuca sativa L.

The effluent generated in the beverage industry is rich in organic load, requiring a high degree of treatment of the process water, before returning it to nature. In this context, the main objective of this study is to verify was to evaluate the phytotoxicity of effluent from the beverage industry by root elongation and seed germination of Lactuca sativa L. (lettuce) as well as the correlation of these variables with the Color and COD of the raw and treated effluent. The seed germination and root elongation of 540 lettuce seeds divided into 4 concentrations, one positive control and one negative control, each of which was represented by 3 Petri dishes (replicates) with 15 seeds in each plate were evaluated. The seeds were incubated in the absence of light at a constant temperature of 22 ± 2 ° C for 120 hours. At the end of the exposure period, the results showed that there was no statistical difference between the EC50 root growth and the germination index of the treated and treated effluent and the root elongation index showed significant inhibition according to the method for both the effluent Treated as for the brute. Since the percentage of germination and root growth showed a significant correlation with color and COD, it is possible to conclude the treatment inefficiency of the treatment by advanced oxidative process in the studied effluent. [ABSTRACT FROM AUTHOR]