). Em adição, verificou-se que o processo de EC também é eficaz para a redução de cor, turbidez, sólidos suspensos totais, sulfato e sulfeto. A concentração de íons cloreto não foi alterada durante a EC, apresentando-se como um aspecto favorável para a reutilização do efluente tratado no próprio processo produtivo têxtil, o qual demanda uma elevada concentração de NaCl.Palavras-chave: eletrocoagulação; efluente têxtil; corrente contínua pulsada; Box-Behnken; remoção de demanda química de oxigênio. ). In addition, it was found that the EC process is also effective for reduction of color, turbidity, total suspended solids, sulfate and sulfide. The concentration of chloride ions was not modified during the EC, presenting itself as a favorable aspect for the reuse of treated wastewater in the textile production process itself, which demands a high concentration of NaCl.

Textile effluents are complex, making it difficult to choose an effective treatment. The textile effluent toxicity in Lactuca sativa after pulsed current (PC) electrocoagulation (EC) was evaluated in this study. The EC was performed using 304 stainless steel electrodes in batch mode. Parameters monitored included pH, temperature, color, and turbidity. Additionally, the process residue was subjected to energy-dispersive X-ray fluorescence (XFR) to determine the elements present. The process achieved proportional color and turbidity removal ranging from 97 to 99% and from 74 to 85%, respectively. Chemical oxygen demand (COD) and total nitrogen removal were 81 and 49%, respectively, in a 50 min time-lapse. The process generated approximately 1.7 kg of solid residue/m3 treated effluent. The XFR results revealed the presence, mainly, of Fe, Cr, and Ni ions in the residue, as well as chlorine. The germination index (GI) and relative growth values showed that EC reduced effluent toxicity slightly, indicating the need for complementary treatment.