| Autor: |
Formentini-Schmitt DM; a Department of Chemical Engineering Postgraduate Program, State University of Western Paraná (UNIOESTE) , Toledo , PR , Brazil., Fagundes-Klen MR; a Department of Chemical Engineering Postgraduate Program, State University of Western Paraná (UNIOESTE) , Toledo , PR , Brazil., Veit MT; a Department of Chemical Engineering Postgraduate Program, State University of Western Paraná (UNIOESTE) , Toledo , PR , Brazil., Palácio SM; a Department of Chemical Engineering Postgraduate Program, State University of Western Paraná (UNIOESTE) , Toledo , PR , Brazil., Trigueros DEG; a Department of Chemical Engineering Postgraduate Program, State University of Western Paraná (UNIOESTE) , Toledo , PR , Brazil., Bergamasco R; b Department of Chemical Engineering, State University of Maringá (UEM) , Maringá , PR , Brazil., Mateus GAP; b Department of Chemical Engineering, State University of Maringá (UEM) , Maringá , PR , Brazil. |
| Abstrakt: |
In this work, the coagulation/flocculation/sedimentation treatment of dairy wastewater samples was investigated through serial factorial designs utilizing the saline extract obtained from Moringa oleifera (Moringa) as a coagulant. The sedimentation time (ST), pH, Moringa coagulant (MC) dose and concentration of CaCl 2 have been evaluated through the response surface methodology in order to obtain the ideal turbidity removal (TR) conditions. The empirical quadratic model, in conjunction with the desirability function, demonstrated that it is possible to obtain TRs of 98.35% using a coagulant dose, concentration of CaCl 2 and pH of 280 mg L -1 , 0.8 mol L -1 and 9, respectively. The saline extract from Moringa presented its best efficiency at an alkaline pH, which influenced the reduction of the ST to a value of 25 min. It was verified that the increase in the solubility of the proteins in the Moringa stimulated the reduction of the coagulant content in the reaction medium, and it is related to the use of calcium chloride as an extracting agent of these proteins. The MC proved to be an excellent alternative for the dairy wastewater treatment, compared to the traditional coagulants. |
