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Appl. Sci. 2020, 10, 8687 14 of 18 The calculated values of the Fisher test were Fc (Y1) = 40.560 for Y1 and Fc (Y2) = 2.086 for Y2, and related to Fstatistic_table = 6.59, from which one can conclude that all three tested independent variables (X1, X2, X3) had a significant importance with respect to the suspended solids removal (Y1) from the textile WW, and two independent variables (X2 and X3) had no importance regarding the WW discoloration. Exp. No. Z1 1 14 2 26 3 14 4 26 5 14 6 26 7 14 8 26 9 10 10 30 11 20 12 20 13 20 14 20 15 20 16 20 17 20 18 20 19 20 20 20 Z2 Z3 150 10 150 10 450 10 450 10 150 20 150 20 450 20 450 20 300 15 300 15 102 15 550 15 300 7 300 24 300 15 300 15 300 15 300 15 300 15 300 15 X1 X2 X3 −1 −1 −1 1 −1 −1 −1 1 −1 1 1 −1 −1 −1 1 1 −1 1 −1 1 1 1 1 1 −1.682 0 0 +1.682 0 0 0 −1.682 0 0 +1.682 0 0 0 −1.682 0 0 +1.682 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Y2e Y2 [%] [%] 18.244 19.165 20.058 16.395 19.804 19.165 17.954 16.395 19.333 19.165 20.711 16.395 19.260 19.165 17.737 16.395 25.644 22.630 14.509 17.971 18.462 16.402 15.524 16.402 19.042 16.402 18.498 16.402 18.752 16.402 18.027 16.402 15.270 16.402 13.819 16.402 15.597 16.402 17.048 16.402 Deviation (A) A = (Y2e − Y2) × 100/Y1e [%] −5.047 18.263 3.228 8.684 0.870 0.164 0.494 7.567 11.754 −23.859 11.159 −5.654 13.865 11.332 12.533 9.015 −7.412 −18.690 −5.160 3.790 Table 5. Experimental planning matrix for Y2 (discoloration degree). Figure 8(a,a1)–(c,c1) and Figure 9a–c illustrate the dependence of the WW suspended solids removal (Y1) vs. two independent variables (one variable was kept at the basic value) (i.e.,Y1 = Y1(X1,X2,0); Y1 = Y1(X1,0,X3), and Y1 = Y1(0,X2,X3) with their isolines) and one independent variable (two variables were maintained at their basic values). Figure 9d illustrates the dependence of textile WW discoloration (Y2) on one significant independent variable (X1) (X2 and X3 are constant, at their basic value and not influencing theY2 value). The variation in the suspended solids removal (Y1) with the increase inthe WW flowrate (X1) is obvious in Figure 9a. One can observe a minimum of suspended solids removal (Y1 = 35.467%) for X1* = 0.6984 and a local maximum (Y1 = 44.351%) for a WW flowrate of 24.19 L/h, a rotational speed of 300 rpm, and a working time interval of 15 min. The dependence of the suspended solids removal (Y1) on the rotational speed (X2) indicates a constant value (Y1 = 36.190%) for all X2* values (Figure 9b). The variation inY1 with an increase in the working time (X3) indicates a minimum removal (Y1 = 36.777%) for X3* = +0.2659 (a local minimum for a flowrate of 20 L/h, a rotational speed of 300 rpm, and an operating time of 16.33 min (Figure 9c). One can observe the existence of a minimum discoloration degree (Y2 = 16.054%) for X1* = 0.5025 and also of a local maximum (Y2 = 23.046%) for X1* = −1.75 in the investigated experimental field.PDF Image | Textile Wastewater Treatment on a Spinning Disc Reactor
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