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Appl. Sci. 2020, 10, 8687 8 of 18 values of 45.98% and 42.05% at 20 and 15 L/h, respectively, all after 60 min, as shown in Figure 5b. At 400 rpm and 10 L/h, another maximum value of 50% was obtained after 60 min (Figure 5c), while at 550 rpm this value was the highest one recorded for the suspended solids removal—namely, 61.13% at 15 L/h after 50 min, as indicated by Figure 5d. The following working parameters of 850 rpm, at 25, 20, and 15 L/h, respectively, rendered reasonably high values for the suspended solids removal of 54.51%, 51.88%, and 45.53%, respectively, after 40, 50, and 55 min measuring time intervals, as presented in Figure 5e. At 1200 rpm, the best removal was obtained for 15 L/h and had a value of 52.14% after 60 min. The 1500 rpm rotational speed and the 15 L/h WW flowrate rendered a maximum removal value of 54.98%, followed by a sharp decrease with the operating time (Figure 5g). The other investigated flowrates did not provide promising data, thus they were not included graphically. Appl. Sci. 2020, 10, x FOR PEER REVIEW 9 of 19 Figure 5. Influence of the WW flowrate on the suspended solids removal at different disc rotational Figure 5. Influence of the WW flowrate on the suspended solids removal at different disc rotational speeds: (a) 100 rpm, (b) 250 rpm, (c) 400 rpm, (d) 550 rpm, (e) 850 rpm, (f) 1200 rpm, (g) 1500 rpm. speeds: (a) 100 rpm, (b) 250 rpm, (c) 400 rpm, (d) 550 rpm, (e) 850 rpm, (f) 1200 rpm, (g) 1500 rpm. Concluding the influence of the WW flowrate fed on the disc, one can state that the 15 L/h WW flowrate value was the most indicated to perform the highest removal in terms of two investigated quality indicators, for most of the rotational speeds of 100, 550, 850, 1200, and 1500 rpm. This flowrate of 15 L/h, correlated with a disc rotational speed of 550 rpm, rendered the highest removals for all studied quality indicators—i.e., color (53.50%) and suspended solids (61.13%)—within the flowrate and rotational speed investigated interval. Furthermore, these maximum values pertain to increasingPDF Image | Textile Wastewater Treatment on a Spinning Disc Reactor
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