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Appl. Sci. 2020, 10, 8687 5 of 18 5–10 FTU), total organics content (more than 3–5 timefolds for COD, or 12 timefolds for BOD), and fixed reAspidpl.uSecsi.2(0m20o,1r0e,xthFaOnRP3E–E4RtRimEVeIEsWfolds),thereforetheWWtreatmentisobviouslynecessary.5Inofa1n9y wastewater treatment process, one first step is the separation of settable and course or even fine treatment process, one first step is the separation of settable and course or even fine particulated particulated solids to obtain a WW load reduction and to provide the easy operation of the following solids to obtain a WW load reduction and to provide the easy operation of the following steps used steps used for dissolved contaminants’ removal/elimination. Thus, the main WW quality indicators for dissolved contaminants’ removal/elimination. Thus, the main WW quality indicators evaluated evaluated to underline the SD technology performance are the color and solids content (as suspended to underline the SD technology performance are the color and solids content (as suspended solids solids and colloids), without any chemicals used for the chemical treatments or activated sludge used and colloids), without any chemicals used for the chemical treatments or activated sludge used for for biological treatment. biological treatment. ◦ All our series of experiments were performed at the laboratory room temperature (20 ± 1 C), All our series of experiments were performed at the laboratory room temperature (20 ± 1 °C), working with no pH adjustment at the collected textile wastewater pH (7.12–7.89). working with no pH adjustment at the collected textile wastewater pH (7.12–7.89). 3.1. Textile WW Treatment Performance Using SD Technology Laboratory Setup 3.1. Textile WW Treatment Performance Using SD Technology Laboratory Setup To investigate the efficiency of the SD technology in WW treatment, the textile effluent quality To investigate the efficiency of the SD technology in WW treatment, the textile effluent quality indicators were measured at different feeding WW flowrates—namely, 10, 15, 20, 25, and 30 L/h—and indicators were measured at different feeding WW flowrates—namely, 10, 15, 20, 25, and 30 L/h— different disc rotational speeds—specifically 100, 250, 400, 550, 850, 1200, and 1500 rpm. and different disc rotational speeds—specifically 100, 250, 400, 550, 850, 1200, and 1500 rpm. Some values of the measured textile WW quality indicators—i.e., color (A456); suspended solids Some values of the measured textile WW quality indicators—i.e., color (A456); suspended solids (SS); absorbance at 525 nm (A525) and 620 nm (A620)- at three different disc rotational speed values of (SS); absorbance at 525 nm (A525) and 620 nm (A620)‐ at three different disc rotational speed values of 100, 300, and 500 rpm, all at the same WW flowrate of 10 L/h—are represented in Figure 2a–c. All the 100, 300, and 500 rpm, all at the same WW flowrate of 10 L/h—are represented in Figure 2a–c. All the graphs indicate decreasing trends, larger or smaller, depending on the rotational speed of the disc that graphs indicate decreasing trends, larger or smaller, depending on the rotational speed of the disc Figure 2. Variation in the time of the textile WW suspended solids (MS) and colour at 10 L/h flowrate Figure 2. Variation in the time of the textile WW suspended solids (MS) and colour at 10 L/h flowrate and three different rotational speeds: (a) 100 rpm, (b) 300 rpm, (c) 500 rpm. and three different rotational speeds: (a) 100 rpm, (b) 300 rpm, (c) 500 rpm. demonstrates the spinning disc technology’s effectiveness. that demonstrates the spinning disc technology’s effectiveness. Additionally, the same variation in the time of quality indicators at a WW flowrate of 30 L/h at Additionally, the same variation in the time of quality indicators at a WW flowrate of 30 L/h at three different disc rotational speeds of 100, 300, and 500 rpm presented in Figure 3a–c indicates three different disc rotational speeds of 100, 300, and 500 rpm presented in Figure 3a–c indicates similar similar decreasing trends. decreasing trends. Based on the variation in time of the WW quality indicators, the removal efficiency, calculated Based on the variation in time of the WW quality indicators, the removal efficiency, calculated using using Equation (1), has been determined and graphically represented to establish, on the one hand, Equation (1), has been determined and graphically represented to establish, on the one hand, the most the most advantageous working parameters—namely, the WW flowrate and the disc rotational advantageous working parameters—namely, the WW flowrate and the disc rotational speed—for speed—for which the maximum removal values are performed and, on the other hand, to prove the which the maximum removal values are performed and, on the other hand, to prove the efficiency of efficiency of the SD technology. Following the influence of the WW flowrate at constant disc rotational speeds and also the influence of the disc rotational speed at constant WW flowrates on thePDF Image | Textile Wastewater Treatment on a Spinning Disc Reactor
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