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Appl. Sci. 2020, 10, 8687 9 of 18 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 increasing trends which indicates that even higher values may be obtained, given a longer working time period of the spinning disc. The experimental investigation time periods within this study were limited by the amount of available textile wastewater and laboratory reservoir capacity. 3.1.2. Disc Rotational Speed Influence on the Treatment Efficiency Using SD Laboratory Setup Appl. Sci. 2020, 10, x FOR PEER REVIEW 10 of 19 To establish the disc rotational speed influence on the SD technology efficiency, each variation of the spinning disc. The experimental investigation time periods within this study were limited by in time of the two investigated WW quality indicators were represented at constant WW flowrates. the amount of available textile wastewater and laboratory reservoir capacity. In Figure 6a–e, the discoloration was plotted at seven different disc rotational speeds and a constant 3.1.2. Disc Rotational Speed Influence on the Treatment Efficiency Using SD Laboratory Setup flowrate of 10, 15, 20, 25, and 30 L/h, respectively. A rotational speed of 100 rpm rendered a maximum To establish the disc rotational speed influence on the SD technology efficiency, each variation color removal of 45.21% for 10 L/h, after 50 min, as seen in Figure 6a. At 850 rpm, the maximum color in time of the two investigated WW quality indicators were represented at constant WW flowrates. removal was of 43.07% for 10 L/h, after 60 min (Figure 6a); 31.58% for 25 L/h, after 40 min (Figure 6d); In Figure 6a–e, the discoloration was plotted at seven different disc rotational speeds and a constant and, finally, 30.1fl8ow%raateto3f010L, 1/5h, 2,0a, 2f5t,earnd3030mL/hin, re(sFpiegctuivreely.6Aer)o.taAtiotn5a5l s0perepdmof 1a0n0 rdpm15renLd/ehre,dtha meahximghumest discoloration color removal of 45.21% for 10 L/h, after 50 min, as seen in Figure 6a. At 850 rpm, the maximum color was of 53.50% (Figure 6b), which is the highest obtained value out of all acquired data within this study, removal was of 43.07% for 10 L/h, after 60 min (Figure 6a); 31.58% for 25 L/h, after 40 min (Figure 6d); while at 400 rpmanad,nfidna2lly0, 3L0/.1h8%thaet 3l0aLr/gh,easfterc3o0lmorinr(eFimguorev6ae)l. Awta55s04rp6m.4a8n%d 1.5AL/sh,athne haidghdesitidoisncoalolroatbiosnervation, if a set was of 53.50% (Figure 6b), which is the highest obtained value out of all acquired data within this of indicators, for a certain WW flowrate and rotational speed have not been graphically represented, study, while at 400 rpm and 20 L/h the largest color removal was 46.48%. As an additional it means they did not indicate satisfactory results. observation, if a set of indicators, for a certain WW flowrate and rotational speed have not been graphically represented, it means they did not indicate satisfactory results. Figure 6. Influence of the disc rotational speed on discoloration at different WW flowrates: (a) 10 L/h, (b) 15 L/h, (c) 20 L/h, (d) 25 L/h, (e) 30 L/h.PDF Image | Textile Wastewater Treatment on a Spinning Disc Reactor
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