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In environmental engineering applications both types play vital roles; while ship propellers contribute towards pollution through wake vortices which stir up sediments from seabeds – an issue addressed through designs like contra-rotating screws – wastewater treatment plants utilize large-scale industrial mixers designed specifically remove pollutants effectively without causing secondary damage through excessive turbulence creation within tanks containing delicate microorganisms needed break down waste material naturally over time without harm being done either organisms themselves nor final treated water output quality standards set forth international bodies like WHO (World Health Organization).