Optimum placement of thin-layer elements in a horizontal sedimentation tank purification of drinking water

Abstract Experimental studies of the effectiveness water distribution methods in a thin-layer sump were carried out on model and semi-industrial installations. When designing sedimentation tanks, it is usually recommended to take η = 0.03-0.07. According our data, when > 0.05, not possible ensure uniform operation all slots (holes), which worsens hydrodynamic conditions settling zone. Experiments have also established that double gratings with relative area holes 2n provide almost same flow as single gratings. In this case, experimental values β 1 2.6 2.7, respectively, i.e. differed by no more than 5%. With mind installing reflectors, sufficiently efficient can be accepted 0.06-0.1 instead 0.03-0.05 for grates, essential reduce risk clogging them improve reliability sewer tanks. The obtained dependences sufficient accuracy practice used calculate reflectors at η=2η1 , where η1 grating, well calculating partitions round (square) holes, taking into formulas b s r n .