TY - JOUR N2 - In wastewater treatment plants, large pumps are often used to accommodate unknown hydraulic properties of solid-water mixture flow. The use of large pumps translates into higher purchasing and operating costs. Wastewater mixture is pumped with solids of different types and concentrations through pipelines. The design of these ducts is mainly based on the hydraulic laws of solid-water mixture which is represented by a corrected friction coefficient corresponding to the concentration of solids in water. This paper experimentally studies hydraulic properties of solid-water mixtures in pipelines by the varying Froude number (Fr), which represents the velocity mixture, solid concentration, pipeline diameter and pipeline material type-roughness coefficient. The experiments have been conducted in the wastewater treatment plant where six solid concentrations can be found ranging from 2 to 12% by weight. The pipe diameter ranges between 100 to 300 mm. It has been found that both the friction coefficient and the hydraulic gradient ameliorate with the increase of the pipeline roughness and the solids concentration in the water mixture, whereas the Fr drop with the diameter of the pipeline. The results are translated into curves and equations to predict the corrected pipeline friction coefficient and the hydraulic gradient of the solid-water mixture flow through horizontal pipelines at various solids concentrations, roughness and diameters. L1 - http://www.czasopisma.pan.pl/Content/120137/31%20Osra%20803.pdf L2 - http://www.czasopisma.pan.pl/Content/120137 PY - 2021 IS - No 49 EP - 272 DO - 10.24425/jwld.2021.137686 KW - deposit limit velocity KW - hydraulic gradient KW - hydraulic losses KW - slurry flow KW - solid concentrations KW - suspended solids KW - wastewater A1 - Osra, Faisal A. PB - Polish Academy of Sciences; Institute of Technology and Life Sciences - National Research Institute DA - 2021.07.01 T1 - Hydraulic gradient prediction for solid-water mixture flow through horizontal pipelines of different diameters and roughness and solids concentrations SP - 267 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/120137 T2 - Journal of Water and Land Development ER -