# Primary clarifier is to be designed for a municipal wastewater treatment plant with a flow of 416...

primary clarifier is to be designed for a municipal wastewater treatment plant with a flow of 4160 m/d and peak flow during the day of 3.10 times the average hourly flow. Pertinent data are: peak overflow rate 73.3 m/d.-m2, maximum peak weir loading 373 m3/d-m, and minimum tank depth 2.13 m. Determine: A. The clarifier diameter B. The side water deptlh C. The peak weir loading. Is it acceptable? D. The percent suspended solids removal on the basis of the average detention time if the influent suspended solids are 300 mg/
A trimedia filter has a 560-mm crushed anthracite coal layer (specific gravity 1.2), a 230-mm sand layer (specific gravity -2.65), and a 75-mm garnet layer (specific gravity 4.20). The average sizes of the particles in the three layers are 1.5 mm, 0.80 mm, and 0.30 mm, respectively. The shape factor for the particles is 0.9 and the porosities of the respective layers are 0.40, 0.45, and 0.50. The filtration rate is 3.40 /s- m2 and the water temperature is 10 °C. Determine the head loss for the clean filter. Note: Treat each layer as a bed of uniform particles using the Rose equation.

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