Wastewater Engineering Dr. Ali Jalil Chabuk Second Course - Lecture 4 Homework: Q1. Design rectangular settling tanks for the following conditions: 1- Served population = 2000000 person 2- Provide four rectangular basins: 3- Select surface overflow rate at average design flow = 40 m/m2. d (Table 9.1) %3D 4- Average design flow rate = 80000 m/s 5- Side water depth = 3.5m The design should be satisfying all design criteria. Q2. Two rectangular settling tanks are each 6 m wide (W), 24 m long (L), and 2.1 m deep (h). Each is used alternately to treat 1900 m' in a 12 h period. Compute the surface overflow (settling) rate, detention time, horizontal velocity, and outlet weir loading rate using a V-shaped weir with three times the width. Q3. A city must treat about 20000 m/d of wastewater with an overflow rate of 40 m/d. two circular basins use to produce satisfactory removal at a depth of 3.5 m. Determine the diameter required for settling basins, detention time, Surface overflow rate, and horizontal velocity.

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Asphalt Binders and Mixtures

Asphalt binders are subsidiary products procured during the refining process of petroleum while manufacturing gasoline, diesel, and similar petroleum products. Asphalt binders are obtained from the residue that remains after the distillation of petroleum, this residue is further subjected to steam distillation and oxidation to remove the traces of gas oil present in the residue. Certain additives or modifiers are also added to asphalt binders to alter them to suit different applications.