Chapter_8_-_Gravity_Sedimentation_Processes

Chapter_8_-_Gravity_Sedimentation_Processes - Chapter 8...

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Chapter 8 Gravity Sedimentation Processes Instructor: Dr. Rami Jumah Department of Chemical Engineering Jordan University of Science and Technology
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JUST Department of Chemical Engineering Ch E 362 Unit Operations Chapter 8- 2 Batch Settling Test t = 0 t = 1 t = 2
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JUST Department of Chemical Engineering Ch E 362 Unit Operations Chapter 8- 3
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JUST Department of Chemical Engineering Ch E 362 Unit Operations Chapter 8- 4 Gravity Settling Tank u liq u t Residence time: Settling time: s r t V AH t Q Q H t u t Q A u s r t t  Area, A Q
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JUST Department of Chemical Engineering Ch E 362 Unit Operations Chapter 8- 5 Example: Particles: D P = 1 mm, P = 1200 kg/m 3 Liquid: Q = 0.3 m 3 /s, = 1000 kg/m 3 , = 0.001 Pa.s Calculate area of the gravity settling tank 2 2 p p t g D 9.81 1200 1000 0.001 u 0.109 m/s 18 18 0.001   Solution: 2 0.3 2.75 m 0.109 t Q A u
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JUST Department of Chemical Engineering Ch E 362 Unit Operations Chapter 8-2 Gravity Settlers Clarifiers Classifiers Gravity Classifiers Sorting Classifiers Sink-and-Float Method Differential Settling Method Gravity Sedimentation Processes
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JUST Department of Chemical Engineering Ch E 362 Unit Operations Chapter 8-3 Gravity Settlers: I. Clarifiers II. Classifiers Industrial Sedimentation Units I. Clarifiers: Settlers that remove particles from a fluid under hindered settling conditions The objective is to convert a dilute slurry of fine particles into a clarified liquid and a concentrated suspension The process is carried out in large open tanks called thickeners or clarifiers .
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JUST Department of Chemical Engineering Ch E 362 Unit Operations Chapter 8-4 II. Classifiers: Devices that separate the solids into two or more fractions: (a) Gravity classifiers (b) Sorting classifiers Separate particles on the basis of size, in situations in which the density of the fine particles is the same as that of the larger ones (a) Gravity classifiers:
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