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| STUDY ON COMPARABILITY OF DEAD-END FILTRATION AND GRAVITY SEDIMENTATION |
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Revised:June 23, 2003
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| DOI： |
| KeyWord:Gravity sedimentation,Dead-end filtration,Comparability |
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| Abstract: |
| According to the movement rules of the two phases of solid particles and liquid,the air-clear and clear-suspension interface in the characteristic of dead-end filtration and gravity sedimentation process,their comparability and related rules were studied for founding a mathematic equation to describe the two different processes.The experimentation includes gravity sedimentation,dead-end filtration with sedimentation and dead-end filtration without sedimentation.In the two processes,the relati ve movement between liquid and solid particles is always in the same direction above the sediment and cake.And the forces of solid particles suffered are similar.But in the sediment and cake,the liquid moves in different direction.So the shear stresses of particles suffered are in an opposite direction.The curves of clear-suspension interface height vs time in both processes accord with the same function:H=H_e+(H_0-H_e)e~-t/t_1.In dead-end filtration with sedimentation,the settling process of particles can be regarded as "gravity"settling,where the acceleration equals Cg(C>0). |
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