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Chapter 4 |
Filtration of liquidsPictures of filtration equipment Section 4.4: Compressible filtration constants - Filtration & Separation Equipment type selection - an expert system at Filtration & Separation Links - links Answers to problems: Q1: anthracite: outlet concentration is 24.4 ppm sand: outlet concentration is 2.6 ppm alumina: outlet concentration is 0.10 ppm The inlet concentrations are the outlet concentrations from the previous layers, and the final treated effluent is 0.10 ppm. Q2: i) the correct answer is (c), the concentration by mass must be converted to concentration by volume, see equation (3.16) for this. ii) the correct answer is (b), as the cake has a porosity of 50%; i.e. has equal volumes of solids and liquid. iii) the correct answer is (a), starting with 5000 ml of slurry and the cake contains 200 ml of solids and 200 ml of liquid - leavers just 4600 ml. iv) the correct answer is (a). v) the correct answer is (c). vi) the correct answer is (a). vii) the correct answer is (d). viii) the correct answer is (d), you need the integrated form of the general filtration equation under conditions of constant pressure - equation (4.19). Q3: i) the correct answer is (c), look at the equations in the box at the bottom of page 43. The total pressure rises due to increasing pressure required to maintain the flow through the cake, which is increasing in height. However, the pressure drop over the medium remains constant - for constant rate filtration. Now looking at the pressure rise equation, the constant pressure term is 6670 Pa. ii) the correct answer is (d), this requires some algebra and use of dV/dt is equal to V/t. You will also need to equate the rising pressure term in the filtration equation with 168t, and assume alpha, etc. are the same as in the previous question. iii) the correct answer is (d). iv) the correct answer is (d). Q4: i) the correct answer is (c). ii) the correct answer is (b). iii) the correct answer is (a). iv) the correct answer is (c) v) the correct answer is (a). Q5: See this file for a view of the spreadsheet. FAQ |

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