Exam KKKR3733

KKKR3733 e-Test 1 Sem II Answer ALL questions (50 marks) Question 1 a) Listed the differences between cross flow and dead-end filtration. (5 marks) b) Discuss the theoretical principles of plate and frame filter (PF Filter). (5 marks) c) Give 5 industry applications of this type of filter. (5 marks) d) Calculate the specific resistance of the cake (α) and the resistance of the filter medium (Rm) on the basis of the following experimental data (Table 1) for a constant pressure filtration of a suspension of incompressible solids of concentration 30 kg/m3 on a filter medium of area 1 m2 . The pressure drop was 2 bar. The viscosity of the filtrate (η) is 1.1 x 10-3 kg/m/s. Table 1 Experimental data Vol of filtrate V (m3 ) x 10-3 Time t(s) 2.0 4.0 6.0 8.0 10.0 23 60 114 184 270 Question 2 a) Bioflocculant is an extracellular polymeric bioproduct that is produced using sago mill effluent as a fermentation medium by Bacillus species under aerobic condition. By supporting with a block diagram, briefly explain how the bioflocculant and Bacillus biomass can be separated from the medium. (10 marks) b) Biomass of bacteria-producing bioflocculant (BPB) is separated through a laboratory centrifugation with a diameter of 15 cm and rotating at 1200 rev/min. The cells size and density of the BPB are 80 μm and 1.04 kg m-3 , respectively. i) Determine the axis of rotation if the liquid density, the residence time, and the liquid viscosity are 1.0 kg m-3 , 13.0 s, and 0.013 g cm-1s-1 , respectively. (5 marks) ii) Determine the flow rate of the centrifuge if its length is 40 cm. (5 marks) iii) Explain the factors that influence in scaling up of laboratory centrifugation for BPB biomass separation. (5 marks)