Which of the following statements is incorrect? Porous membrane contains fixed pores, in the range of 0.1-10 µm for microfiltration and 2- 100 µm for ultrafiltration. Porous membrane contains variable pores, in the range of 0.1-100 µm for microfiltration and 2- 100 µm for ultrafiltration. The main problem in microfiltration and ultrafiltration membrane is flux decline. Therefore, the choice of membrane material for such process is based on prevention of fouling and cleaning procedure after it is fouled. none of the above

1 pointWhich equation is used for the calculation of permeate flux in pore flow model? Gibbs Ficks Hagen Poiseuille Maxwell1 pointThe build-up of rejected solute molecules near the membrane surface is described as __________ phenomena Back Diffusion Concentration Polarization Membrane Resistance Cake Resistance1 pointThe resistance offered by gel layer in 'gel permeation model' is Hydraulic resistance Pneumatic resistance Transmembrane resistance All of these1 pointFor industrial applications, the ultrafiltration process offers the following advantages___________ No generation of wastewater. Can be installed quickly and easily. No solvent or other precipitating agents are required for the concentrating process. All of these1 pointUF is used to separate solutes of size ranging from____________. 5 kDa to 500 kDa. 100 kDa to 1000 kDa 500 kDa to 1000 kDa None of these1 pointWhat is/are a common mode of UF operations_________. Batch operation Diafiltration Both (a) and (b) None of these1 pointMF membranes are usually ________ where as UF membranes are _________. Symmetric and symmetric Symmetric and anisotropic Anisotropic and anisotropic None of these1 pointWhich of the following is/are the methods to reduce concentration polarisation? Use of frequent pressure pulses of the feed flow Removal of dynamic particles to permeate stream Use of direct-on-flow feed flow none of the above1 pointWhich of the following factors affecting UF performance during ultrafiltration? Transmembrane Flow Operating Pressure Operating Temperature all the above1 pointWhich of the following is/are the application of ultrafiltration process? Treatment of oily wastewater Recovery of electro-coat paint Concentration of latex emulsion all the above

Which of the following statement is incorrect? Nanofiltration can withstand very high or low pH environment Nanofiltration cannot withstand very high or low pH environment Nanofiltration membrane tend to have a slightly charged surface, with a negative charge at neutral pH both a and c

The largest pores in microfiltration membrane are filled with mercury, when the pressure becomes ________ Lowest Highest Zero Moderate

Which filter process allows water to pass through specific size pores?Group of answer choicesSediment filtersMembrane filtersReverse osmosis

For Nanofiltration membranes, the rejection of monovalent ions range between 0% and 50% 0% and 30% 60% and 70% none of the above