APPARATUS AND METHOD FOR MEASURING BULK FLOW POTENTIAL FOR QUANTITATIVE CALCULATION OF ELECTROKINETIC CHARACTERISTIC VALUE OF HOLLOW FIBER MEMBRANE

摘要

PURPOSE: An apparatus and method is provided to measure, in an accurate and quantitative manner, the very fine differences of flow potential for pores of a hollow fiber membrane. CONSTITUTION: An apparatus comprises a thermostatic feed tank(11) containing electrolyte solution; a unit including a conductance meter(12a) and a pH meter(12b) for measurement of physical properties of the solution contained in the thermostat feed tank; a pump(13) for transferring the solution from the thermostat feed tank to a membrane module; the membrane module including a hollow fiber membrane(21), an internal electrode(22) penetrating through the hollow fiber membrane, an external electrode(23) mounted in the vicinity of the hollow fiber membrane, and a connection portion(24) for connecting the main body of the membrane module and an electrolyte solution channel; a unit for measuring and controlling pressure difference between the interior and exterior of the hollow fiber membrane; a unit(40) for measuring and recording flow potential difference generated from each electrode; and a computer(50) for calculating zeta potential and surface charge density from the physical properties, pressure difference and flow potential difference.