ULTRAFILTRATION PERFORMANCE OF TUBULAR ME MBRANE MODULES FITTED WITH TURBULENT PROMOTER - TWISTED TAPE AND STATIC MIXER

The permeate flux of a membrane module fitted with a twisted tape or s tatic mixer was 4-7.7 times higher than that of a membrane module with out any turbulent promoter. Use of a twisted tape or static mixer shor tened separation time. The energy consumption per unit mass of permeat e due to pressure drop in the membrane module with twisted tape or sta tic mixer was 2 similar to 3 times higher than that in the membrane mo dule without turbulent promoter. The permeate flux solved by introduci ng the value of mass transfer coefficient into the osmotic pressure mo del coincided well with experimental results, where the mass transfer coefficient was obtained by simulating experimental formula of heat tr ansfer in a pipe fitted with a twisted tape or static mixer into a mas s transfer correlation by the heat transfer-mass transfer analogy. The mass transfer coefficient in a membrane module with twisted tape or s tatic mixer increased to about 4 to 8 times that of a membrane module without turbulent promoter.