Abstract
To reduce fouling, enhance turbulence and permeate flux in membrane filtrations, similar to the rotating disk membrane modules, in this paper, a new helical membrane was rotated and its features in filtrating different particle suspensions such as yeast, kaolin and CaCO3 in a cylindrical container were studied. About 27% enhancement of stable flux can be maintained by rotating a 360° helical membrane, comparing with rotating a same sized flat membrane, at a rotating speed of 160rpm. The flux enhancement and fouling reduction were affected by the helical angles (best at 360°) of the membrane module, the enhancement in turbulence intensity and the hydraulic flow regime and dimensions, such as the ratio of the membrane width to the diameter of the separation unit. The stable permeate flux of rotating a 360° helical membrane were higher than that of rotating a flat membrane both at 5.3kPa or 6.5kPa, a higher flux enhancement at 6.5kPa was observed. The order of membrane fouling was yeast>kaolin>nano-CaCO3 when the particles concentrations were all at 5.0gl−1. Fouling is less severe when the diameter of separation units is smaller, and vice versa. Rotating a helical membrane is specifically useful for stirring separations without aeration.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
