ณัฐ ไชยอัชนรัตน์. Effect of Feed Velocity on Efficiency of Cassava Starch Separation Using Sieve Bend Screen. Master's Degree(Chemical Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library.. : King Mongkut's University of Technology Thonburi, 2009.
Effect of Feed Velocity on Efficiency of Cassava Starch Separation Using Sieve Bend Screen
Abstract:
In cassava starch production process, coarse and fine extractors are normally used in
order to extract cassava starch from pulp. The goal of this research is to consider a
new alternative, a sieve bend screen, to replace a fine extracting unit (i.e., conical
rotating screen extractors). The advantages of the sieve bend screen are no moving
parts, self cleaning, low maintenance, low energy consumption, and a wide range of
application. However, the disadvantages of the sieve bend are easy clogging and
abrasion. In this research, a lab-scale sieve bend screen machines were designed and
constructed to investigate the effect of feed velocity of cassava starch slurry on the
separation efficiency and capacity. Experiments were conducted with one and two
nozzles. Inlet velocities were varied at 0.65, 1.16, 2.61, and 10.44 mls for one
nozzle, and at 0.33, 0.58, 1.31, and 5.22 mls for two nozzles. Experimental results
showed that as the feed velocity increased, cassava starch at undersize increased due
to the reduction of cake formation on the sieve bend screen. Moreover, the amount of
cassava starch loss with oversize gradually decreased. The optimum condition for
separating cassava starch from fine pulp for the sieve bend screen with 120 screen
arc was 2.61 and 1.31 mls feed velocity for one and two nozzles, respectively.