Removal of Congo Red from Aqueous Solution by Circulating Fluidized Bed(CFB)

Abstract

In this study circulating fluidized bed was adopted to remove of Congo Red from wastewater
using Eichhornia crassipes as a adsorbent. Solution flow rate(6,12 and 18)l/hr, bed height(2,4 and 6) cm
and Congo Red initaial concentration (10,25 and 50)mg/l were examined in experiments to show their
effects on breakthrough curves and time required to reach the adsorbent to fully saturated curve. The mass
transfer coefficient "KL"decreased with decreasing the liquid flow rate. The minimum fluidization
velocities of bed found equal to 1.6, 2, 2.5 mm/s for heights of 2, 4,6 cm respectively. The increasing of
the bed height will increase the contact time of the solute in the bed, and these improve the solute removal
efficiency. the increasing in flow rate and initial concentration will increase the mass transfer rate.