Project ForgeMass Transfer
Mass Transfer Operations
GATE 2015
Medium
Activated carbon adsorption reduces phenol from 0.04 to 0.008 mol/L. Isotherm: q=0.025C^(1/3) (mol/g). The minimum solid (g) required per liter of wastewater, rounded to 1 decimal place, is
6.4 g(± 0.1 accepted)
Explanation
At minimum solid, operate at equilibrium with final C: q_final=0.025×(0.008)^(1/3)=0.025×0.2=0.005 mol/g. S=(0.04−0.008)/0.005=6.4g.
Source: GATE CH 2015 (2015)
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