The adsorbent of present work proves its efficacy to be an
attractive alternative for treatment of phosphate from aqueous
solution. Beside this phosphate loaded adsorbent can be
used for biogas generation in an eco-friendly manner. Comparison
of adsorption capacity of adsorbents showed that
activated fruit juice residue can be considered as the efficient
adsorbent for treating phosphate rich wastewaters. The percentage
removal of phosphate for activated fruit juice residue
was found to be maximum at pH 6 and the optimum adsorbent
dose was 3 g/L. Adsorption kinetics obeyed a pseudo-first
order kinetic model. An increase in temperature decreased
the removal of phosphate by activated fruit juice residue.
Freundlich isotherm was found to represent the adsorption
equilibrium data well. The thermodynamic parameters indicate
thatthe adsorption of phosphate onto activated fruitjuice
residue is feasible and spontaneous. The experimental data
predict that the pore diffusion is not the sole rate-controlling
step. Film-diffusion was also found as the rate-controlling step
for phosphate adsorption from bulk ofthe liquid to the surface
of the adsorbent.