Adsorption treatment of coal washery effluent (CWE) for the removal of suspended and dissolved particle (SDP) by chrysophylum albidium seed shell

Chrysophylum albidium seed shell was utilized as an adsorbent for suspended and dissolved particle removal from coagulated coal washery effluent. Several parameters were investigated using batch mode and 2³ full factorial central composite designs (CCD) (for optimization purposes). There exist single generality in optimal values for acid treated shell (ASAA) and salt treated shell (ASAS) at pH 6.8, 30°C, 10g/L dose, 30 min equilibrium time and 1g adsorbent mass for batch mode and CCD, respectively. Equilibrium data sufficiently fit the Langmuir isotherm (R² > 0.99 and SSE (%) ≤ 0.093). Pseudo-second order kinetics provides best correlation (R² > 0.99 and SSE (%) < 0.1) with experimental data. Thermodynamics constants (ΔG°, ΔH° and ΔS°) were respectively evaluated as -122.190 KJ/mol, 69005.967 J/mol and 228.146 Jmol^-1K^-1 for ASAA and -1537.455 KJ/mol, 68008.026 J/mol and 229.523 Jmol^-1K^-1 for ASAS. The shell biomass promises high potential as an efficient adsorbent since the adsorption process was favorable, endothermic and spontaneous.