Sunset　yellow　(SY)　FCF　is　a　hazardous　azo　dye　pollutant　found　in　food　processing　effluents.　This　study　investigates　the　use　of　inactivated　aerobic　granular　sludge　(AGS)　as　a　potential　adsorbent　for　the　removal　of　SY　from　water.　Adsorption　studies　were　carried　out　at　varying　pH　values,　dosages　of　adsorbent,　initial　dye　concentrations,　and　temperatures.　Optimal　adsorption　conditions　were　identified　at　pH　2.0,　adsorbent　dosage　of　2.0　g　L-1,　contact　time　under　120　min,　and　35　degrees　C　temperature.　Equilibrium　data　of　the　adsorption　process　fitted　very　well　to　the　Freundlich　model　(R-2　＞　0.99).　Kinetics　results　showed　that　the　experimental　data　fitted　well　to　the　pseudo-second-order　model　(R-2　＞　0.99).　The　thermodynamic　parameters　such　as　enthalpy　change　(Delta　H　degrees),　entropy　change　(Delta　S　degrees),　and　Gibbs　free　energy　(Delta　G　degrees)　were　calculated.　Thermodynamic　testing　demonstrated　that　the　adsorption　of　SY　was　a　spontaneous　and　endothermic　process.　Fourier　transform　infrared　spectroscopy　indicated　that　functional　groups　played　an　important　role　during　the　adsorption　of　SY.　These　results　confirm　that　AGS　can　be　used　as　an　adsorbent　for　successful　removal　of　SY　dye　from　wastewater.