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In this work, a comparative analysis of Fenton, Fe²⁺/NaOCl and Fe²⁺/(NH₄)₂S₂O₈ assisted advanced oxidation processes was carried out to study its efficacy in enhancing tannery chemical sludge dewaterability. Experimental results showed that, after conditioning of sludge at optimum pH, oxidant and catalyst dosage, capillary suction time (CST) was decreased by 75 ± 5 % and moisture content of sludge cake (M.C_cake) was reduced to 74 ± 2 % for all processes at 10 min reaction time. Among the three processes, Fe²⁺/(NH₄)₂S₂O₈ process was noted to have larger impact on the breakdown of sludge cells, which is reflected in terms of its highest amount of total organic carbon, protein and total dissolved solids present in the separated sludge fractions. In addition, Fe²⁺/(NH₄)₂S₂O₈ process was also observed to leach out largest fraction say 73.3 % of chromium present in the raw sludge into the treated sludge …