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The herculean imprecation of nitrogen-based pollutant like Ammoniacal Nitrogen (AN) and Chemical Oxygen Demand (COD) on aquatic milieu is now a concern for the Dye, pharma and fertiliser industries. Wastewater from these is characterised with high concentration of AN, COD and Total Dissolved Solids (TDS), treatment of which is of utmost importance for cleaner environment. In the current research work, an attempt was made to apply integrated Electro-coagulation (EC) – Sonication process for the removal of COD and AN from highly acidic dye intermediate wastewater containing high to very high concentration of COD and AN. Systematic laboratory experiments were conducted for the treatment of dye intermediate wastewater and influences of pH (5–11), applied voltage (0.5–4V) and electrolysis time (30–120 minutes) were investigated.