Removal of Ammoniacal Nitrogen (NH3N) and Chemical Oxygen Demand (COD) from Primary Effluent of CETP by Physico-Chemical Method
Disposal of industrial waste in large quantities was not in accordance with today’s standards of waste into environmental issues that must be overcome with proper treatment. At presently majority of Common Effluent Treatment Plant (CETP) in India are not discharging their treated waste water as per CPCB discharge norms, result in increase in pollution load on receiving bodies. The removal of Ammoniacal Nitrogen (NH3N) from waste water has become a world-wide emerging concern because it is toxic to aquatic species and cause eutrophication in Natural Environment. The study discuses the role of strong oxidant like Sodium Hypochlorite (NaOCl) and strong adsorbent like Activated Carbon, on Primary Effluent of CETP, Vapi, Gujarat, India. Strong Oxidant and Adsorbent were studied for reducing the NH3Nand CODwith different concentration with time variation at different pH. The result shows that 1000 ppm Sodium Hypochlorite at pH;10 with two-hour aeration time gives 68.34% reduction of Ammoniacal Nitrogen and 54% reduction of COD. The effect of adsorbent dosages (0.5-1.5 gram/l), on Ammoniacal Nitrogen concentration (70-106.4 mg/l), COD concentration (800-1248 mg/l),pH; (3 to 9) and contact time (30 -120 min) were examined. The reduction in NH3Nand CODat pH; 9 for two-hour Aeration was 74% and 54% respectively.
Keywords - Common Effluent Treatment Plant (CETP), Ammoniacal Nitrogen and COD Reduction, Strong Oxidant (NaOCl), Adsorbent Activated Carbon.