Effective Treatment Methods of COD and TDS from Dyeing Industry Effluent

Though industries promote economy of the country, the pollution caused by them has to be controlled in order to save the environment from degradation. The present work has been aimed for the removal and reduction of chemical oxygen demand (COD) and total dissolved solids (TDS) of the dyeing industry effluent using oxidizing and coagulating agents, and adsorbent individually and in different combinations. About 0.25, 0.50, 0.75 and 1.00 g of oxidizing agent (sodium hypochlorite), coagulating agent (alum) and adsorbent (commercial activated carbon, CAC) were added separately and in combinations. The COD (92.3%) and TDS (80%) were removed using 0.25g of oxidizing agent within one hour, and with 1 g of coagulating agent the COD and TDS were removed 98.4 % and 90% respectively. For CAC it has been reported that the dosage of 0.75 g has resulted in 87.6 % and 80% of COD and TDS removal respectively. With the combination of sodium hypochlorite, CAC and alum, the percentage reduction of COD and TDS are 87% and 79% respectively. The statistical analysis revealed a positive correlation between reduction and the time.