Published Paper Details:

Treatment of greywater for reuse has attained importance in the recent years, asits reuse can be a cost-effective alternative source for water. Many treatment systems were studied and optimized considering the minimum energy requirement and operational feasibility. Present study mostly focused on the optimization of process parameters. In the coagulation-flocculation process, the coagulant and flocculant dose were optimized with RSM and combination of the doses were applied (9 mg/l alum + 0.8 mg/l PE). The agitation rate of mixing was also optimized (18 RPM for slow mixing and 140 RPM for fast mixing). Sedimentation time was optimized and the optimum time found as 70 minutes. The dual media filtration with sand and GAC were optimized keeping the consideration of cost and efficiency, the GAC to sand depth ratio, initial COD concentration and flow rate was optimized using RSM (RSM suggest a GAC: sand =0.6). The treatment of real greywater was performed and the parameters measured were, COD and MBAS. Column study was carried out at optimized influencing parameters. The COD removal efficiency at flow rate 4 ml/min (0.76 m3/m2/h), 8 ml/min (1.52 m3/m2/h) and 12 ml/min (2.28 m3/m2/h) was observed as 75.73%, 69.90% and 62.14% after 1 h and 43.69%, 9.71% and 4.85% after 24 h, respectively. The MBAS removal at the same flow rate was observed as 93.81%, 81.50% and 76.92% after 1 h and 32.85%, 17.39% and 6.35% after 24 h, respectively.