Optimizing of heavy metals removal from car wash wastewater by chitosan-ceramic beads using response surface methodology

The current study aimed to optimize the heavy metals (Zn2+, Fe2+, Pb2+, Cu2+ and Cd2+) from the car wash wastewater by chitosan using response surface methodology (RSM), central composite design (CCD). The independent variables investigated in the present study included chitosan-ceramic beads dose (ranged from 1 to 3 g/L), shaking speed (between 100 and 150 rpm) and time (between 60 and 120 mins). The chitosan was prepared from the shrimp shells waste with ceramic wastes. The result revealed that the optimum parameters for heavy metal removal was recorded with 2.2 g/L of chitosan-ceramic beads, 123 rpm and after 90 mins, at which 50.41 vs. 54.74% of actual and predicted removal of Zn2+, 25.60 vs. 70% of Cu2+, 32.52 vs. 99.98% of Fe2+, 64.49 vs. 76.74% of Pb2+ and 75.77 vs. 62.24 of Cd2+ was recorded. These findings revealed the chitosan-ceramic exhibited an efficiency for heavy metal removal from the car wash wastewater. (c) 2019 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of the scientific committee of the 4th International Conference on Green Chemical Engineering and Technology: Materials Science.