부산대학교 도서관

An experimental design was applied in analyzing the process variables (pH, adsorption temperature and time) and optimizing the removal efficiency of three major responses (turbidity, COD, color) from paint wastewater using eggshell wastes. The eggshell is a composite made of inorganic (calcite) and organic (protein-rich fibrous membrane) components. The regression analysis showed good fit of the experimental data to the second-order polynomial quadratic model with a coefficient of determination (R.sup.2) of 0.9980 and F-value of > 27. Validation of the quadratic model was verified by the good agreement between the experimental and the predicted values of responses. Desirability analysis showed that the optimum conditions for the removal of COD, color and turbidity are: adsorption temperature ~ 25°C; pH ~ 5; and adsorption period > 22 min. Experimental design strategies and physicochemical water quality measurements were analyzed for monitoring and optimizing removal processes. The essence of this work is the re-use of solid eggshell wastes as cost-effective and environmentally friendly adsorbents for removing suspended solids and dyes from paint wastewater.
Author(s): M. A. Abdel-Khalek [sup.1], M. K. Abdel Rahman [sup.1], A. A. Francis [sup.2] Author Affiliations: (1) Department of Minerals Technology, Central Metallurgical R & D Institute (CMRDI), , P. [...]