JFET_V11_N1_RP1 D. Krishna D.V. Padma Journal on Future Engineering and Technology 2230 – 7184 11 1 1 6 Central Composite Face Centered Design (CCD), Ragi Husk Powder, Chromium (VI), Adsorption Aim of the experiment is to find out the optimization of adsorption parameters such as initial chromium (VI) concentration (5-30 mg/l), pH (1-4), and adsorbent dosage (1-3 g/l) using Central Composite Design in response with surface methodology. A total of 19 experiments were conducted for the present investigation towards construction of empirical model. The optimum conditions for maximum removal of chromium from an aqueous solution of 20 mg/l were as follows: adsorbent dose (2.26806 g/l), pH (1.76296) and initial chromium concentration (24.99465 mg/l). The maximum percentage removal of chromium at an optimum adsorption parameter is 70.53756%. This method is used to find out the mathematical model for the percentage removal of chromium metal ion from waste water efficiently. August - October 2015 Copyright © 2015 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3654