Treatment of Wastewater by Cement Kiln Dust
The use of cement kiln dust (CKD) as an inexpensive, abundant adsorbent for removing Cr+3 from simulated wastewater was investigated. CKD was obtained from Al-Kufa Cement Factory in Al-Najif Government.Experiments for adsorption/precipitation mechanism for Cr+3 were performed. The results show that substantial adsorption occur at pH values less than 4 for Cr+3. A set of isothermal batch experiments were conducted in order to investigate the performance of CKD towered the adsorption of the Cr+3 ion from the aqueous solution. The results show that the best conditions for Cr+3adsorption on CKD were 60 min, 200 rpm, 20 g/L CKD and pH value 4.
The adsorption isotherm curves show that the adsorption is of a favorable type. A good fitting was obtained between the adsorption isotherm Langmuir model and the Cr+3 experimental data. The maximum sorption capacity qm for Langmuir model equal to 28.5mg/g CKD for Cr+3.