ABSTRACT
Removal of toxic metals (iron and manganese) ions from aqueous solution by adsorption was studied. Batch tests were used to study the removal of each metal either as a single component or both metals as multicomponent. The adsorbents used are low cost materials namely; palm fruit bunch and maize cobs. The adsorption isotherms proved the favor ability of the adsorbent used. Removal of iron ion by adsorption on palm fruit bunch and maize cobs was in the range of 80-57%, and for magnesium ion in the range of 79-50% for initial concentration ranged between 1 and 10 ppm. In case of mixture of both metals, removal of iron from the mixture was in the range 79-54% and for magnesium was in range of 76-54%.
Subject(s)
Iron/chemistry , Iron/isolation & purification , Manganese/chemistry , Manganese/isolation & purification , Water Purification/methods , Adsorption , Biodegradation, Environmental , Cost Control , Fruit , Temperature , Zea maysABSTRACT
Tannery effluent is characterized not only by heavy loads but also with toxic heavy metals especially chromium ions. Chromium is considered an important source of contamination due to large volume of exhaust liquid discharged and solid sludge produced. Details on adsorption studies were carried out using synthetic chromium salts (chromium chloride) as adsorbate, and cement kiln dust (a waste from white cement industry) as adsorbent. Equilibrium isotherms have been determined for the adsorption of chromium ions on cement kiln dust. Kinetic study provided that the adsorption process is diffusion controlled. The experimental results have been fitted using Freundlich, Langmuir, and Redlich Peterson isotherms. The maximum adsorption capacity of cement kiln dust was found to be 33 mg/g. Industrial tannery effluent (22-mg/L chromium and COD 952 mg/L) was also treated by cement dust. The treated effluent (using 20 g cement dust per 1 L) contains only 0.6 mg/L chromium and COD 200 mg/L.
