The Efficiency of Iron and Manganese Removal from Groundwater Using Tower Aeration

In this study Tower Aeration system performance for the removal of iron and manganese from groundwater sources have been studied. In this research, pilot column Aeration tower design, implementation and was established. This system made of PVC with a diameter and height 150cm &15cm which was filled with flexible pipe parts. The initial pH= 5 , 7 and 9 and the initial concentration of Fe and Mn 2, 3 and 4 mg / l of the output system, sampling was done. Sample uptake rate for iron and manganese than the wavelength 510 nm and 525 nm by Varian spectrophotometer model UV-120-02 was measured. The result showed that the highest and The lowest rate of iron removal by Tower Aeration System was obtained pH=9, initial concentration of iron 2 mg/l(85%) and pH=5, initial concentration of iron 4 mg/l(46%) respectively.also the highest and The lowest rate of manganese removal by Tower Aeration System was obtained pH=9, initial concentration of manganese 2 mg/l(82%) and pH=5, initial concentration of manganese 4 mg/l(40%) respectively. In general we can concluded that with increasing pH, Packed tower aeration system performance in the elimination iron and manganese at all of initial concentrations of iron and manganese input has increased. The main reason its, the increased amount OH in water and increase the formation of Sedimention of ferric hydroxide and manganese dioxide. Mahvi and Associates study showed that the two methods stepped aeration and droped, with increasing concentrations of iron and manganese input and initial pH, the elimination these two elements has increased.1,