Studi Efektifitas Biosand Filter dalam Menurunkan Kadar Besi (Fe) dan Mangan (Mn) pada Air Tanah

Abstract

Ground water at Indonesian Islamic University integrated college is basically considered clean form the bacteriology perspective; however, the chemical substance contained in the ground is relatively very high. One of the soluble compounds which are important here is iron (Fe) and Manganese (Mn). In the underground water, the degree of iron (Fe) is higher than those in the surface. Although in a certain degree of concentration our body needs iron (Fe) and manganese (Mn), but in the high concentration those chemical substances can cause health problem in the human body. Therefore, there should be a management before underground water is used. One of the very simple alternatives which can be used is using Biosand Filter. The purpose of this biosandfilter is tofind out the biosandfilter affectivity degree in decreasing the amount of iron (Fe) and manganese (Mn) and to find out the most effective thickness so that it can be obtained the most optimum decrease of iron (Fe) and manganese(Mn). The biosand filter requires 10 days to produce the biofilm layer. The research uses biosandfilter reactor with the variety of medium's height is 40: 15: 15 cm, 50: 5: 5 cm and 60: 5: 5 cm. While the width of the reactor's surface is A =0.09 m², the sand layer medium's total height is h = 0.7 m, the speed of water flow is v=0.6 m/h, the capacity of water flow is Q = 0.054 m³/h. Basedfrom the laboratory analysis result, it can be revealed that biosand filter removes iron (Fe) for 50.01 -95.58% and manganese (Mn) for 36.73% ­98.33%. The decrease of iron (Fe) and Mn is caused by the presence of oxygen and the biological activity caused by bacteria.