Open AccessRemoving Iron and Manganese by Using Cascade Aerator and Limestone Horizontal Roughing Filters
Author(s) -
M. F. Syazwan,
M.A.Z. Mohd Remy Rozainy,
Rhahimi Jamil
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/864/1/012006
Subject(s) - manganese , aeration , filtration (mathematics) , chemistry , adsorption , cascade , environmental engineering , metallurgy , groundwater , environmental science , environmental chemistry , geology , materials science , chromatography , geotechnical engineering , mathematics , statistics , organic chemistry
The quality of groundwater at Rumah Nur Kasih consist high concentration of iron (6.12 mg/L) and manganese (0.56 mg/L). The groundwater only used for external usage such as cleaning purposes. In order to reduce iron and manganese, it is proposed cascade aerator system for oxidation process and horizontal roughing filter using limestone as the media for further removal. The oxidation process can reduce iron and manganese in water by increasing the dissolved oxygen. Meanwhile, the filtration by various size of the limestone can help to reduce the concentration of heavy metals as these limestones able to adsorp heavy metals into theirs surface. In this study, two lab scale cascade aerators with different in height of cascade were used to find the highest removal of iron and manganese. It was found out that the optimum flowrate for both cascade aerator was 22mL/s. Model B with higher in height has higher dissolved oxygen and aeration efficiency. The highest removal of iron and manganese for model B are 45.2% and 21.68% respectively. The highest removal of iron and manganese for model A are 39.95% and 12.09% respectively. Three different sizes of limestone were filled into horizontal bed filtration for further removal. The adsorption of these limestone was observed and the smallest range of the limestone has the highest removal for both iron and manganese. The optimum sizes of the limestone are 0.425mm – 2.35mm with removal of 82.75% for iron and 56.78% for manganese.