Publication: Removal of iron and manganese from groundwater using cascade aerator and limestone roughing filtration
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Date
2021-07-01
Authors
Md Razif, Muhammad Faiz Syazwan
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Abstract
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 flow rate for both cascade aerator was 22 ml/s. Model B (865 mm) with higher in height has higher dissolved oxygen and aeration efficiency compared to model A (727 mm). The highest removal of iron and manganese for Model B are 45.2% and 21.68% respectively. Three different sizes of limestone were filled into horizontal roughing filter 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 0.425 mm – 2.35 mm with removal of 82.75% for iron and 56.78% for manganese. The highest removal for iron was 89.69% while for manganese was 66.15%.