The aim of this study was to see the effectiveness of aeration in decreased levels of iron (Fe) in water wells before and after the aeration process using multiple tray aerator methods. The use of multiple tray aeration is expected to reduce the levels of iron (Fe) in water wells. This research is an experiment with 30 samples of good water that had higher levels of iron (Fe), which do not qualify as water obtained by non-random sampling in Gowa Regency. To find out the effectiveness decreased levels of iron (Fe) before and after aeration performed with SPSS statistical testing. The results obtained show the rate of decline in levels of iron (Fe) average about 2.21 mg/L with an average percentage of 68.01% decline. Value levels of iron (Fe) on average after aeration obtained at 1.12 mg/L. Although it has seen a decline the effective look at the results showed significant before and after the aeration is done but not yet clean water requirements with value levels of iron (Fe) up to 1.00. In contrast to the results of another study that the results of decreased levels of iron (Fe) obtained only around 0.20 mg/L or simply a decline of about 10%. The difference in the results achieved by the research conducted in the laboratory with a reduction of circulating air in the rooms was not big. To achieve the levels of iron (Fe) to fit the requirements it is necessary to further processing after aeration. Aeration method with multiple tray aerator can reduce levels of iron (Fe) in water wells significantly but the results are not yet qualified to clean water.
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