<![CDATA[Peat water is a surface water source widely used by people in swampy and lowland areas, but it has poor quality characteristics such as high organic matter content, low pH, and dissolved metal levels such as iron that exceed the threshold. These conditions can cause health problems and reduce the quality of clean water so that effective treatment technology is needed. This study aims to analyze the effectiveness of ultrafiltration membranes made from chitosan from shrimp shell waste in rejecting iron (Fe) and organic substances in peat water, and to determine the effect of pressure on separation performance. This study is an experimental study using a membrane made by dissolving chitosan powder in 1% acetic acid until homogeneous, then molded and dried. The obtained membrane was applied to a dead-end filtration system with three variations of operating pressure (0.5 bar, 1 bar, and 1.5 bar). Peat water samples were tested for Fe and organic matter levels before and after filtration. The results showed that before treatment, the Fe concentration was 3.59 mg/L and organic matter 26.7%. Filtration at a pressure of 0.5 bar reduced Fe to 2.18 mg/L and organic matter to 17.8%. The optimal pressure of 1 bar resulted in the highest reduction with Fe content of 1.24 mg/L and organic matter of 12.4%, as well as the rejection percentage of Fe 65.46% and organic matter 53.56%. However, at a pressure of 1.5 bar, the efficiency decreased (Fe 56%, organic matter 44.20%) due to fouling and membrane compaction despite increased flux. The results of this study indicate that the chitosan membrane is effective in reducing peat water contaminants, with operating pressure affecting the separation efficiency.]]>
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