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Abstrak :
Saringan pasir lambat merupakan salah satu metode pengolahan yang menjadi pilihan karena alat dan bahan yang mudah didapat, pengoperasiannya yang mudah, serta keefektifannya menyisihkan kontaminan dalam air yang baik. Untuk meningkatkan kehandalan penyisihan saringan pasir lambat, dapat dilakukan pengolahan pendahuluan salah satunya prasedimentasi. Tujuan dari penelitian ini adalah untuk membandingkan kehandalan saringan pasir lambat dengan proses prasedimentasi dan saringan pasir lambat tanpa prasedimentasi dalam menyisihkan besi, mangan, kekeruhan dan fekal koliform. Dibuat dua filter dari drum berkapasitas 150 liter dengan spesifikasi yang sama. Media filter direncanakan dengan spesifikasi yang sama, namun pada saat sieve analysis didapatkan untuk filter acuan, lapisan pasir 1 nilai ES = 0,2 mm dan UC = 3 & pada lapisan pasir 2 nilai ES = 0,45 dan UC = 2,2. Sedangkan filter I lapisan pasir 1 nilai ES = 0,15 mm, UC = 2,33 dan lapisan pasir 2 nilai ES = 0,4 mm dan UC = 1,88. Kedua filter dioperasikan secara intermittent dalam skala pilot. Sumber air baku yang dijadikan objek studi adalah air Danau Mahoni Universitas Indonesia karena tingkat pencemarannya yang berada di atas baku mutu air minum. Kehandalan filter acuan dengan perlakukan prasedimentasi untuk penyisihan besi sebesar 95%-97,94%, mangan 50-80%, kekeruhan 92,15-97,78 %, dan fekal koliform 90- 99,57%. Kehandalan efisiensi penyisihan filter I tanpa prasedimentasi untuk parameter besi tidak dapat disisihkan, mangan 50-93,33%, kekeruhan 50,28-94,26 %, dan fekal koliform 82,61-99,86%. ......Slow sand filter is one of the processing methods that is chosen because of easy-to-obtain tools and materials, easy to operate, and its effectiveness of removing contaminants in good water.To improve the reliability of slow sand filter removal, preliminary processing can be carried out, one of which is pre-sedimentation. The purpose of this study was to compare the reliability of slow sand filters with pre-sedimentation processes and slow sand filters without pre-sedimentation in removing iron, manganese, turbidity and faecal coliform. Two filters are created from a 150 liter drum with the same specifications. Media filters are planned with the same specifications, but when sieve analysis is obtained the results are: for reference filter, sand layer 1 ES value = 0.2 mm and UC = 3 & in sand layer 2 ES values = 0.45 and UC = 2.2 . While filter I sand layer 1 ES value = 0.15 mm, UC = 2.33 and sand coating 2 ES values = 0.4 mm and UC = 1.88. Both filters are operated intermittently on a pilot scale. The raw water source used as the object of study is the Lake Mahoni, University of Indonesia because of the level of pollution that is above the drinking water quality standard. Removal efficiency of reference filter with treatment of pre-sedimentation for iron removal was 95%-97.94%, manganese 50-80%, turbidity 92.15-97.78%, and faecal coliform 90-99.57%. The efficiency of filter I without prasedimentation for iron parameters cannot be excluded, manganese is 50-93.33%, turbidity 50.28 - 94.26%, and fecal coliform 82.61-99.86%.

Abstrak :
Water is one of the very necessary essence in human life aspects, which education is being one of them. As one of the best universities in Indonesia, University of Indonesia provides and find some ways to save clean water by minimizing the use amount of it, especially to reduce groundwater uses, as its noted in the UI GreenMetric purpose of clean water category. However, one of the faculties in UI, which is the Faculty of Nursing (FIK UI), have used a massive amount of groundwater in 2018 and 2019, with the amount number being 2.115.240 litres and 2.010.960 litres respectivel. FIK UI must find an alternative of water source other than groundwater, such as surface water. The purpose of this research is to design a water treatment system using the Agathis UI Lake water as the source to serve FIK UI need of clean water until 2042. The operation unit being the main focus of this designing process is the filtration using slow sand filter with silica sand and granular activated carbon as the filter medias, which both known effective to reduce iron, manganese, and fecal coliform concentration in raw water as the three parameters are important criterias in the Indonesias Health Minister Rule number 492 year 2010 about The Criterias of Drinking Water Quality. The amount of clean water need of FIK UI projected is 2,82 L/s. This design based on literatures and legal standards, especially in deciding the removal efficiency of the three parameters being said before of the slow sand filter. Based on the review of literatures, journals, and experiment results being done by others, the slow sand filter of this water treatment design can reach the removal efficiency of iron, manganese, and fecal coliform by 95,07%; 97,09%; and 99% respectively if the filter have 60 cm thick of silica sand above and 40 cm of granular activated carbon underneath the sand. One intake unit, two suction wells with two centrifugal pumps, one conveyance system, two slow sand filter units, one disinfection and reservoir unit, and two filter media cleaning units created to produce 3,8 L/s of clean water for FIK UI until 2042.