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"ABSTRAKKrisis air bersih di daerah berair payau belakangan ini semakinmemprihatinkan terutama saat musim kemarau tiba. Mesin Reverse Osmosis (RO)yang berfungsi untuk mengolah air tanah menjadi air bersih bagi penduduk daerahberair payau juga sudah tidak berfungsi secara maksimal. Karena kebutuhan airbersih yang dibutuhkan tidak tersedia, penduduk setempat terpaksa menggunakanair tanah dari sumur mereka yang berasa asin (payau). Hal tersebut mendorongpengembangan alat water purifier yang dapat mengatasi krisis air bersih di daerahberair payau secara aplikatif. Alat ini memanfaatkan prinsip kerja filtrasi, adsorpsi,dan desalinasi. Unit filtrasi menggunakan saringan micron, unit adsorpsimenggunakan kombinasi adsorben zeolite dan karbon aktif, dan unit desalinasimenggunakan metode capacitive deionization. Alat ini direncanakan akan berfungsidengan output 5 Liter. Kriteria yang akan ditinjau dalam mengetahui kinerja waterpurifier adalah kualitas produk keluaran berupa konsentrasi TDS (mg/L),konduktivitas (μS/cm), dan penurunan kadar garam (%). Variasi yang dilakukandalam penelitian ini adalah jenis air payau yang memiliki konsentrasi TDS dankonduktivitas berbeda, susunan ketinggian adsorben pada unit adsorpsi, dantegangan pada unit desalinasi. Unit desalinasi dengan capacitive deionizationbekerja optimum pada tegangan 2V dan jenuh pada waktu 15 menit. Penurunankadar garam maksimal dari unit desalinasi mencapai 13,4%. Energi yangdibutuhkan sel CDI pada penelitian ini adalah 1,05 kWh/m3. Pada unit filtrasi danadsorpsi komposisi ketinggian adsorben paling baik adalah 40cm-40cm (karbonaktif-zeolit) yang memiliki penurunan kadar garam 17,1%. Total penurunan kadargaram pada alat water purifier ini adalah 30,4%.

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ABSTRACTRecently, clean water crisis in brackish water area is increasing, particularly duringthe dry season. Water sources that have been used by residents is low. ReverseOsmosis (RO), which serves to cultivate the soil water into clean water for theinhabitants of brackish water area also was not functioning optimally. Because ofthe need of clean water required are not available, local residents are forced to useground water from their wells that are salty (brackish). It encourages thedevelopment of water purifier that can overcome the water crisis directly in thebrackish watery region. This water purifier utilizes the working principles offiltration, adsorption, and desalination. Filtration unit uses a micro fiber filter,adsorption units uses a combination between the zeolite adsorbent and activatedcarbon, and the desalination unit used capacitive deionization as the method. Thistool is planned to be functioning with an output of 5 L. The criteria that will bereviewed in knowing the water purifier's performance is the quality of the productoutput of TDS concentrations (mg / L), conductivity (μS / cm), and decrease of saltcontent (%). This research involves the variation of feed?s TDS concentration andconductivity, the height combination of both adsorbents, and the applied voltage onCDI cell. Desalination unit with capacitive deionization work optimally at a voltageof 2V and saturated at 15 minutes. The maximum decrease of salt content atdesalination unit is 13.4%. The CDI cells required 1.05 kWh / m3 energy. Onfiltration and adsorption unit, the best height combination of adsorbents is 40cm-40cm (activated carbon-zeolite) that has a 17.1% reduction in salt levels. Totaldecrease in salinity in the water purifier tool is 30.4%."

"The book details the innovative TERM (The Enormous Regional Model) approach to regional and national economic modeling, and explains the conversion from a comparative-static to a dynamic model. It moves on to an adaptation of TERM to water policy, including the additional theoretical and database requirements of the dynamic TERM-H2O model. In particular, it examines the contrasting economic impacts of water buyback policy and recurring droughts in the Murray-Darling Basin. South-east Queensland, where climate uncertainty has been borne out by record-breaking drought and the worst floods in living memory, provides a chapter-length case study. The exploration of the policy background and implications of TERM’s dynamic modeling will provide food for thought in policy making circles worldwide, where there is a pressing need for solutions to similarly intractable problems in water management."

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Sungai Cilutung merupakan salah satu potensi sumberdaya air yang berperan penting dalam memenuh kebutuha air terutama di Kabupaten Sumedang dan Majalengka. Kekeringan yang terjadi di DAS Cilutung pada beberapa tahun terakhir menandakan bahwa perlu adanya pemautauan ketersediaan air di DAS tersebut. Perubahan pola tutupan lahan selama sepuluh tahun terakhir serta faktor curah hujan memungkinkan berpengaruh terhadap ketersediaan air. Tujuan dari penelitian ini adalah untuk mengetahui ketersediaan air tahunan, musim kering dan musim pancaroba di DAS Cilutung pada tahun 2009 dan 2019 terkait dengan dinamika perubahan tutupan lahan. Peta tutupan lahan pada tahun 2009 dan 2009 diperoleh dari Citra Landsat series yang diklasifikasikan menjadi 6 (enam) kelas tutupan lahan. Metode yang digunakan dalam perhitungan ketersediaan air dan kebutuhan air adalah Model InVEST Water Yeild yang merupakan motode hidrologi dengan pendekatan neraca air. Hasil perhitungan menunjukkan bahwa curah hujan dan tutupan vegetasi berkorelasi positif terhadap ketersediaan air, sedangkan peningkatan lahan terbangun berkorelasi positif dengan kebutuhan air. Pada tahun tahun 2009 Sub DAS 7 mempunyai hasil air tinggi dibanding Sub DAS lainnya, namun pada tahun 2019 hasil air tertinggi dihasilkan oleh Sub DAS 6, hal itu disebabkan oleh meningkatnya lahan terbangun yang cukup signifikan di Sub DAS 7 sehingga meningkatkan nilai kebutuhan air di Sub DAS tersebut. Sub DAS dengan hasil air tinggi dapat digunakan sebagai masukan dalam memilih daerah prioritas konservasi sumberdaya air untuk mempertahankan pasokan air di DAS Cilutung.

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Cilutung River is one of the potential water resources that plays an important role in meeting water needs, especially in Sumedang and Majalengka Districts. The drought that has occurred in the Cilutung watershed in recent years indicates that there is a need for monitoring of water availability in the watershed. Changes in land cover patterns during the last ten years as well as rainfall factors may affect water availability. The purpose of this study was to determine the annual water availability, dry season and transition seasons in the Cilutung watershed in 2009 and 2019 related to the dynamics of land cover change. Land cover maps in 2009 and 2009 were obtained from the Landsat series imagery which is classified into 6 (six) land cover classes. The method used in calculating water availability and water demand is the InVEST Water Yeild Model which is a hydrological method with a water balance approach. The calculation results show that rainfall and vegetation cover have a positive correlation with water availability, while the increase in built-up land has a positive correlation with water demand. In 2009 Sub DAS 7 had high water yields compared to other sub-watersheds, but in 2019 the highest water yield was produced by Sub DAS 6, this was due to a significant increase in built-up land in Sub DAS 7 thus increasing the value of water needs in Sub-watershed. The watershed. Sub-watersheds with high water yield can be used as input in selecting priority areas for water resource conservation to maintain water supply in the Cilutung watershed.

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