Judul: Pemanfaatan Khitosan sebagai Pengikat Ion Logam Khrom dalam Limbah Cair Industri Penyamakan Kulit dengan Menggunakan Metode Kolom dan Sentrifugasi
Abstrak: Pemanfaatan khitosan dari limbah kulit udang dan rajungan selain untuk meningkatkan nilai tambah dari limbah tersebut, juga karena khitosan mempunyai kemampuan untuk menjerap logam berat sehingga dapat digunakan sebagai bahan untuk penanganan limbah. Penelitian ini bertujuan untuk menentukan dosis khitosan dan mengetahui pengaruh metode dan sumber khitosan yang digunakan untuk menurunkan kandungan khrom.
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Judul: Mempelajari Pengolahan Limbah Khrom Industri dengan Menggunakan Kombinasi Natrium Bisulfit, Ferri Khlorida dan Polyacryl Amida di PT. Makmur Sejahtera Lestari, Tangerang
Abstrak: Limbah cair industri penyamakan kulit mengandung beban celiiaran yang tinggi, seperti logam khrom, padatan tersuspensi organik dan anorganik, snlfida, COD (Cl?cmical Oxygen Dcnlond), kekeruhan. dan pH yang rendah serta bahanbahan kiinia lainnya. Limbah cair yang mengandung logam khroln dapat merusak fungsi ginjal, usus manusia dan dapat ~nerusak keseimbangan ekosistem flora dan fauna serta dapat inenyebabkan penyakit Ecz~~muroudsi~ rniutitis. Pengolahan limbah cair industri penyaniakan kulit yang mengandung khrom clengan nienggunakan NaHSO, bertujuan mereduksi khromat yang berbahaya dan beracun nienjadi bentuk logam yang relatif aman. Hasil reduksi diendapkan sebagai C H ) Koagulan FeC13 merupakan koagulan yang umum digunakan karena nie~niliki kemampuan yang tinggi dalani menurunkan kandungan partikel tersuspensi. Penggunaan polyacryl amida sebagai flokulan kationik, yakni untuk meningkatkan performansi koagulan untuk membentuk flok-flok yang lebih besar dan akhirnya beban pencemaran terendapkan dengan baik. Tujuan penelitian ini adalah menipelajari pengaruh pengolahan limbah khrom tlengan menggc~nakank ombinasi NaHSO,, FeCI,, dan polyacryl a~nidate rhadap penurunan beban cemaran kandungan khroiii, COD, TSS, kekeruhan dan pH.
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Judul: Characteristic of Overshooting Top (OT) Based on  Himawari  8  Satellite  as  a  Convective  Cloud  Feature  that  Generates  Extreme Weather in the Java Island Region
Abstrak: Overshooting Top (OT) is a feature at the top of a convective cloud that is associated with extreme weather. Research on OT in tropical Indonesia is still very limited. The existence of geostationary satellites with wide area coverage and fast frequency observations is useful for observing the fast dynamics of the OT life cycle. Therefore, this study intends to analyze the relationship between OT and extreme weather, updraft and thermodynamic conditions of OT when extreme weather occurs, the best objective method for detecting OT in the day time and night time, and the spatiotemporal distribution of OT in the tropical region of Java Island during the 2018-2021 period. Based on visual analysis using visible channel and Himawari 8 sandwich products, 87% of extreme weather events in Java were accompanied by the appearance of OT. It indicates that the presence of the OT pattern is a convection cloud pattern or feature that is closely related to extreme weather events for the Java Island region. The existence of a time lag between the appearance of OT and extreme weather events on Java Island indicates that the OT of convection cloud can be used as a precursor or nowcasting for the appearance of extreme weather. Most of the convective cloud OT features during extreme weather events on Java Island have altitude that were only able to exceed the altitude of the equilibrium level and few were able to exceed the tropopause level of 9 km – 16 km. The difference in atmospheric conditions during extreme weather events on Java Island, which is in the tropics and subtropics, is a strong and unstable convective energy condition characterized by a larger CAPE, as well as unstable KI, LI, SI and TTI values. It is offset by kinematic factors in the form of a weak vertical wind shear (bulk wind shear 0-6 km) and a higher freezing point height. The difference between extreme weather events in the Java Island region and other tropical regions compared to subtropical regions is the strong updraft speed of convection clouds. The IRW Texture COMB algorithm based on the IRW-Texture Gradient modification and the COMB algorithm shows a significant increase in quality for detecting OT and non-OT pixels in Java. Rainy days with rainfall > 50 mm/day are very common in areas with an altitude of > 500 m. On the other hand, the level of convection activity which is indicated by the presence of OT and lightning is significantly reduced in this area. OT of convective clouds appear more frequently during the DJF season and less frequently during the JJA season. OT often appears during the day time and rarely at night time. Most OTs appear in the central part, away from the south and north coasts of Java Island during the day, while OTs that appear near the south and north coasts of Java Island can appear in the morning or afternoon.
Keyword: convective clouds, extreme weather, Overshooting Tops, Himawari 8 Satellite