Judul: Penerapan biofilter untuk penghilangan NH3 dan H2S dengan menggunakan bakteri Nitrosomonas sp dan Thiobacillus sp di pabrik latek pekat
Abstrak: Karet merupakan salah satu komoditi hasil pertanian yang sangat besar. Jumlah produksi karet Indonesia pada tahun 2004 mencapai 1.851 juta ton yang terdiri dari perkebunan rakyat dan perkebunan besar. Karena jumlah produksi karet yang sangat besar, maka industri karet di Indonesia mengalami perkembangan seperti industri RSS (Ribbed smoked sheet), karet remah dan lateks pekat. Berkembangnya industri ini menghasilkan masalah baru yaitu pencemaran lingkungan. Salah satunya adalah pencemaran udara yang dihasilkan dari parik lateks pekat dimana lateks pekat ini membutuhkan amoniak yang cukup banyak dalam proses produksinya dan menghasilkan gas H2S dari limbah cair dan lump. Tujuan utama penelitian ini adalah untuk mengetahui kemampuan teknik biofilter dalam mengatasi permasalahan emisi gas yang dikeluarkan dari pabrik lateks pekat. Tujuan khususnya adalah menentukan kapasitas penyerapan emisi gas pada masing-masing biofilter dan menentukan campuran bahan pengisi tambahan terhadap kinerja biofilter berdasarkan kemampuan menghilangkan emisi gas amoniak dan hidrogen sulfida.
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Judul: Penghilangan Gas H2S dan NH3 dengan Teknik Biofilter pada Ruang Produksi Pabrik Karet PTPN VIII Cikumpay, Purwakarta
Abstrak: Karet alam (natural rubber) yang diperoleh dari tanaman Hevea Braziliensis merupakan salah satu komoditas ekspor unggulan Indonesia yang jumlahnya cukup besar. Perkembangan industri karet menyebabkan timbulnya emisi berupa amoniak (NH3) dan hidrogen sulfida (H2S) yang mengganggu kesehatan pekerja pabrik karet. Biofilter adalah teknologi pengendalian pencemaran udara dengan cara menumbuhkan mikroorganisme pada bahan pengisi sehingga terbentuk biofilm atau biolayer yang dapat mengurai bahan-bahan pencemar udara.
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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