Judul: Desain proses produksi biogas dari jerami padi dan sampah pasar dengan sistem fermentasi media padat
Abstrak: The purpose of this research were to design of fermentation process for converting rice straw and organic waste from traditional market to produce biogas, to know influence of aeration, to obtain the best feed addition in fermentation, and to obtain characteristic of product (digestate and leachate) from fermentation process. Beef cattle manure as substrate was inoculated to anaerobic digestion. Laboratory experiments using 10 l digester were performed in batch mode. The operating temperature was mesophilic condition (35-40oC). Fermentation rice straw with feed addition 75% new feeds and 25% digestate could produce 42.2 l gas/kg VS higher than fermentation rice straw from all new feeds (28.1 l gas/kg VS) and fermentation from 50% new feeds and 50% digestate (15.8 l gas/kg VS). While fermentation waste market from all new feeds could produce 51.8 l gas/kg VS higher than fermentation with feed addition 75% new feeds and 25% digestate (39.7 l gas/kg VS) and fermentation from 50% new feeds and 50% digestate (31.1 l gas/kg VS). The cumulative volume of biogas produced was used to measure the biodigester performance. The research gave the kinetic parameters of biogas production for rice straw i.e. biogas production rate constants (Rmax), maximum biogas production (A), and minimum time to produce biogas (λ) were 1.37-2.07 (l/kg VS.day), 15.82-42.25 (l/kgVS), and 0.4-2.0 days, respectively. While the organic waste from market gave the kinetic parameters U, A, and λ of 1.58-3.55 (l/kgVS.day), 31.09-51.84 (l/kgVS), and 0.2-1.2 days, respectively.
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Judul: Konversi sampah organik pasar dengan sistem fermentasi media padat menjadi biogas dan pupuk organik.
Abstrak: In 2010 Indonesia produced 200 thousand tons of waste everyday. It causes problems for the society and for environment. The purposes of this research are to design and get an optimal process condition for solid medium fermentation to convert organic waste from traditional market into bioenergy and organic fertilizer, to characterize biogas, digestate, and leachate. The experiments were conducted with 1.5 L and 10 L reactors . Composition of organic waste from traditonal market that gave higest volume of biogas are banana leaf 7.5%, cornhusk 24.2%, bitter melon 14.8%, cabbage 19.9%, chicory 6.2%, water spinach 8.0%, mustard 8.0%, carrots 11.5% (w/w). It produced 4500 ml biogas/kg biomass and the maximum production was reached within 17 days. This equal to biogas production of 37.63 ml biogas/gram VS. Fermentation process in 10 liter reactor with adition of 75% feed, 50% of feed, and 100% feed produced 12378 ml, 10908 ml, and 16707 ml biogas, respectively leachate consists nitrogen 473-4500 ppm, phosphat 47-150 ppm, and COD 8333-12500 mg/l, while the digestate consists of carbon 28-49%, nitrogen 0.7-1.7%, phosphat 0.2-0.4%, and COD 16000-18000 mg/kg. Concentration of methane in biogas is still low and hence futher experiments needed to increase methane concentration. Keywords : organic waste, biogas, digestate, leachate, solid state fermentation
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Judul: Kupu-kupu papilionids (Insecta: Lepidoptera) di Sulawei Selatan: diversitas dan morfologi sayap
Abstrak: Kupu-kupu papilionids merupakan kupu-kupu yang memiliki ukuran sayap yang lebar, warna cerah dan terdapat “ekor” di bagian ujung sayap metathotaks. Beberapa spesies kupu-kupu memiliki distribusi yang luas di Indonesia, tetapi terdapat beberapa kupu-kupu endemik di Pulau Sulawesi. Saat ini, jumlah spesies kupu-kupu papilionids makin menurun yang disebabkan oleh aktivitas manusia. Oleh karena itu, penelitian ini bertujuan untuk mengetahui jumlah spesies dan individu kupu-kupu papilionids, pola warna sayap, dan struktur warna sayap kupu-kupu. Penelitian ini dilakukan pada bulan Januari-April 2015. Sampling dilakukan dalam tiga wilayah, yaitu Cagar Alam Leang-leang, Cagar Alam Pattunuang dan Taman Wisata Bantimurung selama tiga bulan. Daerah sampling meliputi hutan sekunder, area persawahan dan taman wisata. Pengamatan dilakukan pada pagi hari (08.00-12.00 WITA) dan siang hingga sore hari (pukul 13.00-16.00 WITA). Pengamatan tersebut meliputi jumlah spesies dan individu kupu-kupu, tumbuhan berbunga, dan faktor lingkungan. Dalam penelitian ini diperoleh 21 spesies dari 1,077 individu kupu-kupu papilionid. Jumlah spesies dan individu kupu-kupu terbanyak ditemukan di Taman Wisata Bantimurung (18 sp., 459 ind), diikuti oleh Cagar Alam Leangleang (18 sp,, 348 ind) dan Cagar Alam Pattunuang (17 sp., 275 ind. Genus Papilio merupakan kupu-kupu yang paling sering ditemukan selama pengamatan. Hasil penelitian ini menunjukkan bahwa pola warna sayap kupu-kupu papilionids, terutama kupu-kupu genus Papilio, mengikuti gabungan venasi sayap dan model The Nymphalid Ground Plan (NGP). Sebagian besar, warna sayap berada pada bagian tengah hingga ke bagian batas luar (border). Pola warna sayap tampak berbeda-beda, terutama pola warna yang terdapat di bagian venasi sayap. Hal ini diakibatkan oleh struktur sisik sayap. Struktur sisik sayap mempunyai dua tipe, yaitu rectangular dan triangular, yang tersusun seperti genteng rumah. Sisik sayap memiliki struktur yang dapat mengontrol pantulan dan penyerapan cahaya ultraviolet (UV). Kupu-kupu papilionids dapat memiliki warna sayap yang sama dengan kupu-kupu papilionids lainnya, namun tiap spesies memiliki struktur sisik sayap yang berbeda.
Keyword: Keanekaragaman, papilionids, identifikasi, warna sayap, sisik sayap