Judul: Evaluasi Kinerja Co-composting Bagas dengan Blotong pada Kapasitas Proses yang Ditingkatkan
Abstrak: Penelitian untuk menentukan kondisi optimum proses co-composting bagas dan blotong pada skala laboratorium telah dilakukan. Namun, untuk dapat diaplikasikan di industri perlu dilakukan evaluasi terhadap kinerja co-composting dengan membandingkannya pada skala yang lebih besar. Parameter kinerja utama yang dievaluasi meliputi kinetika proses berupa laju pengomposan serta pengaruh aerasi terhadap laju penurunan C/N. Peningkatan skala co-composting dilakukan dengan memperbesar kapasitas produksi dari 5 kg (skala laboratorium) menjadi 100 kg. Faktor yang dipertahankan berupa kesamaan geometri reaktor, laju aerasi dan nilai C/N awal. Berdasarkan hasil penelitian didapatkan proses co-composting pada kapasitas 100 kg memberikan laju pengomposan yang lebih rendah dibandingkan dengan kapasitas 5 kg. Selain itu perlakuan aerasi selama proses co-composting kapasitas 100 kg tidak memberikan pengaruh terhadap laju penurunan C/N. Hal ini dikarenakan perbedaan densitas dan kecepatan alir udara yang membuat kondisi proses keduanya berbeda.
Keyword: evaluasi, kinerja, co-composting, C/N, aerasi

Judul: Evaluasi Kinerja Peningkatan Kapasitas Pengomposan dari Campuran Blotong, Bagas, dan Abu Ketel
Abstrak: Composted filter cake, bagasse, and boiler ash on laboratory scaled which used aerated pile method had generated an optimum initial C/N and resulted the best compost quality. Meanwhile in order to be applied directly in industrial scale, the evaluation of laboratory scaled co-composting performance was needed along with increased processing capacity. The aim of this study was to compare larger scale of co-composting performance evaluation with laboratory scale. Capacity enhancement was done by increasing the capacity process from laboratory scaled of 5 kg to 100 kg. The evaluated performance parameters in co-composting were composting rate and the effect of aeration during composting. While constant factors, as same as capacity of 5 kg’s, were reactor geometrical congruency, initial C/N and aeration treatment. Compost mixture had initial C/N value of 50 and active aeration treatment of 0.4 L/min.kg was given in for 1 hour per day in the first week. The result showed that there were no any significant differences of composting rate between 5 kg and 100 kg. Besides, active aeration did not give significant effect to process condition and the composting rate in 100 kg scaled co-composting. Financial analysis of composting was able to bring profits based on the equation of B/C ≥1.
Keyword: evaluation of capacity process, co-composting, C/N, capacity enhancement, aeration

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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