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All Journal Journal of Tropical Chemistry Research and Education Petrogas : Journal of Energy and Technology
machrifah, Aici ichtiarizak
STT Migas Balikpapan
Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy

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PENGOLAHAN SAMPAH PASAR DAN RESTORAN DENGAN MENGGUNAKAN REAKTOR BATCH Yuniarti Yuniarti; Bustam Sulaiman; Aici Ichtiarizak
PETROGAS: Journal of Energy and Technology Vol 2, No 1 (2020): March
Publisher : Sekolah Tinggi Teknologi MIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58267/petrogas.v2i1.29

Abstract

Pemerintah telah menerbitkan Peraturan Presiden Republik Indonesia nomor 5 tahun 2006 tentang kebijakan energi nasional untuk mengembangkan sumber energi alternatif. Kebijakan tersebut menekankan pada energi altenatif salah satunya adalah biogas. Biogas ini berasal dari berbagai macam limbah organik seperti, sampah pasar, restoran, kotoran hewan dan sebagainya. Balikpapan merupakan daerah penghasil sampah restoran dan pasar dalam jumlah yang banyak, sehingga peluang besar untuk memproduksi gas dengan volume yang besar dapat terealisasi. Biogas yang dihasilkan dari sampah organik adalah gas yang mudah terbakar. Gas ini dihasilkan dari fermentasi bahan – bahan organik oleh bakteri anaerob. Penelitian dilakukan dua tahap pelaksanaan, tahap pertama pembuatan alat digester dengan menggunakan tabung gas 12 kg sebagai reaktor. Output reaktor dihubungkan dengan manometer bentuk U sebagai pengukur tekanan dan volume gas. Biogas tertinggi yang dihasilkan oleh sampah pasar dan restoran berada pada hari pertama dan kedua berturut-turutdimulai pada hari pertama dengan 0 ml berangsur-anasu naik secara beraturan menuju hari kedua dan seterusnya 496,83, 817,35, 861,94, 869,40, 896,64, 930,04, 974,44, 1034,52, 1100,93, 1153,55 ml.  setelah campuran sampah masuk kedalam reaktor. Hal ini dapat terjadi karena sampah pasar dan restoran yang dimasukkan sudah terbentuk gas sebelum masuk ke reaktor. Mendekati hari ketiga dan maksimal, gas sudah sedikit terbentuk. Hal ini bisa disebabkan karena kandungan-kandungan bahan organik di dalam sampah yang terurai menjadi gas sudah mulai habis.
Cognitive-Level and Item-Quality Analysis of Multiple-Choice Items inan Introductory Oil, Gas, and Renewable Energy Course Megawati, Eka; Mukminin, Amirul; Monde, Junety; Machrifah, Aici Ichtiarizak
Journal of Tropical Chemistry Research and Education Vol. 8 No. 2 (2026)
Publisher : Chemistry Education Department, Faculty of Tarbiyah and Education, UIN Sunan Kalijaga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/jtcre.2026.82-01

Abstract

The courses “Introduction to the Oil & Gas Industry” and “New and Renewable Energy” are taught to first-semester students in the Diploma III Program in Oil and Gas Processing Engineering at the College of Oil and Gas Technology. The Course Learning Outcomes (CLOs) specify the “Application” level (C3) in Bloom’s Revised Taxonomy as the highest cognitive target. However, the cognitive levels and quality of the course’s multiple-choice question bank have not yet been systematically evaluated based on these targets. This study aims to analyze the cognitive level and quality of 50 multiple-choice questions from this question bank. A descriptive content analysis combining quantitative categorization and qualitative expert review methods using a content analysis approach was employed, integrating qualitative expert assessments with frequency and percentage calculations. One reviewer with expertise in educational assessment and evaluation and one in chemical engineering reviewed the questions by evaluating their clarity, question wording, answer choices, and question construction, and classified each question into levels C1 through C3. The findings indicate a predominance of inquiries at the “Recall” (C1, 50%) and “Understanding” (C2, 40%) stages, with a lesser share at the “Application” (C3, 10%) stage; while this distribution corresponds with the CLO, which designates C3 as the maximum, it suggests that higher-level inquiries are still lacking. 76% of the items met quality standards for clarity and question wording, 82% for answer options, and 68% for overall structure; the remaining items required revisions because of issues such as inconsistent terminology, ineffective distractions, non-uniform "all of the above" choices, and unclear instructions in the question stem. The study concludes that while the item bank is in line with the learning objectives of the course, further empirical testing on difficulty, discriminative ability, and reliability is required before it can be implemented.
Co-Authors Amirul Mukminin Bustam Sulaiman Megawati, Eka Monde, Junety Yuniarti Yuniarti