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All Journal Buletin Peternakan Eksergi: Chemical Engineering Journal JMM (Jurnal Masyarakat Mandiri) Venn: Journal of Sustainable Innovation on Education, Mathematics and Natural Sciences KOLONI Jurnal Pengabdian Pada Masyarakat METHABDI Jurnal Teknologi Kimia Mineral Jurnal Pengabdian Masyarakat dan Riset Pendidikan Journal Of Chemical Process Engineering
Zakiyah Darajat
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Pemodelan dan Optimasi Pengaruh Variasi Suhu Pirolisis Lambat terhadap Yield dan Nilai Kalor Biochar Tongkol Jagung Darajat, Zakiyah; Septiani, Mimin; Sukasri, Arifah; Ole, Maria Assumpta Nogo
Venn: Journal of Sustainable Innovation on Education, Mathematics and Natural Sciences Vol. 5 No. 2 (2026): Biology, Physics, Chemistry, and other Basic Sciences
Publisher : Pusat Studi Bahasa dan Publikasi Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53696/venn.v5i2.418

Abstract

Biochar is a solid product derived from biomass pyrolysis with considerable potential as an alternative energy source and functional material. One of the key parameters influencing biochar characteristics is pyrolysis temperature. This study aims to model and optimize the effect of slow pyrolysis temperature variations on the yield and calorific value of biochar produced from corncob feedstock. The pyrolysis process was conducted using a slow pyrolysis method at temperatures of 350, 400, 450, and 490 °C, with a low heating rate and a residence time of 60 minutes. The resulting biochar was characterized through proximate analysis, while its calorific value was determined using a bomb calorimeter. The relationship between pyrolysis temperature and both yield and calorific value was modeled using polynomial regression. Multi-response optimization was subsequently performed using the desirability function approach. The results indicate that increasing the pyrolysis temperature leads to a reduction in biochar yield, while simultaneously increasing fixed carbon content and stabilizing the calorific value at higher temperatures. The regression model demonstrated strong agreement with the experimental data, with a coefficient of determination (R²) of 0.9582, indicating excellent model fit. Multi-response optimization revealed that the optimal pyrolysis temperature was 350 °C, producing a biochar yield of 79.71% and a calorific value of 7050 cal/g. This study provides a scientific basis for determining optimal slow pyrolysis operating conditions to enhance the valorization of corncob waste as a biochar-based renewable energy resource.
Perbandingan Hasil Delignifikasi Jerami Padi menggunakan Natural Ternary Deep Eutectic Solvent dengan Variasi Penambahan Air Ole, Maria Assumpta Nogo; Ranggina , Dian; Pampang, Harun; Yunus, Muhammad Arham; Darajat, Zakiyah; Septiani, Mimin; Maharani , Andina Sari; Cincing, Andi Ahmad Maulana Senna; Pertiwi, Sherlina Zalfa; Bala, Dwi Ferel Imanuel
JURNAL TEKNOLOGI KIMIA MINERAL Forthcoming issue
Publisher : Politeknik ATI Makassaar

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Abstract

Jerami padi, sebagai hasil samping pertanian yang melimpah di Indonesia, memiliki potensi besar sebagai bahan baku untuk produksi energi terbarukan seperti biohidrogen dan bioetanol. Kandungan lignin dalam biomassa menghambat hidrolisis sehingga perlu dikurangi; untuk itu penelitian ini mengembangkan metode delignifikasi menggunakan Natural Ternary Deep Eutectic Solvent (NATDES) yang tersusun dari kolin klorida, asam laktat, dan asam sitrat pada rasio molar 0,1:0,6:0,3 dengan variasi penambahan air 0–20% (v/v). Perlakuan dilakukan pada rasio padatan:pelarut 1:10 (w/v) dalam reaktor pada 121 °C. Analisis FTIR pada residu padatan menunjukkan kadar lignin terendah (0,72%) pada perlakuan dengan 20% air, yang mengindikasikan bahwa penambahan air menurunkan viskositas NATDES dan meningkatkan efisiensi delignifikasi. Analisis gula pereduksi menggunakan metode dinitrosalisilat (DNS) menunjukkan bahwa kadar gula pereduksi terlarut tidak maksimal pada perlakuan 20% air akibat adanya fenolik bebas hasil degradasi lignin; oleh karena itu perlakuan pra‑analitik untuk assay DNS perlu dioptimalkan untuk menghilangkan interferensi fenolik, furfural, dan kekeruhan serta memastikan kuantifikasi gula pereduksi yang akurat. Hasil penelitian ini menunjukkan perlunya optimasi kandungan air dalam formulasi NATDES untuk meningkatkan potensi NATDES sebagai pelarut hijau untuk mendukung konversi jerami padi yang lebih bersih dan efisien.
Kinetics of BTX Removal by Rhodococcus Erythropolis in a Slurry Bioreactor Ole, Maria Assumpta Nogo; Ranggina, Dian; Pampang, Harun; Darajat, Zakiyah
Venn: Journal of Sustainable Innovation on Education, Mathematics and Natural Sciences Vol. 5 No. 2 (2026): Biology, Physics, Chemistry, and other Basic Sciences
Publisher : Pusat Studi Bahasa dan Publikasi Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53696/venn.v5i2.421

Abstract

Benzene, toluene, and xylene (BTX) contamination arising from oil-drilling operations constitutes a persistent environmental challenge, necessitating the development of robust bioremediation strategies underpinned by kinetic evaluation. This study systematically investigated the kinetics of BTX removal by Rhodococcus erythropolis in a slurry-phase bioreactor employing soil sourced from the PPEJ oil-drilling site in Tuban, Indonesia, with particular emphasis on the influence of inoculum concentration on the k₀ and the Kₘ. Batch experiments were conducted at inoculum loadings of 12,5%, 15%, and 17,5% (v/v), with periodic monitoring of dissolved-phase BTX concentrations and BOD. Analytical methodologies encompassed gas chromatography–mass spectrometry (GC–MS) for the quantification of BTX and intermediate metabolites, BOD assessment, and kinetic modeling to estimate k₀ and Kₘ values. The results demonstrated that incremental increases in inoculum concentration consistently elevated the k₀, thereby expediting BTX removal in reactors with higher biomass. However, a concomitant decline in specific activity per unit biomass was observed at the highest inoculum level, attributable to mass-transfer limitations—specifically, restricted diffusion of oxygen and substrate into microbial flocs—and heterogeneity in enzyme induction. The estimated Kₘ values exhibited variability across inoculum concentrations, indicating that substrate affinity is modulated by reactor physical parameters and microbial enzymatic adaptation. These findings underscore the necessity of optimizing inoculum concentration in concert with operational parameters such as dissolved oxygen control, agitation intensity, and structured kinetic assays to ensure that enhancements in k₀ are translated into effective per-cell degradation and complete mineralization of BTX contaminants in soils impacted by oil-drilling activities.
Co-Authors A Mufhida Rezky Amalia Azzahra Hayat Ali Agus Andi Aladin Bala, Dwi Ferel Imanuel Cincing, Andi Ahmad Maulana Senna Dian Ranggina Fadhil Dwi Syahputra Fauziah Nur Aisyah, Fauziah Fitria Fitria Fitria Fitria Gunarya Muhammad Rachman Hayat, A Mufidha Rezky Amalia Azzahra Krishna Agung Santosa Maharani , Andina Sari Maria Assumpta Nogo Ole Mufli, Muh Fadil Muh Fadil Mufli Munira Munira, Munira Nurfiansyah, Nurfiansyah Ole, Maria Assumpta Nogo Pampang, Harun Pertiwi, Sherlina Zalfa Rachman, Gunarya Muhammad Ranggina , Dian Sabara, Zakir Septiani, Mimin Sukasri, Arifah Syahputra, Fadhil Dwi Takdir Syarif Uti Sujatinah Yunus, Muhammad Arham Zuhrotul Fikri Ilma