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Dwiwahju Sasongko
Institut Teknologi Bandung
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Radiasi Microwave dan Perlakuan Asam pada Batubara Peringkat Rendah terhadap Perolehan Biosolubilisasi Menggunakan Neurospora intermedia Nendry Nurramdani Solihah; Dwiwahju Sasongko; Elvi Restiawaty
Jurnal Teknik Kimia Indonesia Vol 19, No 1 (2020)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2020.19.1.3

Abstract

Abstrak. Biosolubilisasi batubara peringkat rendahmerupakan teknologi yang menjanjikan untuk mendapatkan bahan bakar cair yang ramah lingkungan. Biosolubilisasi batubara peringkat rendah dapat dilakukan dengan menggunakan mikroorganisme seperti Neurospora intermedia yang mampu menghasilkan enzim-enzim pensolubilisasi. Mekanisme biosolubilisasibatubaraterjadikarenaadsorpsienzim-enzim tersebutkepermukaan partikel batubara, sehingga proses perlakuan awal batubara perlu dilakukan untuk memudahkan proses adsorpsi enzim.Penelitian ini dilakukan untuk mengkaji pengaruh perlakuan awal partikel batubara peringkat rendah terhadap struktur batubara dan perolehan biosolubilisasi. Pengaruh perlakuan awal tersebut dikaji dengan membandingkan biosolubilisasi menggunakan partikel batubara tanpa perlakuan awal (B1), perlakuan fisik dengan memberikan radiasi microwave 511 Watt selama 5 menit (B2), perlakuan kimiawi dengan merendam partikel batubara dalam HNO3 8 M selama 48 jam (B3), serta perlakuan kombinasi radiasi microwave selama 5 menit dan HNO3 dengan konsentrasi 2, 4, 6, dan 8 M selama 48 jam (B4, B5, B6, dan B7). Partikel batubara B1 memiliki rentang diameter mesopori sebesar 33,97 Å, sedangkan partikel batubara yang telah mengalami perlakuan awal mengalami peningkatan diameter pori namun masih dalam rentang mesopori. Luas permukaan persatuan massa dan volume pori yang tertinggi diperoleh dari perlakuan B3, masing-masing adalah 44,39 m2/g dan 0,09 cc/g. Hasil analisis proksimat dan ultimat menunjukkan bahwa perlakuan asam dapat mengurangi kandungan karbon terikat. Secara kualitatif dapat terlihat bahwa biosolubilisasi batubara B1, B2, B4, dan B5 tidak terjadi dengan baik, sehingga tidak terdapat cairan hitam sebagai hasil batubara yang tersolubilisasi, sedangkan biosolubilisasi batubara B3, B6, dan B7 menghasilkan cairan hitam sejak hari pertama. Secara kuantitatif, biosolubilisasi batubara peringkat rendah menggunakan perlakuan B3 menghasilkan konsentrasi asam humat dan persentase biosolubilisasi yang tertinggi, masing-masing yaitu 186,1 mmol/L dan 67,8%. Kata kunci: biosolubilisasi batubara, HNO3, Neurospora intermedia, radiasi microwave. Abstract. Effect of Microwave Radiation and Acid Treatment on Low Grade Coal on Biosolubilization Acquisition Using Neurospora intermedia. Bio-solubilization of low rank coal is a promising technology to obtain environmentally friendly liquid fuel. Bio-solubilization can be carried out using microorganism, such as Neurospora intermedia, which is capable to produce solubilizing enzymes. Mechanism of coal bio-solubilization occurs due to enzymes adsorption onto surface of coal, so that the low rank coal pre-treatment is needed to easy enzyme adsorption. This research examines the effects of low rank coal pre-treatment towards coal structure and bio-solubilization yields. The effects of the pre-treatment were studied by comparing the bio-solubilization using coal with the following specification: without treatment (B1), physical pre-treatment of 511 Watt microwave radiation for 5 minutes (B2), chemical pre-treatment using 8 M HNO3 for 48 hours (B3), and pre-treatment with a combination of microwave radiation for 5 minutes and acid treatment using various HNO3 concentration of 2, 4, 6, and 8 M for 48 hours (B4, B5, B6, and B7, respectively). Coal particle of B1 had mesopore diameter range of 33.97 Å, while coal particle with pre-treatment have increased pore diameter, but are still in range of mesopore. The coal obtained by B3 process has the highest specific surface area and pore volume, which were 44.39 m2/g and 0.99 cc/g, respectively. The proximate and ultimate analyses showed that acid treatment reduced fixed carbon contain. Coal bio-solubilization of B1, B2, B4, and B5 by qualitative could not be solubilized and there was no black liquid as a result of solubilized coal, meanwhile, B3, B6, and B7 were solubilized easily since the first day. Bio-solubilization of chemically pre-treatment low rank coal, B3, resulted in the highest humic acid concentration and bio-solubilization percentage i.e. 186.1 mmol/L and 67.8%, respectively. Keywords: coal bio-solubilization, HNO3, microwave radiation, Neurospora intermedia. 
Uji Pengoperasian Fixed Bed Gasifier Batubara Kapasitas 100 kg/jam Suhartono; Suwito Gunadarma; Dwiwahju Sasongko; Herri Susanto
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 6 No 1 (2007): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jt.vol6no1.263

Abstract

Unit gasifikasi batubara jenis down draught kapasitas 100 kg/jam untuk mensubtitusi minyak bakar 70 liter/jam melalui proses gasifikasi, menggunakan udara-air sebagai medium penggasifikasi telah terinstalasi pada unit pengering di pabrik teh. Unit gasifiakasi terdiri dari reaktor gasifier, siklon, pendingin, kock out drum, blower dan burner. Gas produser stabil terbakar di burner, tetapi hanya mampu membuat udara panasdi unit pengering teh hingga 92oC (suhu target 100oC 120oC). Diperkirakan tidak tercapainya suhu target disebabkan kapasitas gasifier kurang besar, sehingga gas produser yang disuplai kurang dan pembakaran di burner selalu dalam ekses udara yang tinggi. Beberapa faktor gasifikasi yang diperkirakan mempengaruhi proses, antara lain: a. batubara pecah menjadi partikel lembut, menyebabkan penurunan tekanan yangmenghambataliran, hambatan aliran di ruang reduksi terjadi akibat pelelehan abu, menyebabkan penyumbatan aliran maupun penutupan arang, sehingga sulit bereaksi, c.kandungan tar masih banyak, karena tidak adanya scrubber yang dipasang di depan pendingin. Untuk menurunkan temperatur proses gasifikasi yang masih tinggi dan pelelehan abu diatasi dengan air yang disemburkan dalam bentuk kabut (spray) dalam daerah oksidasi melalui pemasangan pocker, penguapan air menyebabkan produksi hidrogen tinggi. Modifikasi lanjut difokuskan pada reaktor gasifikasi berupa perombakan throat (zona reduksi) untuk menurunkan temperatur proses dan meningkatkan pasokan gas hasil.
Model Validation of Biomass-Coal Blends Co-Pyrolysis to Produce Hybrid Coal Aghietyas Choirun Az Zahra; Hendi Aviano Prasetyo; Jenny Rizkiana; Winny Wulandari; Dwiwahju Sasongko
Indonesian Journal of Energy Vol 2 No 2 (2019): Indonesian Journal of Energy
Publisher : Purnomo Yusgiantoro Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33116/ije.v2i2.41

Abstract

Co-pyrolysis of coal and biomass blend to produce hybrid coal has recently been experimentally studied by some previous researchers. For similar generated energy, a newly developed hybrid coal is claimed to be more environmentally friendly compared to the coal only due to the release of neutral CO2. To acquire a better understanding of co-pyrolysis of coal and biomass blend, an experiment had been carried out in a tubular furnace reactor. For this purpose, the blends of constant mass composition of 20 wt% sawdust and 80 wt% low-rank coal were used throughout the study. It was found from the experiment that approximately 42.1% carbon, and 1.6% of ash were produced from the co-pyrolysis blend. Then, a steady state simulation of co-pyrolysis was developed using Aspen Plus v8.8 to predict the hybrid coal carbon content and required heat to perform the co-pyrolysis. The model simulation showed that hybrid coal yielded 44.0% carbon, which was at 4.5% deviation from the experimental study. The model had also been successfully used to estimate heat required to produce hybrid coal. It predicted that the equivalent heat of 336.2 kW was required to produce hybrid coal from 1,000 kg/h blend feed. The heat generated by the modeling of sawdust biomass combustion for fuel purposes was also estimated to supply heat for endothermic co-pyrolysis. It was found that 1,000 kg/h sawdust was predicted to be equivalent to 371.4 kW. This suggests that for scaling up purpose, ratio of sawdust fuel to blend feed of 1:1.1 is sufficient for this process.
Studi Pengaruh Konsentrasi Katalis ZnO untuk Degradasi Limbah Palm Oil Mill Effluent (POME) Menggunakan Teknologi Fotokatalitik Farizky Wahyudi; Wibawa Hendra Saputera; Dwiwahju Sasongko; Hary Devianto
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 22 No 2 (2023): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55893/jt.vol22no2.549

Abstract

Indonesia is among the world’s largest palm oil market countries leading to significant growth in the domestic palm oil industry. However, the increase in palm oil trading has also led to a rise in the production of waste known as Palm Oil Mill Effluent (POME). Currently, the majority of factories use open ponds for POME processing, but this method is considered ineffective for treating POME. To address this issue, researchers are exploring photocatalytic technology, which utilizes light energy (UV, visible, sunlight) to produce radical compounds that act as oxidizing agents for POME degradation. In this study, ZnO was employed as a catalyst. The XRD and UV-vis DRS characterizations confirmed that ZnO had a hexagonal wurtzite crystal structure with a band gap energy of 3,22 eV. The photocatalytic activity test results revealed that using 0.5 g/L ZnO catalyst proved to be efficient in degrading organic content in POME. The percentage of chemical oxygen demand (COD) degradation reached 22.85%, color degradation reached 48.53% and the reaction rate kinetics constant of COD degradation was at 2.6´10-3 min-1.
Co-Authors Aghietyas Choirun Az Zahra Elvi Restiawaty Farizky Wahyudi Hary Devianto Hendi Aviano Prasetyo Herri Susanto Jenny Rizkiana Nendry Nurramdani Solihah Suhartono Suwito Gunadarma Wibawa Hendra Saputera Winny Wulandari