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All Journal International Journal of Advances in Applied Sciences International Journal of Renewable Energy Development SPEKTRUM INDUSTRI Jurnal Bahan Alam Terbarukan CHEMICA Jurnal Teknik Kimia Eksergi: Chemical Engineering Journal Prosiding Semnastek IJEMS (Indonesian Journal of Environmental Management and Sustainability) Sains Natural: Journal of Biology and Chemistry Equilibrium Journal of Chemical Engineering PROSIDING SEMINAR NASIONAL PENELITIAN DAN PENGABDIAN KEPADA MASYARAKAT (SNPPM) UNIVERSITAS MUHAMMADIYAH METRO Prosiding Seminar Nasional dan Call Paper STIE Widya Wiwaha Indonesian Journal of Chemical Engineering Jurnal Teknologi dan Inovasi Industri
Martomo Setyawan
Universitas Ahmad Dahlan
Religion Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics Public Health

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Manufacture of Industrial Scale Bagasse Biochar: Effect of Temperature And Residence Time And Biochar Characterization Jaka Kuncara; Martomo Setyawan; Dhias Cahya Hakika
Equilibrium Journal of Chemical Engineering Vol 8, No 2 (2024): Volume 8, No 2 December 2024--Online First
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v8i2.95545

Abstract

Abstract. Bagasse is a waste that can still be utilized, one of which is processed into biochar. In this study, bagasse waste came from a sugar factory in Majalengka, Cirebon, West Java. The bagasse pyrolysis process was carried out at PT XXX biochar factory located in the area. Industrial scale biochar production is done by Rotary Carbonization Furnace. The research objective was to characterize biochar with variable residence time and pyrolysis temperature. Biochar was characterized based on physicochemical properties and surface composition analysis for use as a soil improver and adsorbent. The test results show that residence time and pyrolysis temperature affect biochar products. Physical characterization showed that the pyrolysis residence time of 24.73 minutes with a temperature of 400 oC gave biochar results with pH (8.92), c-organic (24.15%), total N (0.2%), P2O5 (0.17%) and high C/N ratio (1,208.00). This biochar has good quality for application as a soil improver, especially in increasing carbon storage capacity and improving soil pH. The high C/N ratio and low nitrogen content require alloying with other sources to increase nitrogen and phosphorus and lower the C/N ratio. Chemical characterization by BET test showed that pyrolysis residence time of 24.73 min at 400 oC gave the best results in terms of increasing surface area (0.554 m²/g) and pore volume (0.00364 cc/g), making it the optimal temperature to produce biochar with high adsorption capacity. Surface characterization by SEM-EDX mapping analysis showed that the pyrolysis residence time of 24.73 min at 400 oC gave results with relatively high composition of carbon (82.17%), oxygen (14.89%), silica (1.97%), potassium (0.42%), and made it more effective for soil conditioner applications.Keywords: Bagasse, Biochar, Pyrolysis.
KARAKTERISTIK REAKTOR HIDROGENASI MINYAK BIJI KAPUK UNTUK PEMBUATAN GREEN DIESEL Siti Salamah; Martomo Setyawan
Spektrum Industri Vol. 11 No. 1: April 2013
Publisher : Universitas Ahmad Dahlan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/si.v11i1.1637

Abstract

Green diesel merupakan salah satu solusi mengatasi kebutuhan bahan bakar diesel yang semakin meningkat, green diesel merupakan minyak diesel yang berasal dari hidrogenasi minyak nabati yang memiliki kualitas lebih baik dibandingkan biodiesel dan ramah lingkungan. Proses hidrogenasi minyak nabati menjadi green diesel dirancang di reaktor yang beroperasi pada suhu 250 0 C dan tekanan 10 atm, untuk beroperasi pada suhu dan tekanan tersebut maka perlu diketahui karakter reaktor juga suhu pemanasnya. Penelitian ini dilakukan dengan merancang reaktor hidrogenasi dan merancang pemanas reaktor juga uji temperatur pemanas.Pemanas listrik disambungkan dengan regulator tegangan, termokopel dipasang pada batu penahan panas tepat di atas elemen pemanas. Regulator diputar pada tegangan 100 volt, perubahan suhu dicatat tiap 5 menit, percobaan dihentikan apabila suhu sudah konstan , percobaan diulangi untuk tegangan 125,150,175,200 dan 225 volt. Percobaan diulang untuk mempelajari karakter perpindahan panas ke reaktor. Hasil dari penelitian ini adalah reaktor hidrogenasi dirancang dari bahan stainless steel, beroperasi pada temperatur 250 0 C dengan tekanan 10 atm, Spesifikasi reaktor sebagai berikut : volume cairan 2 liter, tinggi reaktor 31 cm, diameter luar 15 cm dan diameter dalam 10 cm. Reaktor tabung ini dilihat dari persyaratan suhu dan kebutuhan panas dapat digunakan sebagai reaktor untuk hidrogenasi minyak biji kapuk. Pemanasan di reaktor dapat mencapai suhu 2400 C dengan menggunakan tegangan 175 Volt. . Kata kunci : Karakteristik , Reaktor hidrogenasi , Green diesel
Pembuatan Arang Aktif dari Tempurung Kelapa dan Aplikasinya untuk Penjernihan Asap Cair Siti Jamilatun; Martomo Setyawan
Spektrum Industri Vol. 12 No. 1: April 2014
Publisher : Universitas Ahmad Dahlan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/si.v12i1.1651

Abstract

Arang aktif merupakan senyawa karbon amorph, yang dapat dihasilkan dari bahan-bahan yang mengandung karbon atau dari arang yang diperlakukan dengan cara khusus untuk mendapatkan permukaan yang lebih luas. Arang aktif dapat mengadsorpsi gas dan senyawa-senyawa kimia tertentu atau sifat adsorpsinya selektif, tergantung pada besar atau volume pori-pori dan luas permukaan.. Arang aktif akan dibuat dari arang hasil pirolisis tempurung kelapa.dan diimplementasikan untuk menjernihkan asap cairnya. Adapun langkah yang pertama membuat arang aktif dari tempurung kelapa adalah, membuat arang tempurung kelapa dengan membersihkan tempurung kelapa terlebih dahulu dari bahan-bahan pengotor seperti tanah, kerikil. Kemudian mengeringkannya dibawah sinar matahari, selanjutnya membakar tempurung kering pada drum/bak pembakaran dengan suhu 300-500 0C selama 3-5 jam. Langkah yang kedua adalah arang hasil pembakaran direndam dengan bahan kimia CaCl2 dan ZnCl2 (kadar 25 %) selama 12 sampai 24 jam untuk menjadi arang aktif. Selanjutnya melakukan pencucian dengan air suling/air bersih hingga kotoran atau bahan ikutan dapat dipisahkan. Arang aktif basah dihamparkan pada rak dengan suhu kamar untuk ditiriskan, kemudian dikeringkan dalam oven pada suhu 110 – 8000C selama 3 jam. Suhu aktivasi mempengaruhi kualitas karbon aktif yang terbentuk. Dari uji kualitas karbon aktif yang dilakukan, kualitas karbon aktif yang terbaik diperoleh pada suhu 800oC dengan kadar air 1,3 %, kadar abu 0,60 % memenuhi standar SII 0258-79 dan memiliki daya serap terhadap kadar iod sebesar 580,0 mg/g yang memenuhi standar SNI 06-3730. Penjernihan air limbah rumah tangga, air berwarna menggunakan karbon aktif dari suhu aktivasi 800oC menghasilkan air yang jernih, tidak berbau dan memenuhi pH standar air (7,0-7,5). Key words : Asap cair, tempurung kelapa, pirolisis, arang aktif
Energy efficient direct transesterification of Nannochloropsis sp. using hydrodynamic cavitation Nirmalasari, Jiran; Setyawan, Martomo; Jamilatun, Siti; Pitoyo, Joko; Hakika, Dhias Cahya
International Journal of Advances in Applied Sciences Vol 14, No 2: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v14.i2.pp394-405

Abstract

The increasingly limited supply of fossil fuels requires renewable fuel as an alternative source. Nannochloropsis sp. is a microalgae species containing a lipid content of between 12 and 53%, which can be converted to biofuel as an alternative source of fossil fuels through a transesterification process. Up to this date, the literature has reported no studies on biodiesel production from Nannochloropsis sp. via direct transesterification with catalyst using hydrodynamic cavitation. The direct transesterification process introduced 7.5 g of microalgae, 40 ml of methanol, 90 ml of hexane, and 0.0225 g of sodium hydroxide into the sample chamber. These mixtures were passed within the cavitation using a pressure driver and transformed into fatty acid methyl ester (FAME). The catalytic hydrodynamic cavitation method produces a higher extract yield than the stirring one. Regarding the FAME composition, the catalytic hydrodynamic cavitation method is dominated by saturated fatty acid (palmitic), while the stirring catalytic method is dominated by monounsaturated fatty acid (oleic). The hydrodynamic cavitation method provides a lower average degree of unsaturation and shorter chain length than the stirring catalytic method.
Characterisasion and Rate Determination of Lipid Extraction From Nannochloropsis Using Stirring Method Nirmalasari, Jiran; Setyawan, Martomo; Jamilatun, Siti; Suhendra, Suhendra; Othman, Mohamad Rizza
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i3.27752

Abstract

The rapid growth of global population causes increasing energy needs. The energy needs currently used depend on fossil fuels which are non-renewable energy sources. An alternative to solve this problem is to use renewable fuel. One alternative to reduce the use of fossil fuels is microalgae. The microalgae used in this research is Nannochloropsis sp. Because it contains quite a lot of lipids, it has the potential to be used as a raw material for making biodiesel 42.315% of the fatty acids contained in Nannochloropsis are palmitoleic. This research was conducted to determine the total lipid content and percent extraction yield. The method used in this research is mixing methods. Extraction times were 30 minutes, 60 minutes, 90 minutes and 120 minutes. The greatest total lipid content was obtained at 120 m inutes with the amount obtained being 10.46%. Meanwhile, the highest percentage of results obtained was at 120 minutes, namely 10.46%. The optimum extraction speed is in the range of 0 to 30 minutes with a speed of 0.0305% with a lipid recovery of around 90% of the lipids produced.. The research results obtained showed that the extraction time affected the results obtained in terms of total lipid content and percent yield. The longer the extraction time, the greater the lipid content and percent yield obtained.
Double step method in lipid extraction from biomass Aurantiochytrium sp powder Sulistiawati, Endah; Suhendra, Suhendra; Setyawan, Martomo; Mahsunah, Anis Herliyati
International Journal of Advances in Applied Sciences Vol 12, No 4: December 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v12.i4.pp376-383

Abstract

Aurantiochytrium sp is a marine microalgae that is rich in lipids. Extraction of lipids from microalgae requires effort to select a suitable solvent and extraction method. This research used a double-step extraction method to study a mixture of n-hexane and methanol as a solvent. The variables studied were stirring time, the n-hexane to methanol (H/M) mixture ratio, and the solvent-to-biomass ratio (S/B). This research concluded that an optimum stirring time was 30 min, and a mixture of n-hexane and methanol solvents with a volume ratio of 1:1 is optimum. The optimum solvent-to-biomass ratio was S/B=20 mL/g dry microalgae. Under these conditions, the yield of oil was 83.88%. Double-step extraction can increase the yield by 10-40%.
Optimalisasi Mutu Batubara Indonesia: Kajian Metode dan Potensi dalam Peningkatan Nilai Kalor Batubara Febriani, Annisa Vada; Hanum, Farrah Fadhillah; Kuncara, Jaka; Setyawan, Martomo
Eksergi Vol 21 No 2 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i2.11761

Abstract

Nilai kalori batubara sangat penting bagi batubara itu sendiri. Selain berpengaruh pada proses pembakaran, nilai kalori juga menunjukkan kandungan energi yang terkandung dalam batubara. Nilai kalori batubara dipengaruhi oleh beberapa parameter diantaranya ialah kelembapan, kadar abu, zat terbang, karbon tetap dan total sulfur. Namun 40% cadangan batubara di Indonesia masih kualitas rendah. Hal ini menunjukan perlu adanya teknologi peningkatan nilai kalori yang sesuai, dengan tujuan batubara kualitas rendah ini dapat digunakan secara maksimal serta mengurangi emissi CO2 yang dikeluarkan selama proses pembakaran di PLTU. Teknologi pengeringan batubara menjadi salah satu teknologi peningkatan nilai kalori batubara, dengan konsep pengurangan kadar air yang dipengaruhi oleh suhu dan tekanan. Teknologi ini terbagi menjadi empat kategori yaitu mekanis, evaporasi, non-evaporasi dan pirolisis. Sesuai dengan program hilirisasi kementrian ESDM tentang pemanfaatan batubara, teknologi yang dikembangkan dalam proses upgrading  batubara adalah teknologi UBC (Upgrading Brown Coal) dan teknologi CDB (coal dry briquette). Selain itu campuran batubara kualitas rendah dengan biomassa juga dimanfaatkan menjadi bahan bakar pembangkit listrik atau sering disebut co-firring. Baik diaplikasikan langsung maupun dibentuk menjadi briket. Program ini dijalankan untuk mendorong Program NZE pemerintah yang berkomitmen untuk mencapai nol emisi CO2 di tahun 2050. 
Pembuatan Serbuk Fikobiliprotein dari Spirulina platensis melalui Proses Freezing-Thawing dan Freeze-Drying Mazareta, Selva; Sulistiawati, Endah; Evitasari, Rachma Tia; Setyawan, Martomo; Hakika, Dhias Cahya
Eksergi Vol 21 No 3 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i3.12453

Abstract

Mikroalga golongan Cyanophyta seperti Spirulina Platensis (SP) merupakan salah satu sumber makanan fungsional yang bergizi. SP mengandung senyawa fikobiliprotein (PBP) yang merupakan komponen terbesar dari protein dan berfungsi sebagai antioksidan dan antikanker. Penelitian ini bertujuan untuk mengetahui pengaruh perbandingan solven-biomassa (S/B), waktu pengeringan beku, dan luas permukaan wadah sampel pada pengeringan beku terhadap serbuk PBP yang dihasilkan. Eksperimen diawali dengan proses perendaman SP kering (1,5 dan 3 g) selama 1 jam, pembekuan selama 24 jam, thawing, penyaringan vakum (30-90 menit) dan pengeringan beku (freeze-drying) pada filtrat yang diperoleh. Analisis konsentrasi PBP dalam filtrat dilakukan dengan mengukur absorbansinya menggunakan UV-Vis Spektrofotometer diuji pada panjang gelombang 562, 615, dan 652 nm.  Kadar air pada serbuk PBP setelah dilakukan proses freeze-drying diukur secara gravimeteri. Variasi yang dilakukan meliputi perbandingan S/B (6,67-133,33) mL air suling/g SP kering. Variasi waktu freeze drying selama 24 dan 32 jam. Waktu optimum untuk penyaringan vakum 30,55 menit dan menghasilkan konsentrasi PBP tertinggi (7,639 g/L). Nilai S/B optimum didapatkan  sebesar 20 mL/g dengan rendemen 112,32 mg/g (SP kering). Luas permukaan wadah sampel pada pengeringan beku yang terbaik adalah 427,5 cm2 dan banyaknya air yang teruapkan sebesar 99,71% dari berat filtrat
Effect of Flow Rate Ratio of Air and Waste Cooking Oil on Combustion Temperature and Furnace Efficiency Idris, M.; Setyawan, Martomo; Suharto, Totok Eka
Eksergi Vol 22 No 1 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i1.13554

Abstract

Using waste cooking oil as an alternative fuel can reduce dependence on fossil fuels and address the problem of waste oil. This study aims to analyze the effect of the flow rate ratio of air and waste cooking oil on combustion characteristics and efficiency of domestic furnace. The experiment started with fuel characterization, including density, viscosity, flash point, and calorific value tests. The combustion process was carried out by varying the fuel and airflow to the furnace. Experiments included flame temperature measurements, water boiling tests, and measurements of heat uptake efficiency by the pot water. The results showed that the highest combustion temperature of 925.55℃ was achieved at an airflow rate of 21.3 m/s with a fuel flow rate of 1.05 L/hour. The flue gas emission temperature and furnace efficiency increased as the airflow rate and fuel discharge increased. The ratio also produces the fastest water boiling time of 2 minutes with the efficiency of heat uptake by water in the pot of 34.12%. The highest heat uptake efficiency by the water in the pot was obtained at the ratio of used cooking oil discharge of 0.6 L/hour with an airflow rate of 12.1 m/s at 43.12%. These results demonstrate the potential of waste cooking oil as an alternative fuel for efficient domestic combustion devices, with proper air supply to achieve optimal combustion.
Co-Authors Adi Permadi Arief Budiman Arief Budiman Desfitri , Erda Rahmilaila Dhias Cahya Hakika Dhias Cahya Hakika Dwi Astri Ayu Purnama Endah Sulistiawati Erna Astuti Evitasari, Rachma Tia Febriani, Annisa Vada Hanin, Nabila Hanum, Farrah Fadhillah Hapsauqi, Iqbal Ibdal Ibdal Ikhlasul Amal Ilham Mufandi Ilham Mufandi Jaka Kuncara Joko Pitoyo Kuncara, Jaka Lara Arilisa K Lara Arilisa K Lutfiatul Janah M. Idris Mahsunah, Anis Herliyati Mazareta, Selva Muhammad Kunta Biddinika Muhammad Nufail Syafii Mulyono, Sekar Larasati Nirmalasari, Jiran Nisya Silvani Sembiring Novia Rahmawati Othman, Mohamad Rizza Panut Mulyono Pradana, Yano Surya Prasakti, Laras Resyaldi Pratama Rifka Alfiyani Riska Utami Melani Putri Siti Jamilatun Siti Salamah Siti Salamah Soedjatmiko Suci Fazriyah N Suci Fazriyah N Suhendra Suhendra Suhendra Sutijan Totok Eka Suharto Ulandari, Rizki Wijayanti, Karima Anggita Zahrul Mufrodi, Zahrul