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Kapasitas Adsorpsi Bentonit terhadap Sulfur dan Merkuri secara Simultan pada Pembakaran Batubara Yusran, Alhamidi; Supardan, Muhammad Dani; Mahidin, Mahidin
Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 4 (2015): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (605.322 KB) | DOI: 10.23955/rkl.v10i4.3309

Abstract

Pemanfaatan batubara sebagai sumber energi melalui pembakaran langsung akan menghasilkan emisi gas, partikulat trace metal (logam berat) dan abu (terutama abu terbang) yang akan mencemari udara. Penanganan terhadap pencemaran tersebut merupakan hal yang sangat mendesak. Dalam studi ini ditawarkan penyelesaian secara simultan terhadap emisi SOx dan partikulat logam berat merkuri pada pembakaran batubara peringkat rendah yang ada di Aceh melalui penyerapan menggunakan bentonit alam yang juga terdapat di Aceh (juga di daerah lain di Indonesia). Penggunaan bentonit dapat mengurangi emisi gas SO2 dan partikulat trace metal Hg dalam gas buang dan abu terbang. Bentonit dapat meningkatkan afinitas atau gaya tarik menarik antara Hg dan mineral-mineral dalam bentonit dan sekaligus menurunkan afinitas Hg terhadap S atau SO2. Konsentrasi bentonit dalam kajian ini, tanpa kalsinasi dan langsung dicampur dalam batubara, adalah 0 – 16% dan temperatur pembakaran adalah 700 – 900oC. Hasil yang didapat menunjukkan bahwa kondisi maksimum penyerapan sulfur dan/atau SO2 serta merkuri terjadi pada kandungan bentonit 6% dan temperatur 700oC.
Modeling and Simulation on NOx and N2O Formation in Co-combustion of Low-rank Coal and Palm Kernel Shell Mahidin, Mahidin; Gani, Asri; Khairil, Khairil
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 2 (2012): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

NOx and N2O emissions from coal combustion are claimed as the major contributors for the acid rain, photochemical smog, green house and ozone depletion problems. Based on the facts, study on those emissions formation is interest topic in the combustion area. In this paper, theoretical study by modeling and simulation on NOx and N2O formation in co-combustion of low-rank coal and palm kernel shell has been done. Combustion model was developed by using the principle of chemical-reaction equilibrium. Simulation on the model in order to evaluate the composition of the flue gas was performed by minimization the Gibbs free energy. The results showed that by introduced of biomass in coal combustion can reduce the NOx concentration in considerably level. Maximum NO level in co-combustion of low-rank coal and palm kernel shell with fuel composition 1:1 is 2,350 ppm, low enough compared to single low-rank coal combustion up to 3,150 ppm. Moreover, N2O is less than 0.25 ppm in all cases.Keywords: low-rank coal, N2O emission, NOx emission, palm kernel shell
A Comparison of Energy Profile between Castilla Leon, Spain and Aceh, Indonesia Mahidin, Mahidin; Khairil, Khairil; Martin, Carmen; Villamanan, Miguel A.; Segovia, Jose J.; Chamorro, Cesar R.
Jurnal Rekayasa Kimia & Lingkungan Vol 7, No 4 (2010): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

A comparative study on energy production and consumption between Aceh, Indonesia and Castilla León, Spain has been conducted. Analysis was carried out on the statistical data such as population, GDP, energy production and energy consumption. Some interesting results were obtained. An average energy production during 2001 – 2004 in Aceh is up to 28 times of the average energy production in Castilla León; however, the average energy consumption during those four years is only 16.74% of the average energy consumption of Castilla León. Aceh's average GDP from 2001 to 2004 is 3,357.16 million Euros, stands at only 8.15% of Castilla León's average GDP about 41,175.75 million Euros.Keywords: economic growth, final energy consumption, GDP, primary energy production
Pengaruh Penambahan Biji Jarak dalam Briket Campuran Batubara Peringkat Rendah dan Cangkang Sawit (Bio-Briket) terhadap Laju Pembakarannya Mahidin, Mahidin
Jurnal Sains dan Teknologi Industri Vol 9, No 1 (2011): Desember 2011
Publisher : Fakultas Sains dan Teknologi

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Abstract

Penggunaan biomassa sebagai bahan bakar pendamping, disamping untuk mereduksi emisi gas yang dihasilkan selama proses pembakaran, juga ditujukan untuk mempermudah penyulutan awal batubara. Tujuan dari studi ini adalah untuk mengamati pengaruh kandungan perekat dan rasio bahan bakar terhadap laju pembakaran bio-briket yang dibuat dengan mencampurkan batubara peringkat rendah dan cangkang sawit. Perekat yang digunakan dalam riset ini adalah biji jarak pagar. Kandungan perekat dalam bio-briket adalah (% berat) 25, 20, 15, 10, dan 5. Rasio batubara terhadap cangkang sawit adalah (dalm berat) 90:10, 80:20, 70:30, 60:40, dan 50:50. Laju pembakaran didefenisikan sebagai combustion weight-loss ratio (CWR). Hasil pengamatan menunjukkan bahwa perubahan kandungan perekat (biji jarak) tidak memberikan efek yang signifikan terhadap laju pembakaran, tetapi rasio bahan bakar memperlihatkan pengaruh yang lebih seignifikan dimana laju pembakaran meningkat dengan meningkatnya jumlah cangkang sawit dalam bio-briket.
Karakteristik Pembakaran Beberapa Jenis Biomassa dalam Fluidized Bed Boiler Mahidin, Mahidin; Hamdani, Hamdani; Muhtadin, Muhtadin; Faisal, Muhammad; Mahyuddin, Mahyuddin
Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 1 (2014): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (692.767 KB) | DOI: 10.23955/rkl.v10i1.2167

Abstract

Pembakaran biomassa dalam rangka memproduksi energi termal untuk menghasilkan utilitas lain dapat dilakukan dengan mengkonversi energi tersebut ke bentuk energi lain. Boiler dengan unggun terfluidisasi dipilih sebagai teknologi konversi energi termal menjadi energi listrik, karena kukus yang diproduksi dapat digunakan untuk menggerakkan turbin yang dikopling dengan generator listrik. Unit dimana proses pembakaran berlangsung, yaitu ruang bakar dan freeboard dipilih sebagai target pengamatan untuk mengevaluasi kinerja boiler tersebut. Hasil pengamatan terhadap pembakaran tiga jenis biomassa, serpihan kayu ketam, kulit pinang dan ranting kayu kering, memperlihatkan bahwa masing-masing jenis biomassa memiliki karakteristik pembakaran tersendiri. Temperatur pembakaran maksimum untuk serpihan kayu ketam dan ranting kayu kering didapatkan pada waktu pembakaran 30 detik, sementara untuk kulit pinang pada 20 detik. Hasil yang sangat menarik adalah ditemukan bahwa temperatur maksimum dapat ditingkatkan dengan mengubah sistem pengumpan bahan bakar. Sistem pengumpan antara memberikan temperatur maksimum yang lebih tinggi dibanding dengan sistem pengumpan biasa.
H2 EVOLUTION ON LANTHANUM AND CARBON CO-DOPED NATAO3 PHOTOCATALYST Husin, Husni; Mahidin, Mahidin; Zuhra, Zuhra; Hafita, Fikri
Bulletin of Chemical Reaction Engineering & Catalysis 2014: BCREC Volume 9 Issue 2 Year 2014 (SCOPUS Indexed, August 2014)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.9.2.5530.81-86

Abstract

We report a carbon-modify lanthanum doped sodium tantalum oxide powders (La-C-NaTaO3) by sol-gel process. The resultant materials are characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The X ray diffraction of La-C-NaTaO3 show a single phases with a good crystallinity and without any impurity. The samples is exactly indexed as NaTaO3 monoclinic structure with the space group P2/m. The SEM measurements give a smaller particle size of doped NaTaO3 than pure NaTaO3. The effect of dopant on the photocatalytic activity of La-C-NaTaO3 in the photocatalytic of hydrogen generation is studied and compared with pure NaTaO3. The results show that the rate of hydrogen evolution over La-C-NaTaO3 is higher as compared to that of pure NaTaO3. The enhancement of photocatalytic activity of La-C-NaTaO3 nanocrystalline is mainly due to their capability for reducing the electron hole pair recombination. The La-C-dopant is believed to play a key role in the enhancement of photocatalytic properties of La-C-NaTaO3 crystalline.Submitted: 28th September 2013; Revised: 16th February 2014; Accepted: 28th February 2014[How to Cite: Husin, H., Mahidin, M., Zuhra, Z., Hafita, F. (2014). H2 evolution on Lanthanum and Carbon co-doped NaTaO3 Photocatalyst . Bulletin of Chemical Reaction Engineering & Catalysis, 9 (2):81-86. (doi:10.9767/bcrec.9.2.5530.81-86)][Permalink/DOI: http://dx.doi.org/10.9767/bcrec.9.2.5530.81-86] 
Physical Characterization and Desulfurization of Biobriquette Using Calcium-Based Adsorbent Mahidin, Mahidin; Gani, Asri; Khairil, Khairil
Makara Journal of Technology Vol 15, No 2 (2011)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (192.261 KB) | DOI: 10.7454/mst.v15i2.220

Abstract

Combustion of coal and co-combustion of their co-fuel contribute to gas emissions. Among the gas emissions are SOx, NOx, CO and CO2. Introduction of calcium based adsorbent is addressed to absorb SO2 that release to the atmosphere during the combustion process. Objective of the research is at first to observe the physical characteristics of biobriquettes as a function of briquette compositions (coal to palm kernel shell ratios) and Ca/S ratios (Ca in adsorbent and S in briquette) using a natural adsorbent (shellfish waste). The second objective is to investigate desulfurization characteristics as a function of Ca/S ratios and desulfurization temperatures at coal to palm kernel shell ratio of 90:10 (wt %). Ratios of coal to palm kernel shell in this study are 90:10, 80:20, 70:30, 60:40 and 50:50; and Ca/S ratios are 1:1, 1.25:1, 1.5:1, 1.75:1 and 2:1. Binding agent used is the mixture of Jatropha curcas seeds and starch as much as 10% (wt). It was found that introducing the palm kernel shell and adsorbents in the coal briquette affect the water resistant and compressive strength. The highest water resistance and compressive strength were 5,165 second and 34 kg/cm2, respectively. The lowest SO2 level found in this study was 1 ppm for all Ca/S ratios, except for 1:1.
CDM Potential in Palm Solid Waste Cogeneration as an Alternative Energy in Aceh Province Mahidin, Mahidin; Machdar, Izarul; Faisal, Muhammad; Nizar, Muhammad
Makara Journal of Technology Vol 16, No 2 (2012)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (124.354 KB) | DOI: 10.7454/mst.v16i2.252

Abstract

Empty Fruit Bunch (EFB) as a solid waste in Crude Palm Oil (CPO) industry does not utilized yet as an alternative energy source to generate electricity. It is well known that use of solid wate (biomass) as an energy source is part of the Clean Development Mechanism (CDM) scheme due to direct reduction of Green House Gases (GHGs) emission and provide a direct contribution to sustainable development. Utilization of EFB as a source of energy is very potential to be implemented in Aceh since this province has 25 CPO Mills at the moment which actively produce about 870,000 ton EFB per year. This study is subjected to evaluate the potency of electricity  from EFB theoretically by using primary data (survey data) and secondary data. Potency of EFB and number of electricity produced from that EFB are estimated using primary data and direct combustion scenario, respectively. Calculation methods for emission reduction acieved are done by AMS-I.D: Renewable electricity generation to the grid and AMS-III.E: Methane emissions avoided from dumping at a solid waste disposal site. The result of this investigation shows that energy consumption in 25 CPO Mills is 45 GW(e)h per year. Evidently, the number of energy/electricity which is potential to be produced by using 75% EFB is 1,047 GWh per year; so that the GHGs emission reduction up to 171,232.21 tCO2e per year.
KAJIAN PENAMBAHAN SELULOSA MIKROBIAL NATA DE COCO DAN ZAT ADITIF TERHADAP SIFAT FISIK KERTAS BATANG PISANG ABAKA (Study of The Addition of Microbial Cellulose Nata de Coco and Additives towards Physical Characteristics of Abaca Banana Stem Based Paper) Fitriani, Fitriani; Mahidin, Mahidin; Said, Syahiddin Dahlan; Busthan, Meuthia
Jurnal Hasil Penelitian Industri Vol 29, No 2 (2016)
Publisher : Baristand Industri Banda Aceh

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Abstract

Utilization of cellulose derived from wood as a raw material for pulp and paper inIndonesia increases gradually. This condition leads to deforestation in Indonesia and causes various sideeffects on the environment. The objective of this research is to study the effect of the addition of microbialcellulose nata de coco and additives towards physical characteristics of abaca banana stem paper byusing Peroxide Alkaline Pulping (APP) method. The combination of microbial cellulose pulp nata de cocoand banana stem pulp ratio of 0:100 ; 25:75 ; 50:50 ; 75:25 ; 100:0 and the addition of additives to themix the pulp with variations (b/b): without additives, tapioca (1%, 3% and 5%) and kaolin (5%, 10%, and15% used in the process of forming a sheet of paper. The results showed the addition of a bit of microbialpulp cellulose and pulp stems of the banana abaca could improve the physical strength of paper withgrammage 157.13 gr/m², a thickness of 0.0058 mm, water content of 4.48%, water absorption of 22.21%,tensile resistance 5 kN/m and elongation of 38.59%.
IMPLEMENTASI MODEL PROBLEM BASED LEARNING TERHADAP KREATIVITAS PESERTA DIDIK PADA MATERI LAJU REAKSI DI SMAN 4 BANDA ACEH Oktaviani, Coryna; Nurmaliah, Cut; Mahidin, Mahidin
Jurnal Pendidikan Sains Indonesia Vol 5, No 1 (2017): April 2017
Publisher : Program Studi Magister Pendidikan IPA Program Pascasarjana Unsyiah

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Abstract

Tujuan dari penelitian ini untuk mendeskripsikan kreativitas peserta didik setelah diimplementasikan model PBL pada materi laju reaksi. Proses pengumpulan data dilaksanakan pada semester ganjil dari tanggal 12 sampai 26 Oktober 2016 di SMAN 4 Banda Aceh. Metode yang digunakan berbentuk pre-experimental dengan one-group pretest-posttest design pada peserta didik kelas XI IA-5 yang berjumlah 26 orang secara purposive sampling. Instrumen berupa lembar penilaian kreativitas peserta didik yang dianalisis menggunakan rumus perbandingan diterapkan dalam tindakan ini. Berdasarkan hasil data, diperolehlah tingkat kreativitas peserta didik sebesar 92 (kategori sangat baik). Dengan demikian, bagi peneliti lanjutan dapat disarankan mampu melakukan pengembangan bentuk kreativitas lainnya pada peserta didik