Asri Gani
Department of Chemical Engineering, Faculty of Engineering, University of Syiah Kuala, Banda Aceh 23111, Indonesia

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MICROBIAL COMMUNITY ANALYSIS DURING START-UP OF ANAEROBIC CO-DIGESTION BASED ON QUINONE PROFILES USING SUPERCRITICAL FLUID EXTRACTION Gani, Asri; Fall, Ahmed; Daimon, Hiroyuki
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

Quinone profile is well known as a useful tool for the analysis of microbial community dynamics in mixed cultures in terms of quantification, simplicity, and reproducibility. The application of quinone profile method in anaerobic digestion is to monitor and overcome instability during fermentation process. A lab-scale anaerobic digestion treating a mixture of milk cow manure (CM) and simulated food waste (FW) during start-up process at mesophilic conditions was used to monitor the change of microbial community dynamics and stability. Supercritical fluid extraction (SFE) experiments using CO2 and ultra-high performance liquid chromatography (UPLC) was applied for extract and determination of ubiquinones (UQ) and menaquinones (MK) species. Quinone can be a helpful tool to make the link between microbial community and anaerobic digestion parameters in order to overcome digester instability during the start-up process.
PENGARUH PENAMBAHAN KAOLIN TERHADAP REDUKSI LOGAM PB PADA PROSES PEMBAKARAN BATUBARA Is, Isdawani; Gani, Asri
Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 3 (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 (422.657 KB) | DOI: 10.23955/rkl.v10i3.3064

Abstract

Adsorpsi emisi pembakaran briket batubara dengan menggunakan adsorben kaolin telah dilakukan. Penelitian ini bertujuan untuk melihat pengaruh rasio adsorben terhadap performa penyerapan SO2 dan logam berat plumbum (Pb). Kaolin dicampur dalam briket batubara dengan variasi massa 2, 4, 6, 8, dan 10%. Briket dibakar pada electrically stainless steel reaction tube pada kondisi temperatur pembakaran yaitu 600, 700, dan 800oC. Analisis kadar pb dilakukan dengan menggunakan atomic absorbtion spectroscopy (AAS) Perkin Elmer. Konsentrasi emisi SO2 dalam gas buang dianalisis menggunakan industrial gas combustion and emission analyzer (E4400i). Hasil percobaan dan analisis menunjukkan, bahwa tingginya rasio adsorben dapat menurunkan trend emisi SO2 yang dihasilkan. Pada emisi logam tingkat kejenuhan penyerapan oleh kaolin berada pada rasio adsorben 6%-10%. Kapasitas adsorpsi yang dihasilkan cenderung tinggi pada suhu pembakaran 600oC.
Analisis Karakteristik Emisi Gas Buang Pada Sarana Transportasi Roda Dua Kota Banda Aceh Jalaluddin, -; Gani, Asri; Darmadi, -
Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
Publisher : Jurnal Teknik Mesin Unsyiah

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Abstract

The study was conducted to measure exhaust emissions and describe the level of air pollution from motorcycles operating in Banda Aceh and and surrounding areas. The measurement of exhaust emissions is done when the engine starts with the average gas pressure between 3000 - 4000 rpm and the motorcycle is in  stationary condition, as well as air conditioning in the cabin is off. The measurement parameter is Carbon Dioxide CO2 ( % ) , Carbon Monoxide CO ( mg/m3 ) , Nitrogen Dioxide NO2 ( mg/m3 ) , and Sulful Dioxide SO2 ( mg/m3 ) and the emission gauge used is Quintox flue Gas Analyzer. Based on the results of the study of the level of CO2 produced by motorcycles of various cylinder capacities are 12 % below quality standards. The level of O2 generated in the combustion process of the motorcycles is far above 2% and 1050mg/m3 of SO2. The level of SO2 exshausted is 2% above the quality standard of SO2 set in the Regulation of the Minister of  Environment , which is 800 mg/m3.
QUALITY IMPROVEMENT ON BRIQUETTES MADE OF OIL PALM EMPTY FRUIT BUNCHES (EFB) USING OF BROWN ALGAE ADHESIVE Dewita, Ana; Faisal, M.; Gani, Asri
Jurnal Rekayasa Kimia & Lingkungan Vol 15, No 1 (2020): 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 (393.778 KB) | DOI: 10.23955/rkl.v15i1.15429

Abstract

The charcoal produced from oil palm empty fruit bunches pyrolysis can be utilized as environmentally friendly alternative fuel briquettes. This research aimed at improving the quality of these EFB briquettes using brown algae adhesive (alginate). The adhesive was added at 2.5%, 5%, 7.5%, and 10%. Proximate analysis was then performed on EFB and the brown algae. The best quality briquettes were obtained by adding brown algae adhesive at 2.5% concentrate, which resulted in a calorific value of 21,405 J/g. Other characteristics such as moisture content, ash content, volatile matter, and fixed carbon were found to be 7.4%, 4.9%, 79%, and 8.7%, respectively. In addition, the thermal characteristics such as density, flash point, and burning time were found at 0.96 g/cm3, 5.1 second, and 300 minutes, respectively.
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.
GASIFICATION AND CO-GASIFICATION LOW-RANK COAL WITH BIOMASS Gani, Asri; Naruse, Ichiro
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering
Publisher : Syiah Kuala University

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Abstract

Recently, there has been significant research interest in cogasification of coaland various types of biomass blends to improve biomass gasification and syngasproduction. In addition, ash present in biomass catalyses the gasification of coal. This experiment was conducted on the cogasification of various types of coal and biomass using drop tube gasifier under two sets temperatures 1173 and 1273K respectively. Most of the reactions are considered as endothermic, the heat input is needed to conduct the reactions. The additions of biomass to NL coal during co-gasification give no effect on gasification, since the reaction is endothermic. The increasing temperature from 1173 to 1273K only give small increase in the yield gas and efficiency due to the short of residence time
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
KARAKTERISTIK PEMBAKARAN BATUBARA PERINGKAT RENDAH, CANGKANG SAWIT DAN CAMPURANNYA DALAM FLUIDIZED BED BOILER Mahidin, Mahidin; Khairil, Khairil; Adisalamun, Adisalamun; Gani, Asri
Reaktor Volume 12, Nomor 4, Desember 2009
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (182.095 KB) | DOI: 10.14710/reaktor.12.4.253 – 259

Abstract

Penggunaan biomassa di unit pembangkit tenaga listrik sudah banyak dilaporkan oleh banyak peneliti dan praktisi. Tetapi, data untuk pembakaran cangkang sawit baik sebagai bahan bakar utama maupun pendamping sangat terbatas. Dalam studi ini, karakteristik pembakaran batubara peringkat rendah, cangkang sawit dan campurannya dalam fluidized bed boiler sudah dipelajari. Pada pembakaran batubara/cangkang sawit parameter pembakaran seperti konsentrasi gas, temperatur unggun dan efisiensi pembakaran dikaji terhadap efek udara berlebih (rasio udara/bahan bakar) dan ukuran partikel. Dalam pembakaran campuran, parameter-parameter tersebut dikaji terhadap pengaruh udara berlebih dan komposisi bahan bakar. Hasil percobaan menunjukkan bahwa efisiensi pembakaran maksimum untuk pembakaran batubara didapatkan pada udara berlebih tinggi (50%) dan ukuran partikel kecil (60+ mesh). Sedikit perbedaan teramati pada temperatur unggun dimana nilai maksimum muncul pada udara berlebih rendah (30%) tetapi ukuran partikel sama. Seperti yang diharapkan, fenomena yang sama juga terjadi untuk pembakaran cangkang sawit. Lebih lanjut, pada pembakaran campuran efisiensi pembakaran maksimum juga terjadi pada udara berlebih tinggi (50%) dan rasio bahan bakar (% berat) 50:50 untuk ukuran partikel 60+ mesh. Sama halnya dengan pembakaran batubara, temperatur unggun maksimum juga terlihat pada udara berlebih 30% dan rasio cangkang/batubara 20:80.
Desulfurisasi dan Penyerapan Merkuri secara Simultan dari Batubara Peringkat Rendah (Aceh Barat) untuk Aplikasi Power Plant dengan Adsorben Zeolit Wattimena, Yuanda; Gani, Asri; Riza, Medyan
Jurnal Teknologi Kimia Unimal Vol 7, No 1 (2018): Jurnal Teknologi Kimia Unimal
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jtku.v7i1.1171

Abstract

Adsorpsi emisi pembakaran batubara dengan menggunakan adsorben zeolit pada jenis briket dan pulverized telah dilakukan. Penelitian ini bertujuan untuk mengurangi emisi gas SO2 dan logam Hg yang berbahaya apabila rilis di udara bebas dengan cara menggunakan adsorben zeolit untuk kecendrungan emisi menjadi bottom ash yang lebih terkendali. Pengujian ini fokus mengevaluasi rasio optimal rasio adsorben terhadap jumlah batubara terhadap performa penyerapan, sehingga penggunaannya tidak mengurangi nilai bakar batubara. Prosedur pembakaran ekspremintal awal dimulai dari pencampuran batubara dan zeolit dengan rasio 4%, 6%, 8%, 10%  dan 12%  yang dibagi dalam bentuk briket dan pulverized. Kedua jenis sampel dibakar secara berurutan pada electrical stainless steel reaction tube furnace pada kondisi temperatur pembakaran Fludized Bed Coal Combustion yaitu 600oC, 700oC, dan 800oC dengan laju alir udara disesuaikan. Flue gas hasil pembakaran yang keluar dari outlet dianalisa menggunakan Gas Combustion and Emission Analyzer (E4400, E-Instrument). Logam Hg yang yang diserap oleh zeolit pada Bottom Ash dianalisa menggunakan NIC Mercury SP Anlayzer. Hasil pengujian menunjukan kinerja zeolit terhadap kapasitas penyerapan logam Hg untuk pembakaran batubara pulverized pada temperatur pembakaran  600oC, 700oC dan 800oC masing-masing didapat pada angka 33,6, 19,25 dan 9,97 ppb/gr serta pada pembakaran briket batubara  masing-masing didapat sebesar 59,83, 37,8 dan 24,22 ppb/gr. Secara simultan untuk mengurangi emisi SO2 dan logam berat Hg pada fly ash untuk temperatur pembakaran Fludized Bed Coal Combustion rasio optimum berkisar antara 6%-8% adsoben zeolit dari jumlah massa batubara Kaway XVI Kabupaten Aceh Barat. Kata kunci:adsorpsi,  fluidized bed combustion, zeolit, briket, pulverized
Karakterisasi Sifat-Sifat Arang Kompos dari Limbah Padat Kelapa Sawit (Elaeis guinensis Jack) Characterization of Compost Charcoals Properties from Oil Palm Solid Waste Erlidawati, Erlidawati; Haji, Abdul G; Mara, M. Nasir; Gani, Asri; Edi, Sarwo; Sari, Diana I
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 7, No 2 (2009): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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Abstract

Oil palm solid waste especially fruit and empty bunches are hard to decompose naturally in the environment because fruit bark still contains oil and empty bunches contain cellulose, hemicelluloses and lignin with relatively similar levels. In this research, the quality of compost charcoals from raw materials of oil palm solid waste was studied.Oil palm empty bunches were pyrolized in a drum reactor at optimum temperature. Charcoals were milled and mixed with oil palm fruit bark to make compost charcoals by using biodecomposer Dobura1 and EM-4. Compost charcoals were characterized and their qualities were compared with the organic waste compost in accordance with SNI-19-7030-2004.The production of compost charcoals in all treatments in this research indicated that the fluctuating temperatures were changes especially in the first day and in the second day until the fourth day, decreased gradually and then rose again slowly. pH values in all treatments showed a very sharp increase in the first day, except for control that were rose up to the second day, whereas in the third day they all showed a rather sharp decrease, then in the fourth day and forth rose again slowly. The weight shrinkage of compost charcoals in all treatments occurred significantly until the sixty day. Compost charcoals that were produced in all composting treatments fulfilled the compost quality of domestic waste in accordance with SNI-19-7030-2004.