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Medyan Riza
Universitas Syiah Kuala
Religion Agriculture, Biological Sciences & Forestry Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Public Health Social Sciences Other

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OPTIMASI PARAMETER EKSTRAKSI OLEORESIN DARI AMPAS PALA MENGGUNAKAN RESPONSE SURFACE METHODOLOGY (Optimization of Extraction Parameter of Oleoresin from Nutmeg Waste through Response Surface Methodology) Darmadi, Darmadi; Riza, Medyan; Lubis, Mirna Rahmah
Jurnal Hasil Penelitian Industri Vol 28, No 1 (2015)
Publisher : Baristand Industri Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (23.353 KB)

Abstract

Optimization of extraction parameter of oleoresin from nutmeg waste has been developed.The waste could be alternative raw material of oleoresin to replace fresh nutmeg whose price is costly. Sofar, nutmeg waste from volatile oil factory is not utilized maximally. Its utilization as product that hasadditional value could be carried out by extraction method of nutmeg oleoresin. The research aims tooptimize oleoresin extraction condition (temperature, solvent amount, and particle size) from nutmegwaste by using Response Surface Methodology. The condition is designed randomly by Box-Behnkenmethod to result in 17 experiment. The effect of extraction condition toward yield and index of refractionis determined through calculation and analysis by using refractometer, respectively. The highest value ofindex of refraction in the research is 1.4852. The optimum condition to result in the highest yield14.5525% is at temperature of 40oC, solvent amount of 200 ml, and particle size of -20+30 mesh.Optimization by using the method indicates that optimum parameter is obtained at temperature of35.86oC, solvent amount of 167.13 ml, and particle size of 10 mesh. The research result is expected toprovide information on operational effectivity in the perspective of production cost that could be utilizedby production center of nutmeg oleoresin.
PRODUKSI BIODIESEL DARI MINYAK BIJI JARAK (Jatropha curcas) DENGAN MENGGUNAKAN KATALIS KALIUM HIDROKSIDA (KOH) Production of Biodiesel from Jatropha Seed (Jatropha Curcas) Oil Using KOH as Catalyst Kasturi, Kasturi; Riza, Medyan; Supardan, Muhamad Dani
Jurnal Hasil Penelitian Industri Vol 26, No 2 (2013)
Publisher : Baristand Industri Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (23.353 KB)

Abstract

Nowadays, the use of fuel as the primer source of energy has been carriedout using petroleum classified as non-renewable fossil. The product needed hassignificantly increased along with its uses in industry and transportation lastly spurringthe necessity of a new alternative source of energy. This research was aimed to obtain bestoperating condition to product biodiesel via transesterification process of jatropha seedusing 3% wt. of KOH as catalyst. Condition process of producing biodiesel were at 30, 40,50, 60 and 70C of process temperatures, 200, 300 and 400 rpm of agitation speeds, and1:12, 1:14, and 1:16 of mole ratios between jatropha seed and methanol. The result of thisresearch showed that the higher ratio between Jatropha curcas and methanol the higherbiodiesel obtained. While for the operating condition, the faster agitation speed alsoinfluenced in the more amount of biodiesel yield. Best operating temperature obtained wasat 60C. The analysis of the product including density, viscosity, acid number and flashpoint were 846 kg/m3, 5 cSt, 0,67 mg KOH/gr and 35C, respectively.
Uji Mekanik Plastik Biodegradable dari Pati Sagu dan Grafting Poly(Nipam)-Kitosan dengan Penambahan Minyak Kayu Manis (Cinnamomum burmannii) Sebagai Antioksidan Safitri, Isna; Riza, Medyan; Syaubari, Syaubari
Jurnal Litbang Industri Vol 6, No 2 (2016)
Publisher : Institution for Industrial Research and Standardization of Industry - Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (299.169 KB) | DOI: 10.24960/jli.v6i2.1914.107-116

Abstract

Nonbiodegradable plastic is packaging that can be decomposed by microorganisms so that a viable alternative to replace conventional plastic packaging that cause problems for the environment. This study was aimed to evaluate the effect of the mechanical test and others consisting of three variables and each variable consists of three  level of concentration. The first variable was additional grafting of Poly (Nipam) - chytosan consisting of 5%, 7% and 9%. The second variable was additional glycerols which were 15%, 30%, 45%. The third variable was concentrations of cinnamon oil which were 10%, 15% and 20%. This research produced a thin sheet of plastic, transparant, and elastic and it had a slightly yellowish translucent color. The tensile strength value was about 1.34-2.57MPa, 36.22-66.30% of elongation value, and 22.22% -58.82% of water absorption. Antioxidant test was performed by wrapping an apple with biodegradable plastics containing cinnamon oil. It could inhibit the growth of microorganisms. The apples changed significantly on day 8. In biodegradability test, this plastic was decomposed after buried for 56 days in the soil.ABSTRAKPlastik biodegradable adalah kemasan yang dapat diurai oleh mikroorganisme sehingga menjadi alternatif untuk menggantikan plastik kemasan konvensional yang menimbulkan permasalahan bagi lingkungan. Penelitian ini bertujuan untuk mengevaluasi pengaruh terhadap uji mekanisnya dan lain-lain yang terdiri atas tiga variabel dan masing-masing variabel terdiri dari tiga taraf kosentrasi. Variabel pertama adalah variasi penambahan grafting Poly(NIPAM)-kitosan yang terdiri dari kosentrasi 5%, 7% dan 9%.  Variabel kedua adalah variasi penambahan gliserol yang terdiri dari kosentrasi 15%, 30%, 45% dan variabel ketiga adalah variasi penambahan minyak kayu manis yang terdiri dari kosentrasi 10%, 15% dan 20%. Penelitian ini menghasilkan plastik berupa lembaran tipis, transparan, dan elastis serta memiliki warna bening sedikit kekuningan. Plastik yang dihasilkan memiliki nilai kuat tarik sebesar 1,34-2,57 MPa, elongasi 36,22- 66,30%, dan penyerapan air 22,22%-58,82%. Hasil uji antioksidan dilakukan dengan membungkus apel dengan plastik biodegradable  yang mengandung minyak kayu manis mampu menghambat pertumbuhan mikroorganisme, apel mengalami perubahan signifikan  pada hari ke 8. Pada uji biodegrabilitas plastik ini terurai dalam tanah selama 56 hari.
Sosialisasi Penerapan Protokol Kesehatan Bagi Siswa Sekolah Di Masa Pandemi Covid-19 Pada Panti Asuhan Yakesma Asmadi, Didi; Hidayaturrahmi, Hidayaturrahmi; Juwita, Juwita; Andriansyah, Andriansyah; Rahmawati, Sri; Riza, Medyan
Jurnal Pengabdian Masyarakat: Darma Bakti Teuku Umar Vol 3, No 2 (2021): Juli-Desember
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/baktiku.v3i2.3802

Abstract

Tujuan pelaksanaan kegiatan Pengabdian Kepada Masyarakat ini adalah untuk memberikan pemahaman, pengetahuan, dan kemampuan dalam pencegahan serta penularan Covid-19 bagi anak usia sekolah saat akan melaksanakan proses belajar mengajar. Adapun metode yang digunakan adalah ceramah atau penyuluhan dengan media poster tentang pentingnya penerapan protokol kesehatan yaitu mencuci tangan, memakai masker, menjaga jarak, dan menghindari kerumunan sesuai anjuran pemerintah. Sedangkan sasaran kegiatan ini adalah anak usia sekolah yang terdiri dari SMU, SMP, dan SD sejumlah 70 orang di panti asuhan YAKESMA, Aceh Besar. Hasil yang diperoleh yaitu diharapkan terbangunnya kesadaran dan peningkatan pemahaman anak usia sekolah dalam menerapkan protokol kesehatan saat akan melaksanakan belajar di sekolah dan lingkungannya
TRANSESTERIFIKASI IN SITU BIJI PANDAN LAUT (Pandanus tectorius ) MENJADI BIODIESEL MENGGUNAKAN GELOMBANG ULTRASONIK Mahlinda, M. Dani Supardan, Husni Husin, Medyan Riza
Jurnal Teknologi Industri Pertanian Vol. 26 No. 3 (2016): Jurnal Teknologi Industri Pertanian
Publisher : Department of Agroindustrial Technology, Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Biodiesel is a renewable, biodegradable, environmentally benign and efficient used for substitution fossil fuel. Screw pine seed (Pandanus tectorius) is one of promising material for biodiesel feedstock. The main purpose of this research was to evaluate the process production of biodiesel from screw pine seeds using ultrasound through in situ transesterification. The process was studied at reaction temperature sof 45, 55 and 65oC; reaction times of 60, 70, 80 and 90 minutes; methanol to seed ratiosof 15:1, 20:1, 25:1 and 30:1 (w/w); KOH catalyst concentrations of 3, 4, 5 and 6 (%-w of seed) for co-solvent (kloroform) to seed ratio of 1:1 (w/w). The experimental results showed that the maximum yield of biodiesel obtained was 86.38% at reaction temperature of 65°C, mass ratio of methanol to seed 25:1 (w/w), 5% of KOH as catalyst and 80 minutes of reaction time. Test results of physicochemical properties showed that viscosity, density and acid value conformed to the SNI 7182-2012 standard. Gas Chomatography-Mass Spectrometry analysis showed that biodiesel consisted of five fatty acid methyl esters of methyl octadec, methyl linoleate, methyl palmitate, methyl stearate and methyl oleate.Keywords: biodiesel, in situ transesterification, screw pine, ultrasound
ANALISIS PERUBAHAN KUANTITAS MATERIAL KOLOM BETON BERTULANG PADA MODEL STRUKTUR BANGUNAN GEDUNG SEDERHANA Mubarak Mubarak; Abdullah Abdullah; Medyan Riza; Yulia Hayati
Rekayasa Sipil Vol 13, No 1 (2019)
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2019.013.01.1

Abstract

The loading aspect of a building is one of the factors that varies the dimensions of building components. Differences in building site areas are also contributed to the load received by buildings, especially in terms of earthquake loads. For the Province of Aceh with relatively high levels of earthquake vulnerability, the problems of structure dimensions change that caused by earthquake need to be specified. Changes to dimensions will affect the quantity of works, and furthermore against the building price standard. This research conducted to analyze the change of material quantity caused by earthquake load changes based on indication of acceleration of spectral response. This study was conducted by developing a model of simple building structure design and load change analyzed in 8 earthquake zones. The analysis focused specifically on the structural components of reinforced concrete columns. The information obtained from the analysis explains the effect of earthquake load changes from each of the observed zones on the use of reinforcing steel materials. The same condition is also seen in the ratio of reinforcement usage per cubic meter of concrete. The changes begin to be seen when the building model is positioned on zone 14 with an acceleration of 1.19g spectrum response.
Pengujian Mekanik dan Biodegradabilitas Plastik Biodegradable Berbahan Baku Pati Bonggol Pisang dengan Penambahan Kitosan, Sorbitol, dan Minyak Kayu Manis Dewi Oetary; Syaubari Syaubari; Medyan Riza
Jurnal Serambi Engineering Vol 4: No. Edisi Khusus (Oktober 2019)
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v4i2.1423

Abstract

Biodegradable plastic is an alternative to conventional plastic which has been very difficult to degrade and causes environmental pollution. Biodegradable plastic raw materials come from plants or plant wastes, so they are easily degraded by the environment and the utilization of waste becomes more efficient. The general objective of this study is to obtain the characteristics of plastics that meet the standards by varying the concentration of the materials used. This study used Kepok banana hump starch with variations in the concentration of chitosan, sorbitol, and cinnamon oil. The variable used is the ratio of weight of starch and water (1: 5). The concentration of chitosan nanoparticles was 0.25%, 0.5%, and 0.75%, sorbitol concentrations were 2 ml, 4 ml, and 6 ml, and the concentration of cinnamon was 0%, 0.5%, and 1%. Tests carried out are tensile strength, elongation of break, water absorption, and biodegradability. The best tensile strength results are 19.6 MPa, the best elongation is 47.69%, the highest water absorption is 53.77% and the lowest is 22.63%, and the complete degradation takes the longest time of 77 days.
Desulfurisasi dan Penyerapan Merkuri secara Simultan dari Batubara Peringkat Rendah (Aceh Barat) untuk Aplikasi Power Plant dengan Adsorben Zeolit Yuanda Wattimena; Asri Gani; Medyan Riza
Jurnal Teknologi Kimia Unimal Vol 7, No 1 (2018): Jurnal Teknologi Kimia Unimal - Mei 2018
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
Uji Mekanik Plastik Biodegradable dari Pati Sagu dan Grafting Poly(Nipam)-Kitosan dengan Penambahan Minyak Kayu Manis (Cinnamomum burmannii) Sebagai Antioksidan Isna Safitri; Medyan Riza; Syaubari Syaubari
Jurnal Litbang Industri Vol 6, No 2 (2016)
Publisher : Institution for Industrial Research and Standardization of Industry - Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (299.169 KB) | DOI: 10.24960/jli.v6i2.1914.107-116

Abstract

Nonbiodegradable plastic is packaging that can be decomposed by microorganisms so that a viable alternative to replace conventional plastic packaging that cause problems for the environment. This study was aimed to evaluate the effect of the mechanical test and others consisting of three variables and each variable consists of three  level of concentration. The first variable was additional grafting of Poly (Nipam) - chytosan consisting of 5%, 7% and 9%. The second variable was additional glycerols which were 15%, 30%, 45%. The third variable was concentrations of cinnamon oil which were 10%, 15% and 20%. This research produced a thin sheet of plastic, transparant, and elastic and it had a slightly yellowish translucent color. The tensile strength value was about 1.34-2.57MPa, 36.22-66.30% of elongation value, and 22.22% -58.82% of water absorption. Antioxidant test was performed by wrapping an apple with biodegradable plastics containing cinnamon oil. It could inhibit the growth of microorganisms. The apples changed significantly on day 8. In biodegradability test, this plastic was decomposed after buried for 56 days in the soil.ABSTRAKPlastik biodegradable adalah kemasan yang dapat diurai oleh mikroorganisme sehingga menjadi alternatif untuk menggantikan plastik kemasan konvensional yang menimbulkan permasalahan bagi lingkungan. Penelitian ini bertujuan untuk mengevaluasi pengaruh terhadap uji mekanisnya dan lain-lain yang terdiri atas tiga variabel dan masing-masing variabel terdiri dari tiga taraf kosentrasi. Variabel pertama adalah variasi penambahan grafting Poly(NIPAM)-kitosan yang terdiri dari kosentrasi 5%, 7% dan 9%.  Variabel kedua adalah variasi penambahan gliserol yang terdiri dari kosentrasi 15%, 30%, 45% dan variabel ketiga adalah variasi penambahan minyak kayu manis yang terdiri dari kosentrasi 10%, 15% dan 20%. Penelitian ini menghasilkan plastik berupa lembaran tipis, transparan, dan elastis serta memiliki warna bening sedikit kekuningan. Plastik yang dihasilkan memiliki nilai kuat tarik sebesar 1,34-2,57 MPa, elongasi 36,22- 66,30%, dan penyerapan air 22,22%-58,82%. Hasil uji antioksidan dilakukan dengan membungkus apel dengan plastik biodegradable  yang mengandung minyak kayu manis mampu menghambat pertumbuhan mikroorganisme, apel mengalami perubahan signifikan  pada hari ke 8. Pada uji biodegrabilitas plastik ini terurai dalam tanah selama 56 hari.
MODIFIKASI MEMBRAN POLYETHERSULFONE (PES) MENGGUNAKAN PELARUT NORMAL METHYL PYROLYDONE (NMP) SECARA NON-SOLVENT INDUCE PHASE SEPARATION (NIPS) Umi Fathanah; Izarul Machdar; Medyan Riza; Nasrul Arahman; Mirna Rahmah Lubis; Mukramah Mukramah
Prosiding Seminar Nasional USM Vol 2, No 1 (2019): Semnas Multidisiplin Ilmu
Publisher : Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2169.298 KB)

Abstract

Clean water is a natural resource which is indispensable, due to the increase of population, water demand is also increasing. so that technology is needed in water treatment to satisfy the needs of clean water. Membrane separation technology is a technology that has grown rapidly in addressing the problems of water treatment. The purpose of this study was to determine the characteristics and performance of Polyethersulfone (PES) membranes modified with magnesium hydroxide or Mg(OH)2 and modification using chitosan. Membrane preparation was carried out by the phase inversion method, using an 18 wt% PES polymer modified with the addition of 0.2 wt% of Mg(OH)2, and modification using 0.2 wt% of chitosan. Furthermore, it was dissolved in N-Methyl pyrrolidone (NMP) as a solvent and the dope solution was stirred for 24 hours until it was homogeneous. Membrane characterization includes functional group analysis and measurement of the membrane water contact angle. Whereas membrane performance testing is done through permeability measurement and membrane rejection using a dead end ultrafiltration module. The results showed that the hydroxyl group (-OH) contained in Mg(OH)2 and chitosan were able to improve the hydrophilicity of the PES membrane. The membrane permeability coefficient modified with Mg(OH)2 gives a value of 8.236 L/m2.h.bar, while modifying the membrane using chitosan produces a value of 6.237 L/m2.h.bar. Both of them experience an increase compared to pure PES membrane without modification that has a permeability value of 4.123 L/m2.h.bar.
Co-Authors Abdullah Abdullah Agam Muarif Ahmad Fikri Ananda, Aldila Andriansyah Andriansyah Asmadi, Didi Asri Gani Aula Chairunnisak Azwar Darmadi Darmadi Dewi Oetary DS, Syahiddin Edi Munawar Eko Suhartono Fauzan Al Chalifa Ghazi Mauer Idroes Hasanuddin, Iskandar Hidayaturrahmi, Hidayaturrahmi Hisbullah Hisbullah Isna Safitri Izarul Machdar Izarul Machdar Jalalul Akbar, Said Juwita Juwita, Juwita Kasturi Kasturi, Kasturi Khairan Khairan Lia Ernita Mirna Rahmah Lubis Mubarak Mubarak Muhamad Dani Supardan Muhammad Subhan Mukhlishien Mukhlishien, Mukhlishien Mukramah Mukramah Mukramah Yusuf Mukramah Yusuf Wahab Mulyati, Sri Nasrul Arahman Nasrul Arahman Nasrul Arahman Nissa Prasanti Novi Sylvia Prasetio, Rasi Rahayu Retnowulan, Sri Ridwandi Rozanna Dewi Safitri, Isna Sentia, Prima Denny Sri Rahayu Retnowulan Sri Rahmawati Suhendrayatna Suhendrayatna Syahiddin DS Syamsul Arifin Syaubari Syaubari Syaubari syaubari Syawaliah Muchtar Umi Fathanah Yuanda Wattimena Yulia Hayati Zuhri, Sarika Zulnazri, Z