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Resti Nurmala Dewi
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Jurusan Teknik Kimia Universitas Syiah Kuala, Jl. Tgk. Syech Abdur Rauf No.7, Kopelma Darussalam, Banda Aceh, INDONESIA
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JURNAL REKAYASA KIMIA & LINGKUNGAN
Published by Universitas Syiah Kuala
ISSN : 14125064     EISSN : 23561661     DOI : https://doi.org/10.23955/rkl.v18i2.34018
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Engineering
The Journal of Chemical Engineering and Environment is an open access journal that publishes papers on chemical engineering and environmental engineering. The following topics are included in these sciences: Food and biochemical engineering Catalytic reaction engineering Clean energy technology Environmental and safety technology Fundamentals of chemical engineering and applied industrial engineering Industrial chemical engineering Material science engineering Process and control engineering Polymer and petrochemical technology Membrane technology Agro-industrial technology Separation and purification technology Environmental modelling Environmental and information sciences Water and waste water treatment and management Material flow analysis Mechanisms of clean development
Arjuna Subject : Teknik Kimia (semua kategori) - Bioengineering
Articles 319 Documents
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Selective Reduction of High Alumina-Lateritic Nickel Ore (0.5 Ni-44Fe-16Al2O3) Nurjaman, Fajar; Wahyuningsih, Wahyuningsih; Karo Karo, Pulung; Ginting, Ediman; Shofi, Achmad; Handoko, Anton Sapto
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 2 (2019): Jurnal Rekayasa Kimia & Lingkungan (December, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i2.14561

Abstract

In this present study, the effect of reductant dosage, temperature and holding time on selective reduction process of high alumina-lateritic nickel ore have been investigated clearly. The lateritic nickel ore was reduced with 5 until 15 wt. % anthracite and 10 wt. % sodium sulfate at reduction temperature of 950C, 1050C and 1150C for 60, 90, and 120 minutes. Magnetic separation process was then conducted to separate the concentrate and tailing. The analysis of reduced nickel ore is performed by the Atomic Absorption Spectroscopy, X-Ray Diffraction, and Secondary Electron Microscopy. The optimal process resulted from the reduction of nickel ore with 10 wt. % anthracite at the temperature of 1050C for 120 minutes which resulted in 0.84% nickel in concentrate. The troilite was not found in reduced ore. The iron grade increased along the increased of reduction temperature. The longer of holding time in selective reduction process increased the nickel grade but it decreased the iron grade.
Product Quality of Quercetin Extract From Carica Papaya L Flower by Microwave-Assisted Extraction (MAE) Mukhaimin, Iman; Saraswati, Enggar Ayu; Ajizah, Rahma; Triyastuti, Meilya Suzan
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 2 (2019): Jurnal Rekayasa Kimia & Lingkungan (December, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i2.14598

Abstract

These work aims are to determine the best condition extraction and product quality of quercetin from Carica papaya L flowers extract. The extraction of quercetin from Carica papaya L flowers had done by microwave-assisted extraction (MAE) method. Dried flowers prepared by cutting into 0,125 mm of particle size. Dried flowers were extracted using methanol 80% (w/w) to determine influence of solid to liquid, S/L, ratio (1:10, 1:15, 1:20), microwave power (120, 200, 280, 400 W), and extraction time (1-5 minutes) on extraction process. Using the phytochemical test by Mg-HCl-amyl alcohol and UV-Vis spectrophotometer techniques, the quercetin detected by qualitative and quantitative analysis. As a result, the presence of flavonoids detected by the formation of a brownish red-colored flavylium compound. Increasing extraction time, power, and S/L ratio increased the extraction temperature. Consequently, yield quercetin decreased when the temperature extraction exceeds its temperature degradation. The highest quercetin yield, 0.214%, was detected with solid to liquid ratio (1:15), microwave power (400 Watt), and extraction time (4 minutes). FTIR spectrophotometer technique on the highest yield quercetin proved that have product quality with 91,17% similarity on group function like OH, C=O, C=C, and C-H with quercetin standard spectrum.
Application of Recycle System on a Cocoa Pod Husks Gasification in a Fixed-Bed Downdraft Gasifier to Produce Low Tar Fuel Gas Pranolo, Sunu Herwi; Waluyo, Joko; Prasetiyo, Jenni; Hanif, Muhammad Ibrahim
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 2 (2019): Jurnal Rekayasa Kimia & Lingkungan (December, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i2.14160

Abstract

Biomass gasification is potentially generating not only producer gas but also tarry components. Practically, the gas may substitute traditional fuel in an internal combustion engine after reducing the tar. This research examined a producer gas recycle system to reduce tar component of producer gas generated with cocoa pod husks gasification using air as gasifying agent in a fixed-bed downdraft gasifier. Cocoa pod husks feed sizes were +1 sieve, -1+ 0.5 sieve, and -0.5 sieve. The gasification process was operated at the temperature range of 491 940oC and at various gasifying agent volumetric rates of 62.84; 125,68; and 188.53 NL/min or at equivalent ratio range of 0.014 0.042. A recycle system of outlet producer gas to gasifier was set at volumetric rates of 0.139; 0.196; and 0.240 L/min. The performance of the system was evaluated with analyzing the tar component using gravimetric method of ASTM D5068-13, and the gas component of CO, H2, CO2 and CH4 compositions in producer gas were analyzed using Gas Chromatography GC-2014 Shimadzu sensor TCD-14. This recycle system succeeded in reducing tar content as much as 97.19% at 0.139 L/min of recycle volumetric rate and at biomass feed size of -1+0.5 sieve. The producer gas contained CO, H2, CO2 and CH4 of 23.29%, 2.66%, 13.30%, and 14.18% respectively. The recycle system cold gas efficiency was observed 65.24% at gasifying agent volumetric rate of 188.53 L/min and at biomass feed size of +1 sieve.
The Treatment of Hospital Wasterwater Electrocoagulation Using Iron Electrodes: Analysis by Response Surface Methodology M. Yusuf, Darmadi; Lubis,, Mirna Rahmah; Adisalamun, Adisalamun
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 2 (2019): Jurnal Rekayasa Kimia & Lingkungan (December, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i2.13790

Abstract

Hospital wastewater basically contains organic materials and inorganic materials. Levels of these materials can be determined by testing of Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Dissolved Solid (TDS), and Total Suspended Solid (TSS). The hospital wastewater treatment proposed in this research is the electrocoagulation treatment using electrodes Fe-Fe and uses the response surface method for optimizing the response variable. Referring to this resea rch, the result shows that the relationship between the process variables and the TSS is significantly influential. As the contact time (15, 30, and 45 minutes) is longer and the voltage (6, 9, and 12 volts) is higher, the percentage reductions of TSS increase. However, the electrolyte solution (01 M) has little influence/significance to a response variable of TSS. The highest percentage of TSS reduction is at the contact time 30 minutes and 12 volts, which declined at contact time 45 minutes. The model recommended is a quadratic form with a low error less than 1.6%. In such a way, the optimum condition is at contact time 36 minutes, voltage 12 volts, and the electrolyte (NaCl) concentration 0.1 M. The reduction percentage is TSS 72.45%.
pemanfaatan selulosa dari limbah kulit buah pinang sebagai bahan baku pembuatan bioplastik Tamiogy, Wahyu Ramadhani; Kardisa, Anis; Hisbullah, Hisbullah; Aprilia, Sri
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i1.11517

Abstract

Bioplastik adalah salah satu jenis plastik yang terbuat dari sumber biomassa terbarukan. Selulosa dari kulit buah pinang berpotensi sebagai bahan baku pembuatan bioplastik dengan menggunakan gliserol sebagai plastizicer. Tujuan penelitian ini untuk membuat film plastik biodegradable, dimana prosedur penelitian adalah isolasi alfa-selulosa dengan metode delignifikasi, pembuatan bioplastik dengan metode solution casting dan karakterisasi bioplastik. Selulosa yang telah diekstraksi dari kulit buah pinang digunakan untuk pembuatan film plastik. Ekstraksi selulosa menggunakan variasi konsentrasi NaOH saat delignifikasi sebesar 15%, 20%, dan 25% dan bleaching dengan NaOCl 3,5%. Sedangkan pembuatan film plastik menggunakan variasi perbandingan gliserol 0,5 gram, 1 gram, dan 1,5 gram. Dimana karakteristik bioplastik terbaik pada penelitian ini diperoleh pada konsentrasi pelarut NaOH 20% dengan penambahan gliserol 1,5 gram di dapat densitas sebesar 0,3 gr/ml, daya serap terhadap air 128,57%, kuat tarik sebesar 14,57 kgf/mm2, dan % elongasi sebesar 5,44%
Recycle Limbah Plastik Jenis PET (Polyethylene Terepthalate) dengan Proses Pirolisis dengan katalis Silika-Alumina Salamah, Siti; Maryudi, Maryudi
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i1.11954

Abstract

Limbah/ Sampah plastik di dunia semakin meningkat setiap tahunnya, bahkan hingga menyentuh angka yang sangat mengkhawatirkan. Sampah yang paling banyak ditemukan adalah jenis PET. Selain itu ketahanan energi saat ini perlu diperhatikan juga, sehingga teknologi dalam mengkonversi sampah menjadi energi dengan proses pirolisis penting dilakukan. Penelitian ini dilakukan dengan menggunakan bahan baku sampah PET berupa botol bekas yang berasal dari sekitar dengan katalis berupa katalis SiO2/Al2O3 berbentuk butiran. Penelitian dilakukan dengan reaktor fixed bed berbahan stainlees steel yang dilengkapi dengan condensor. Penelitian dilakukan dengan pengecilan ukuran plastik PET (1-2 cm) dan proses pirolisis dilakukan pada suhu 450 oC pada waktu 2 jam dengan variabel berat katalis tetap yaitu 4,8,12 dan 16 gram. Produk pirolisis dianalisis dengan FTIR (F tranfor Infra Red) dan Gas Kromatografi MS-Pac. Dari penelitian ini dihasilkan produk pirolisis berujud gas dan cairan yang dalam yang temperatur ruangan berujud padatan berwarna kuning, dengan titik lebur 90 0 C. Pirolisis optimal terdapat pada suhu 450 OC dengan katalis 1 % berat umpan 400 gr diperoleh yield 14 %. Hasil analaisi FTIR (Fourier Transform Infrared Spectroscopy) menunjukkan dalam produk mengandung gugus benzene, gugus karbonil, gugus ester, gugus hidroksil. Kandungan senyawa yang paling dominan pada hasil analisis GC-MS adalah asam benzoate 71 %, yang merupakan monomer dari PET dan senyawa turunan asam benzoate ( toluene dan isomernya ) 15 %,Biphenil 4 % dan triphenil 7 %
Pelapisan Silika pada Stainless Steel secara Elektroforesis Disertai Anodisasi untuk Perlindungan Korosi Suari, Ni Made Intan Putri; Ratnasari, Delyana; Tulaini, Sahara; Widiyastuti, Widiyastuti; Setyawan, Heru
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i1.13159

Abstract

Penelitian ini mempelajari pengaruh anodisasi terhadap karakteristik perlindungan korosi lapisan silika pada permukaan stainless steel. Anodisasi dilakukan menggunakan larutan asam oksalat dengan memvariasikan waktu anodisasi dan beda tegangan. Elektroforesis dilakukan menggunakan campuran sol silika, isopropanol dan asam asetat dengan perbandingan mol 0,0028 : 0,5048 : 0,1938 selama 10 menit dengan amplitudo 0,5 V, frekuensi 80 Hz dan duty cycle 60%. Dilakukan uji Particle Size Analyzer (PSA) terhadap sol silika. Diperoleh distribusi ukuran partikel sebesar 3,19 nm dan zeta potensial -31,68 mV. Dilakukan analisa polarisasi linear dan Electrochemical Impedance Spectroscopy (EIS) dengan larutan NaCl 3,5% serta Scanning Electron Microscopy (SEM) terhadap lapisan yang terbentuk pada permukaan stainless steel. Dari hasil analisa diperoleh logam yang telah dianodisasi dan elektroforesis memiliki kemampuan perlindungan korosi lebih baik dibanding logam tanpa perlakuan. Waktu dan beda tegangan saat anodisasi berpengaruh terhadap karakteristik perlindungan korosi lapisan pada logam. Diperoleh waktu anodisasi optimum selama 20 menit dan voltase 10 volt dengan laju korosi sebesar 0,000659 mm/tahun. Untuk uji EIS, nilai admitan dan nilai tahanan pori masing-masing sebesar 1.824,7 ohm dan 0,0010226 Mho. Hasil SEM menunjukkan bahwa setelah dilakukan anodisasi terbentuk lapisan yang berpori yang nantinya menjadi tempat menempelnya silika pada proses elektroforesis.
Fabrikasi Membran PES Ultrafiltrasi Dan Kinerjanya Pada Penyisihan Fosfolipid Minyak CPO Razi, Fachrul; Fathanah, Umi; Erfiza, Novia Mehra
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i1.13091

Abstract

Penyisihan kandungan fosfolipid dalam minyak mentah kelapa sawit (CPO) telah dilakukan menggunakan membran ultrafiltrasi polietersulfon (PES). Membran PES dibuat secara inversi fasa dengan variasi konsentrasi polimer PES yaitu 15% dan 18% (%-b) dan pelarut dimetil sulfoksida (DMSO). Membran yang dihasilkan disebut membran PES-15 dan PES-18. Selanjutnya Membran PES dilakukan uji karakterisasi yaitu observasi struktur morfologi membrane menggunakan scanning electron microscopy (SEM) dan analisa komposisi kimia menggunakan FT-IR. Unjuk kerja membran PES pada penyisihan fosfolipid dalam minyak CPO dilakukan secara ultrafiltrasi menggunakan modul dead-end. Rasio komposisi CPO dan heksana dalam larutan umpan yaitu 40%:60% dan 60%:40% (b/b). Hasil SEM membran memperlihatkan bahwa membran PES-15 dan PES-18 memiliki struktur asimetrik dengan lapisan atas berupa lapisan tipis dan rapat (dense) sedangkan lapisan penyangga (support) berupa lapisan berongga (porous dengan struktur pori berbentuk jari. Hasil analisis komposisi kimia baik pada membran PES-15 dan PES-18 menunjukkan adanya gugus C=O dan 0=S=O pada kedua jenis membran yang mengindekasikan struktur molekul PES. Kinerja penyisihan fosfolipid tertinggi diberikan oleh membran PES-15 untuk umpan larutan CPO dengan komposisi 60% CPO:40% heksana (b/b) dimana persen penyisihan fosfolipid mencapai 97%Kata kunci: penyisihan fosfolipid, minyak cpo, ultrafiltrasi, membran PES, stuktur assimetrik
Adsorpsi Logam Berat Menggunakan Selulosa Xanthat dari Bagas Tebu Iryani, Dewi Agustina; Risthy, Nisa Meutia; Br. Ginting, Simparmin; Darmansyah, Darmansyah
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i1.12520

Abstract

The most effective way to reduce the pollution of heavy metal waste is the adsorption process using an adsorbent. Sugarcane bagasse is one of materials that has high affinity to absorb heavy metals. The adsorption capacity of sugarcane bagasse can be increased by converting it into cellulose xanthate by reaction of cellulose with carbon disulfide (CS2). Synthesis of cellulose xanthate consists of three stages, i.e isolation, alkalization, and xanthation. In this study, the preparation of cellulose xhantate was conducted by adding carbon disulfide (CS2) about 180% (w/w). The temperature of xhantation reaction was varied at 35C, 40C and 45C. The effect of temperature reaction into degree of substitution (DS), the degree of polymerization (DP) and the metal adsorption capacity of cellulose xanthate for Zn2+ and Pb2+ were determined by quantitative and qualitative analyze. Morphological characteristics of cellulose xanthate was characterized by SEM and the functional groups contained in the cellulose xanthate was characterized by FTIR. The result showed that cellulose xanthate synthesized at temperature of 35C have a highest value of DS, DP, and the adsorption capacity higher than two variations of temperature (40C and 45C). The value of DS, DP, and the adsorption capacity is 0.389, 299.27, 48.353 mg/g for Zn2+ metal and 51.763 mg/g for the metals Pb2+, respectively
Penyerapan Zat Warna Basic Red 18 dan Direct Black 38 dengan Menggunakan Sabut Pinang sebagai Adsorben Muhammad, Muhammad -; Muhammad Syam, Azhari -; Ibrahim, Ishak -; Nurfarida, Nurfarida -; Darmadi, Darmadi -
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i1.13526

Abstract

AbstrakAdsorpsi zat warna basic red 18 dan direct black 38 dengan adsorben dari serat pinang telah diteliti. Morfologi dan gugus fungsi permukaan serat pinang dianalisa dengan Fourier transform infrared spectroscopy (FT-IR) dan scanning electron microscopy (SEM). Penelitian ini fokus pada mekanisme adsorpsi dan pengaruh dosis adsorben. Koefisien korelasi (R2) dianalisis dengan menggunakan regresi linier. Mekanisme adsorpsi dilakukan dengan menggunakan dua model isoterm, yaitu isoterm Langmuir dan Freundlich. Hasil kajian menunjukkan bahwa model Freundlich adalah yang paling sesuai diaplikasikan untuk adsorpsi zat warna basic red 18 dan direct black 38. Karena model Freundlich mampu menginterpretasikan proses adsorpsi zat warna basic red 18 dan direct black 38 dengan baik, maka sistem adsorpsi yang digunakan dalam penelitian ini adalah heterogen. Kapasitas adsorpsi untuk basic red 18 pada berbagai berat adsorben (seperti: 1, 2, dan 3 g) menggunakan model Freundlich adalah 0,234 L/g; 0,101 L/g dan 0,093 L/g. Sementara kapasitas untuk direct black 38 adalah 0,360 L/g; 0,374 L/g dan 0,141 L/g.

Page 10 of 32 | Total Record : 319

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