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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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Biosensor Urea Berbasis Biopolimer Khitin Sebagai Matriks Immobilisasi Nazaruddin, Nazruddin
Jurnal Rekayasa Kimia & Lingkungan Vol 6, No 1 (2007): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Penelitian tentang biosensor urea menggunakan biopolimer khitin sebagai matriks immobilisasi telah dilakukan. Penelitian ini dilakukan untuk mengetahui kinerja biosensor yang dihasilkan yang meliputi sensitivitas, trayek pengukuran, limit deteksi, waktu respon, koefisien selektifitas, dan waktu hidup. Penelitian meliputi beberapa tahap yaitu pembuatan membran polimer khitin dan immobilisasi enzim urease, pelekatan membran khitin pada elektroda pH, dan pengukuran parameter kinerja elektroda. Hasil pengukuran menunjukkan sensitivitas biosensor urea berbasis membran khitin adalah 19,11 mV/dekade, trayek pengukuran 10-4 10-8 M, limit deteksi 10-8 M, waktu respon 3,106,02 menit, dengan urutan kekuatan ion penggangu berturut-turut adalah NH4Cl, NaCl, CH3COONa, campuran garam, KCl, CaCl2, dan asam askorbat.Kata kunci: biosensor, immobilisasi, khitin, urea
Spore Production of Biocontrol Agent Trichoderma Harzianum: Effect of C/N ratio and Glucose Concentration Said, Syahiddin Dahlan
Jurnal Rekayasa Kimia & Lingkungan Vol 6, No 1 (2007): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Effects of medium condition on spore production and spore viability of Trichoderma harzianum UPM 29 isolated from oil palm rhizosphere were studied. The carbon to nitrogen (CN) ratio and glucose concentration have significant effect on spore production and spore viability of the fungus. Highest spore production (1.6x108spores/ml) was obtained in a medium containing 30 g/l glucose with a CN ratio of 24. The highest spore viability (52.5%) was produced in the culture grown on media with glucose concentration of 30 g/l and with a C/N ratio of 44.Keywords: biocontrol agent, biofungicide, spore viability, Trichoderma harzianum
Adsorpsi Fenol pada Membran Komposit Khitosan Berikatan Silang Rahmi, Rahmi
Jurnal Rekayasa Kimia & Lingkungan Vol 6, No 1 (2007): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Telah dilakukan penelitian pembuatan membran komposit khitosan-PVP (polivinil pirolidon) berikatan silang dengan variasi komposisi. Khitosan yang digunakan adalah hasil deasetilasi khitin dari kulit udang. Pembuatan membran komposit khitosan berikatan silang dilakukan dengan variasi komposisi PVP:khitosan dan variasi konsentrasi asam sulfat yang digunakan sebagai pembentuk ikatan silang. Hasil penelitian menunjukkan komposisi PVP:khitosan optimum adalah 0,1:2 (b/b) dengan persen penyerapan sebesar 88,62% dan konsentrasi optimum H2SO4 adalah 0,5 N. Waktu kontak dan pH optimum diperoleh pada 15 menit dan pH 4. Kinetika adsorpsi dipelajari berdasarkan persen adsorpsi pada pH yang berbeda dan mekanisme adsorpsi yang terjadi. Hasil penelitian menunjukkan bahwa konsentrasi H+ dan gugus amino yang ada pada khitosan mempengaruhi laju adsorpsi, dimana semakin besar konsentrasi H+ dan gugus amino semakin besar laju adsorpsi, sehingga kinetika adsorpsi fenol merupakan orde 2. Isoterm adsorpsi fenol pada membran komposit khitosan berikatan silang mengikuti isoterm adsorpsi Langmuir dengan nilai kapasitas adsorpsi maksimum sebesar 0,071 mg/g.Kata kunci: khitosan, membran, polivinil pirolidon
Oksidasi Parsial Metana Menjadi Metanol dan Formaldehida Menggunakan Katalis CuMoO3/SiO2 : Pengaruh Rasio Cu:Mo, Temperatur Reaksi dan Waktu Tinggal Husin, Husni; Mairiza, Lia; Zuhra, Zuhra
Jurnal Rekayasa Kimia & Lingkungan Vol 6, No 1 (2007): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Oksidasi parsial metana menjadi metanol dan formaldehida menggunakan katalis tembaga molybdenum oksida berpenyangga silica (CuMoO3/SiO2) telah dilakukan. Preparasi katalis dilakukan dengan metode impregnasi. Hasil identifikasi dengan XRD menunjukkan bahwa komponen katalis terdiri dari senyawa MoO3, CuO, dan SiO2. Uji kinerja katalis dilangsungkan dalam reactor pipa lurus berunggun tetap, beroperasi pada temperature 400, 425, 450, 475, dan 500oC, dengan waktu tinggal (W/F) 5,82, 9,7, dan 14,55 gram katalis jam/mol. Produk reaksi dianalisis menggunakan gas kromatografi dengan kolom molsieve 5A dan porapak-Q. konversi metana tertinggi sebesar 36,83% diperoleh saat menggunakan katalis dengan rasio Cu:Mo=1:1,5 pada W/F 14,55 grcatjam/mol dan temperatur reaksi 500oC. Selektivitas metanol tertinggi diperoleh 11,19 % menggunakan katalis dengan rasio Cu : Mo 1 : 3,5 pada W/F 5,82 grcat.jam/mol dan temperatur reaksi 400oC. Selektivitas formaldehida tertinggi diperoleh 20,75% menggunakan katalis dengan rasio Cu : Mo 1 : 2,5 pada W/F 9,7 grcatjam/mol dan temperatur reaksi 400oC.Keywords: formaldehida, katalis CuMoO3/SiO2, metanol, oksidasi metana
Mencegah Pembentukan Kalsium Sulfat pada Desalinasi Air Laut Lubis, Mirna Rahmah; Zhu, Li; Granda, Cesar B.
Jurnal Rekayasa Kimia & Lingkungan Vol 6, No 1 (2007): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Resin penukar-anion, Relite MG 1/P, dapat digunakan untuk memisahkan sulfat dalam air laut guna mencegah pembentukan kerak kalsium sulfat pada heat exchanger. Resin tersebut menunjukkan selektivitas sulfat yang tinggi dalam air laut sintetis. Resin yang telah dipakai dapat diregenerasi menggunakan air asin yang dipekatkan dengan asam hingga mencapai pH 4. Untuk waktu pemakaian dan regenerasi yang sama, faktor konsentrasi desalinasi (misalnya 2 hingga 4) menaikkan konsentrasi klorida dalam air asin yang diblowdown. Dengan faktor konsentrasi yang tetap, kenaikan laju alir (pengurangan waktu pemakaian dan regenerasi) memperendah efisiensi regenerasi dan menaikkan pemisahan sulfat. Akibat kelarutan kalsium sulfat yang bersifat terbalik tersebut, temperatur air asin yang tinggi memerlukan pemisahan sulfat yang lebih banyak, yang dapat dicapai dengan mengurangi laju alir air laut. Pengurangan laju alir tersebut membutuhkan peralatan yang lebih besar dan resin yang lebih banyak, sehingga biaya modal bertambah. Untuk pabrik desalinasi dengan kapasitas produksi 1 juta gallon per hari dan faktor konsentrasi sebesar 2, biaya pemisahan sulfat meliputi biaya resin dan biaya peralatan. Biaya tersebut bervariasi dari $0.246 hingga $0.356/kgalon (per ribu galon air yang diproduksi) karena temperatur maksimum air asin berubah dari 140C menjadi 180C.Keywords: desalinasi air laut, ion exchange, kalsium sulfat, kerak; mechanical vapor compression (MVC), pemisahan sulfat, resin penukar-anion basa lemah
Studi Pengurangan Bilangan Asam, Bilangan Peroksida dan Absorbansi dalam Proses Pemurnian Minyak Goreng Bekas dengan Zeolit Alam Aktif Widayat, Widayat
Jurnal Rekayasa Kimia & Lingkungan Vol 6, No 1 (2007): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Penelitian awal peningkatan kualitas minyak goreng dengan adsorbsi dengan zeolit telah dilakukan. Hasil penelitian menunjukkan bahwa ukuran zeolit dan perbandingan massa zeolit merupakan variabel yang berpengaruh. Penelitian ini bertujuan untuk memperoleh model matematika dan kondisi optimum pada proses pemurnian minyak goreng dengan zeolit. Parameter yang diamati adalah bilangan asam, bilangan peroksida dan absorbansi. Proses optimasi menggunakan metode respon permukaan/central composite. Pengolahan data menggunakan perangkat lunak Statica 6. Hasil penelitian diperoleh kondisi optimum untuk bilangan asam optimum sebesar 1,7 bilangan peroksida sebesar 12,84, kadar air sebesar 1,91 % dan absorbansi sebesar 0,12 dicapai pada masa zeolit 19,07 gram dan diameter zeolit 1,69 mm. Model matematika untuk penurunan bilangan asam, bilangan peroksida, dan absorbansi secara beurutan adalah:Y1 = 1,2394 + 0,0181X1 + 0,356X2 + 0,0001X12 - 0,0134X1X2 - 0,0299X22Y2 = 35,3305 - 1,222X1 - 13,1576X2 + 0,0186X12 + 0,3749X1X2 + 1,4698X22Y3 = 0,2736 + 0,0057X1 - 0,2191X2 - 0,0002X12 + 0,0006X1X2 + 0,0568X22Kata kunci: absorbansi, adsorbsi, bilangan asam, bilangan peroksida, zeolit
Pengaruh Konsentrasi Substrat Kulit Nanas dan Kecepatan Pengadukan terhadap Pertumbuhan Lactobacillus plantarum untuk Produksi Asam Laktat Febriningrum, Panca Nugrahini
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 3 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v9i3.784

Abstract

One of the alternative utilization of pineapple peel waste is to convert them to lactate acid via fermentation. This research is aimed to obtain better understanding on the growth of lactate bacteria (Lactobacillus plantarum) by varying substrate concentration: 100 g/L - 600 g/L and stirring rate of 50 rpm, 150 rpm, and 250 rpm. The growth of anaeroic process was performed without pH controlling with initial pH of 5 and temperature of 28OC. Pineapple peel was used as the substrate after romoving water content using ammonium dihydrogen phosphate. Cell growth was analyzed by calculating the total of microorganism cell using hemocytometer. In order to determine lactate acid production, glucose concentration was analyzed using spectrophotometer. Nelson-Somogy method was employed in this analysis. Ethanol concentration was also analyzed by calculating the titration of acid lactate concentration. The optimum growth of Lactobacillus plantarum was found at 28oC, stirring rate of 150 rpm and substrate concentration of 500 g/L contributing to the total cell of 3,85.108, 1,13.109, and 4,00.108 for lag, exponential, and decrease phase respectively. Further analysis carried out based on stirring rate of 150 rpm and substrate concentration of 500 g/L resulted in the largest average concentration of lactate acid of 1.620% v/v with glucose consumption percentage of 51,76%.Keywords: pineapple peel, Lactobacillus plantarum, lactate acid
Pembuatan Papan Partikel (Particle Board) dari Tandan Kosong Sawit dengan Perekat Kulit Akasia dan Gambir Fathanah, Umi; Sofyana, Sofyana
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 3 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v9i3.783

Abstract

The need of wood as one of raw materials in furniture industry keeps increasing. One of efforts to reduce wood consumption is to develop research by creating composite design from material that contains sellulose to be particle board. Particle board is one of material alternatives that can be wood substitute. The objective of this research is to investigate the effect of natural-adhesive-mixture composition (acacia bark and gambier) with oil-palm-empty bunch toward mechanical property of particle board. Characterization of particle board was carried out by undertaking mechanical property testing (tensile strength and compressive strength) under wet and dry conditions. Composition variations of adhesive and oil-palm-empty bunch were 30:70; 40:60; 50:50; 60:40; 70:30. Making process of particle board is carried out by mixing oil-palm-empty bunch and adhesive with addition of 2% para-formaldehyde and water as much of 10%. Furthermore, the mixture is compressed by using Hot Press at temperature of 150oC and pressure of 10 kg/cm2 for 15 minutes. The research result indicates that the higher the adhesive composition (either adhesives of acacia bark or gambier), particle board resulted is better. In dry condition, values of the tensile strength of particle boards that have acacia bark adhesive and gambier adhesive have range of 84.2 - 104 Kgf/cm2 and 83.4 - 81.5 kg/cm2, respectively. Whereas, values of compressive strength of particle boards that have adhesives of acacia bark and gambier are in the range of 6.8 - 10.5 kg/cm2 and 6.3 - 9.3 kg/cm2, respectively. The values of tensile strength and compressive strength are obtained on compositions of adhesive: oil-palm-empty bunch 40:60, and they have fulfilled satandard of SNI 03-2105-1996. The values of tensile strength and compressive strength of particle board in wet condition, either adhesives of acacia bark or gambier, have not fulfilled standard of SNI 03-2105-1996.Keywords: empty-bunch-oil palm, acacia bark, gambier, particle board, tensile strength
Pengolahan Limbah Cair Laundry Menggunakan Membran Selulosa Diasetat Berbasis Selulosa Pulp Kayu Sengon (Paraserianthes falcataria) Setiawan, Vera Roni; Rosnelly, Cut Meurah; Darmadi, Darmadi
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 3 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v9i3.782

Abstract

The improvement of laundry activity brought a negative effect on the environment because laundry wastewater have a high content pollutants such as phosphate, surfactants, mineral, nitrogen, COD and other components, so the treatment is needed before being discharged into terristorial water. Laundry wastewater treatment has been conducted by membrane technology. Preparation of cellulose diacetate membranes with ultrafiltration process had be done by phase inversion using dimethylformamide (DMF) as a solvent. The filtration experiment showed that the highest membrane flux was 77,408 L/m2.h at TMP 3 bar. While the lowest flux at TMP 1 bar was 55.649 L/m2.h. Rejection of membrane ultrafiltration for parameters of COD, phosphate, and surfactant were 67%, 72%, and 63% respectively.Keywords: cellulose diacetate membranes, laundry wastewater, flux, rejection
Aktivitas Antioksidan Ekstrak Etanol Daun Ubi Jalar Ungu (Ipomea batatas L.) Hasil Budidaya Daerah Saree Aceh Besar Sulastri, Sulastri; Erlidawati, Erlidawati; Syahrial, Syahrial; Nazar, Muhammad; Andayani, Thursina
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 3 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v9i3.781

Abstract

This research was aimed to investigate the antioxidant activity of purple sweet potato leaves cultivated in Saree, Aceh Besar. The study was conducted in two stages. The first stage included sampel preparation, phytochemical test, max determination, testing of antioxidant activity by reducing power method, and TLC analysis. In stage 2 purification using column chromatography, phytochemical test, and antioxidant activity test were performed. The sample was dissolved by using 70% ethanol and 1.5 N HCl with a ratio of 85:15 (v/v). Phytochemical test results showed that the sample consisted of not only flavonoids but also tannins. The Rf value for both sample and standard are respectively 0.55 and 0.61 with absorbance value of 0.826 and 0.845. The sample was then purified using column chromatography and 25 fractions were grouped based on the color intensity abbreviated as FA, FB and FC. Photochemical test was then conducted to examine the purity of obtained fraction and FB was found to be relatively purer than other fractions. Reducing power test of FB with variation of weight 10 mg, 20 mg, 30 mg, 40 mg, and 50 mg gave the percentage inhibition 64.1, 6.7, 67.9, 70.3 and 73.6, respectively, while the percentage value of - tocopherol at simmilar weight variation are 32.1, 36.7, 43.5 and 50.2%. From the result obtained, it can be concluded that the antioxidant activity of ethanol extract of thick purple sweet potato leaves is higher than -tocopherol.Keywords: antioxidant activity, purple sweet potato leaves, reducing power

Page 22 of 32 | Total Record : 319

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