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All Journal Jurnal Rekayasa Proses Jurnal Sains dan Seni ITS World Chemical Engineering Journal JURNAL INTEGRASI PROSES Konversi Jurnal Chemurgy Jurnal Rekayasa Proses Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Jurnal Tekno Insentif Jurnal Abdi Masyarakat (JAM) Jurnal Teknik Industri Terintegrasi (JUTIN) Equilibrium Journal of Chemical Engineering Jurnal Riset Teknologi Pencegahan Pencemaran Industri REACTOR : Journal of Research On Chemistry And Engineering Warta Perkaretan Jurnal Teknologi Kimia Unimal Jurnal Ilmiah Berkala Sains dan Terapan Kimia CHEMTAG Journal of Chemical Engineering Journal of Industrial Community Empowerment SAINTI: Majalah Ilmiah Teknologi Industri Jurnal Teknologi Kimia Mineral Journal of Energy, Materials, & Manufacturing Technology Majalah Teknik Industri Jurna Beta Kimia Communication in Food Science and Technology Maximus: Journal of Biological and Life Sciences Journal Of Chemical Process Engineering Jurnal Polimesin Jurnal Rekayasa Proses PATRIOTIK: Jurnal Inovasi dan Pemberdayaan Masyarakat
Dennis Farina Nury
Politeknik Industri Petrokimia Banten
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Produksi Karboksimetil Selulosa dari Nata De Coco dan Limbah Kertas Napitupulu, Lukas Fernando; Panjaitan, Jabosar Ronggur Hamonangan; Simanjuntak, Tiurmaida Gebryela; Herlambang, Aldillah; Yuniarti, Reni; Nury, Dennis Farina
Jurnal Tekno Insentif Vol 18 No 1 (2024): Jurnal Tekno Insentif
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah IV

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36787/jti.v18i1.1388

Abstract

Abstrak Limbah kertas dan nata de coco merupakan material yang mengandung selulosa. Selulosa yang terdapat pada limbah kertas dan nata de coco dapat dimanfaatkan untuk memproduksi produk dengan nilai jual tinggi yaitu karboksimetil selulosa (CMC). Pada penelitian ini diteliti produksi CMC dari limbah kertas dan nata de coco serta membandingkan nilai derajat subsitusi (DS) yang dihasilkan nya. Berdasarkan penelitian yang telah dilakukan diperoleh bahwa CMC dari nata de coco memiliki derajat subsitusi tertinggi yaitu 0,661 dengan konsentrasi NaOH dan natrium monokloroasetat (NaMCA) yang digunakan sebesar 20% dan 16 gram. Sedangkan CMC dari bahan baku limbah kertas memiliki derajat subsitusi terendah yaitu 0,066 dengan konsentrasi NaOH dan NaMCA yang digunakan sebesar 10% dan 10 gram. Konsentrasi NaOH dan NaMCA mempengaruhi nilai DS CMC, dimana semakin tinggi konsentrasi NaOH dan NaMCA yang digunakan akan menghasilkan nilai DS CMC yang tinggi. Pada penelitian ini diperoleh nilai DS CMC nata de coco lebih tinggi dibandingkan dengan DS CMC limbah kertas. Nilai DS pada CMC dapat diperoleh maksimal dengan adanya proses pretreatment bahan baku dan optimasi jumlah NaOH dan NaMCA pada proses produksi CMC. Abstract Paper waste and nata de coco contain cellulose. The cellulose which found in paper waste and nata de coco can be used to produce products with high selling value, namely carboxymethyl cellulose (CMC). In this research, CMC production from paper waste and nata de coco was examined and the value of degree of substitution (DS) produced was compared. Based on research that has been carried out, it was found that CMC from nata de coco had the highest DS, namely 0.661 with NaOH and sodium monochloroacetate (NaMCA) concentration used were 20% and 16 grams. Meanwhile, CMC from paper waste raw had the lowest DS, namely 0.066 with NaOH and NaMCA concentration used were 10% and 10 grams. The concentration of NaOH and NaMCA affects the DS CMC value, where higher NaOH and NaMCA concentration used will produce higher DS CMC value. In this study, the DS CMC of nata de coco was higher than the DS CMC of paper waste. The maximum DS value in CMC can be obtained by raw materials pretreatment and optimizing the amount of NaOH and NaMCA in the CMC production process.
Removal of Ammonium and Phosphate from Synthetic Wastewater of Complex Fertilizer Industry Through Struvite Crystallization Process Zulfikar Luthfi, Muhammad; Setiadi, Tjandra; Nury, Dennis Farina; Choerudin, Choerudin
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 14 No. 2 (2023): November
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2023.v14.no2.p23-32

Abstract

The complex fertilizer industry produces wastewater which contributes to the pollution of water bodies because it contains high levels of phosphate and ammonium concentrations and high TKN (Total Kjeldahl Nitrogen) which contains organic nitrogen. The organic nitrogen contained in the complex fertilizer wastewater is urea so it can be hydrolyzed to ammonium using the urease enzyme. The ammonium formed from the hydrolysis of urea will then react with magnesium and phosphate to form struvite, a crystal of Magnesium Ammonium Phosphate (MAP). The purpose of this study was to determine the effect of aeration and the enzyme urease in the removal of ammonium and phosphate in complex fertilizer synthetic wastewater through struvite precipitation. Struvite precipitation was carried out in a batch reactor which had a working volume of 0.5 L with variations in aeration rate, aeration time, and the addition of urease enzyme from Jack bean peas (Canavalia ensiformis). Residual ammonium and phosphate levels were analyzed and struvite crystal formation (MAP) was determined using Scanning Electron Microscope (SEM) and X-ray diffraction (XRD). The results showed that the aeration reactor was able to form struvite crystals and remove the ammonium and phosphate content in the synthetic wastewater of complex fertilizers. The removal of ammonium with a molar ratio of [Mg2+] : [NH4+] : [PO43-] 1:2:1 reached 61-77% at high aeration rates because a lot of ammonium was released into the air. The phosphate removal reached 99%. The urease enzyme was proven to be able to hydrolyze urea into ammonium and increase the pH value and affect the shape of the resulting struvite crystals. The precipitate product obtained was struvite crystals which were confirmed by analysis using SEM-EDX and XRD.
Optimization of plunger geometry and stroke settings on hydraulic performance of diaphragm metering pumps Sonjaya, Muhammad Luthfi; Setyawan, Hendra; Ritonga, Jhordan; Sarifudin, Alfan; Nury, Dennis Farina
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7308

Abstract

This study examines the influence of plunger diameter and stroke length on the performance of a hydraulic diaphragm metering pump, focusing on two key indicators: discharge pressure and flow rate. Experiments were conducted with five plunger diameters (7.90–9.00 mm) and three-stroke settings (100%, 75%, and 50%), validated in accordance with API 675 standards. Results show that each 1 mm increase in plunger diameter produced a consistent rise in flow rate across all stroke settings. Linear regression analysis revealed strong correlations, with flow rate increments of 67.54 mL/min per mm at 100% stroke, 60.78 mL/min per mm at 75% stroke, and 25.34 mL/min per mm at 50% stroke. High coefficients of determination (R²) confirm the robustness and predictive accuracy of these models. In addition to regression analysis, a two-way ANOVA was performed to statistically evaluate the effects of plunger diameter and stroke length, as well as their interaction, on pump performance. The ANOVA results confirmed that both parameters significantly affected flow rate (p 0.05), while discharge pressure was largely unaffected by stroke variation. The optimal configuration was achieved at a plunger diameter of 8.00 mm and 100% stroke, delivering performance that meets API 675 requirements. Importantly, this study proposes a novel validation framework for hydraulic diaphragm metering pumps based on API 675—a gap not fully addressed in prior research. These findings provide practical guidance for improving the efficiency and reliability of pump systems through optimized geometric and operational parameters.
Pemisahan Butanol dari Campuran ABE Menggunakan Software Aspen Plus: Pengaruh Refluks Rasio terhadap Kandungan Butanol Nury, Dennis Farina; Febriyanto, Pramahadi; Ismi, Lisa Anggraini; Hidayah , Rahmat Taufik
REACTOR: Journal of Research on Chemistry and Engineering Vol. 3 No. 1 (2022)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v3i1.43

Abstract

Production of acetone-butanol-ethanol (ABE) through the fermentation process is one alternative that needs to be developed. Less economical in the ABE fermentation process is the difficulty of the separation process from the fermentation product and the by-products of the reaction. Among the separation process methods, such as extraction, distillation, adsorption, and gas stripping, the distillation method is still the most widely used method in the ABE separation process. The purpose of this study was to provide recommendations for predicting good ABE separation and producing optimum operating conditions to produce high % butanol content. Which is then simulated using Aspen Plus V11 software. This study varied the reflux ratio in the distillation column and the decanter operating temperature. The results showed that butanol purity reached 90.33% in the radfrac 1 column operated at a pressure of 1.3 atm with a reflux ratio of 5, the location of the 7th feed stage and the number of stages 11. Then proceed to the purification stage in the radfrac column 2 which is operated at a pressure of 2 atm with a reflux ratio of 5, the location of the 4th stage feed and the number of stages 5. The decrease in the reflux ratio of the radfrac column causes a decrease in the butanol content at the bottom so that the purity of butanol also decreases and decreases % recovery or recovery of butanol. This is also followed by the location of the feed stage, which is getting higher, and the number of stages is increasing.
Evaluasi High Temperature Shift (HTS) Converter pada Pemurnian Pabrik Amonia Berdasarkan Konversi CO Nury, Dennis Farina; Janah, Dikri Uzlifah; Fitriyani, Vira; Luthfi, Muhammad Zulfikar
Journal of Energy, Materials, & Manufacturing Technology Vol 3 No 02 (2024): Journal of Energy, Materials, & Manufacturing Technology
Publisher : Unit Penelitian, dan Pengabdian Masyarakat (UPPM) Politeknik ATI Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61844/jemmtec.v3i02.773

Abstract

Pada proses pembuatan amonia salah satunya ialah shift converter yang berfungsi untuk mengonversi kandungan CO menjadi CO2. Di dalam shift converter terdiri dari HTS (High Temperature Shift Converter) dan LTS (Low Temperature Shift Converter). Kinerja HTS harus dievaluasi secara terus menerus agar tidak menyebabkan kerusakan pada unit purifikasi atau yang lainnya dan menghasilkan produk yang optimal, maka perlu dilakukan kajian mengenai alat tersebut dengan cara menghitung nilai kinerja alat High Temperature Shift dengan cara  membandingkan nilai data desain dengan nilai data aktual. Penelitian ini dilakukan selama 6 minggu dari bulan Juli sampai Agustus 2023 dan merupakan jenis penelitian deskriptif kuantitatif. Data kuantitatif dikumpulkan melalui pengamatan secara langsung pada alat High Temperature Shift (HTS) Converter (104-D1) di Unit Amonia Pabrik PT. Pupuk Sriwidjaja II-B. Dari hasil perhitungan didapatkan seluruh konversi CO secara aktual pada bulan Juli sampai Agustus 2023 melebihi data desain yaitu >70%, sedangkan konversi CO secara desain 69,208%. Secara aktual, konsentrasi CO yang keluar sudah lebih kecil daripada desain. Sehingga dapat disimpulkan bahwa kinerja HTS dalam mengubah CO menjadi CO2 dalam kondisi baik.
Pengaruh Kondisi Temperatur Pirolisis Tandan Kosong Kelapa Sawit Terhadap Komposisi Produk Tar Nury, Dennis Farina; Luthfi, Muhammad Zulfikar; Zullaikah, Siti
REACTOR: Journal of Research on Chemistry and Engineering Vol. 3 No. 1 (2022)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v3i1.47

Abstract

Oil palm empty fruit bunch (EFB) is one of the biomass wastes that have a great potential of a bioenergy resource due to its natural properties, such as high calorific value. The conversion of EFB biomass into valuable biofuels can achieved through biochemical and thermochemical processes. Tar (bio oil), the liquid product from the pyrolysis is one of the most attractive biofuels. The study aims to determine the effect of temperature process of pyrolysis EFB on its tar production under droptube reactor. The results showed that maximum tar yield was 43,80% obtained at 500 °C. The EFB tar produced at 500 °C was also determined to have a higher of phenol compound at 51,9%. The high phenolic content indicates its potential to be used for the production of renewable phenolic resins. Hence, the present work of pyrolysis of EFB presents itself as a promising method to produce phenol rich tar (bio-oil) from biomass waste.
PEMBUATAN CRUMB RUBBER DARI LIMBAH KARET BAN-DALAM MENGGUNAKAN KEROSIN DAN MESIN GILING Saputra, Andri; Windiastuti, Septiyana; Agustian, Mertza Fitra; Saputra, Danang Cahya Eka; Oktavianto, Putra; Nury, Dennis Farina; Herlambang, Aldillah
Warta Perkaretan Vol. 44 No. 2 (2025): Volume 44, Nomor 2, Tahun 2025
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.wp.v44i2.1121

Abstract

Jumlah produksi ban di Indonesia mengalami peningkatan setiap tahunnya yang memberikan pengaruh terhadap peningkatan jumlah limbah ban-dalam. Pemanfaatan limbah ban-dalam sangat sulit dilakukan karena tidak dapat terurai secara alami bahkan setelah jangka waktu yang lama. Penelitian ini bertujuan mengembangkan metode kombinasi kimia dan mekanik dalam produksi crumb rubber dari limbah ban-dalam, guna menghasilkan alternatif daur ulang yang efisien dan dapat diterapkan pada skala industri kecil. Limbah ban-dalam dipotong menjadi spesimen uji, kemudian direndam dalam kerosin pada berbagai variasi waktu dan dikeringkan hingga berat konstan. Sifat mekanis (kekuatan tarik dan perpanjangan putus) diuji menggunakan Universal Testing Machine (UTM). Hasil penelitian diketahui bahwa semakin lama perendaman menggunakan kerosin maka semakin menurunkan sifat mekanis spesimen karet uji. Perendaman dalam larutan kerosin selama 96 jam menurunkan kekuatan tarik (93,7%) dan perpanjangan putus (91%) spesimen karet uji secara maksimal. Crumb rubber yang diperoleh dari penelitian ini berukuran berkisar 0,3-0,5 cm. Analisis spektra FTIR mengonfirmasi bahwa produk crumb rubber yang dihasilkan bebas dari kerosin.
UJI EFEKTIVITAS ADSORBEN DARI KULIT DURIAN TERHADAP KADAR COD DAN TSS PADA LIMBAH CAIR INDUSTRI TAHU Nury, Dennis Farina; Damayanti, Alfira Putri; Deviany, Deviany; Luthfi, Muhammad Zulfikar
Jurnal Chemurgy Vol 9, No 2 (2025): Jurnal Chemurgy-Desember 2025
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/cmg.v9i2.21739

Abstract

AbstrakPenelitian ini bertujuan untuk mengevaluasi efektivitas adsorben arang aktif dari kulit durian dalam menurunkan kadar BOD dan COD pada limbah cair industri pengolahan rumput laut. Proses adsorpsi dilakukan dengan variasi massa adsorben dan waktu kontak untuk menentukan kondisi optimum. Hasil terbaik diperoleh pada perlakuan massa adsorben 100 gram dengan waktu kontak 2 jam, yang menghasilkan penurunan BOD sebesar 74,4 mg/L (6,06%) dan COD sebesar 224,1 mg/L (21,64%). Penurunan kadar BOD dan COD menunjukkan bahwa peningkatan massa adsorben dan waktu kontak memberikan pengaruh positif terhadap kemampuan adsorpsi. Namun demikian, efektivitas adsorpsi dapat dipengaruhi oleh faktor kejenuhan adsorben, fouling pada permukaan, serta proses desorpsi yang terjadi pada waktu kontak lebih lama. Karakteristik proses adsorpsi dianalisis menggunakan model isoterm Langmuir dan Freundlich. Hasil analisis menunjukkan bahwa data adsorpsi lebih sesuai dengan model isoterm Langmuir, yang mengindikasikan terjadinya adsorpsi monolayer pada permukaan homogen. Dengan demikian, optimasi massa dan waktu kontak diperlukan agar adsorpsi berlangsung efektif dalam menurunkan beban pencemar organik. Kata Kunci: adsorpsi, arang aktif, kulit durian, BOD, COD, isoterm LangmuirAbstract This study aims to evaluate the effectiveness of activated carbon adsorbent derived from durian peel in reducing BOD and COD levels in wastewater from the seaweed processing industry. The adsorption process was conducted by varying the adsorbent mass and contact time to determine the optimum conditions. The best result was achieved with 100 grams of adsorbent and 2 hours of contact time, resulting in a BOD reduction to 74.4 mg/L (6.06%) and COD to 224.1 mg/L (21.64%). The decrease in BOD and COD levels indicates that increasing adsorbent mass and contact time positively influences adsorption efficiency. However, the adsorption performance may be limited by adsorbent saturation, surface fouling, and desorption at prolonged contact times. The adsorption characteristics were analyzed using Langmuir and Freundlich isotherm models. The results revealed that the Langmuir isotherm better described the adsorption process, indicating monolayer adsorption on a homogeneous surface. Therefore, optimizing the adsorbent mass and contact time is crucial to achieving efficient organic pollutant removal. Keywords: adsorption, activated carbon, durian peel, BOD, COD, Langmuir isotherm
IDENTIFIKASI BAHAYA DAN EVALUASI RISIKO STEAM DRUM DENGAN HAZOP DI INDUSTRI PETROKIMIA Tutuka, Rachmadi; Aziz, Arizal Abdul; Zulkipli, Rohiman Ahmad; Nury, Dennis Farina
SAINTI: Majalah Ilmiah Teknologi Industri Vol. 22 No. 1 (2025)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/sainti.v22i1.60

Abstract

Steam drum merupakan salah satu komponen utama dalam sistem boiler pada unit Steam Cracker Unit yang berperan penting dalam proses pemisahan uap dan air. Penelitian ini bertujuan untuk mengidentifikasi bahaya serta mengevaluasi risiko pada steam drum menggunakan metode Hazard and Operability Study (HAZOP). Parameter yang dianalisis meliputi tekanan, level air, suhu, dan aliran steam. Setiap penyimpangan (deviation) dianalisis berdasarkan penyebab (cause), dampak (consequence), serta rekomendasi mitigasi (recommendation) untuk meningkatkan keselamatan proses. Hasil analisis menunjukkan beberapa risiko dengan kategori High Risk seperti overpressure, low water level, dan high temperature dengan nilai risk ranking sebesar 16. Rekomendasi mitigasi meliputi perawatan berkala, kalibrasi sensor, penambahan sistem alarm, serta penguatan prosedur operasional. Penerapan metode HAZOP dinilai efektif dalam membantu identifikasi bahaya dan penentuan strategi mitigasi pada steam drum boiler, sehingga dapat meningkatkan keselamatan dan keandalan proses di industri petrokimia.
Pengembangan Bioplastik Berbasis Pati dengan Penambahan Propilen Glikol sebagai Plasticizer Agustina, Amelia Naomi; Nury, Dennis Farina; Nainggolan, Denny Hendrik
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 9 No. 2 (2026): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v9i2.56795

Abstract

The petrochemical industry plays an important role in the supply chain of polymer-based products. In terms of raw materials, this industry still relies heavily on fossil-based feedstocks whose availability is gradually declining. On the other hand, the products generated from this industry contribute to the increasing accumulation of plastic waste due to their resistance to natural degradation. Nevertheless, the demand for industrial sustainability continues to rise along with the increasing needs of society. The development of bioplastics can serve as one of the diversification strategies to produce value-added materials, specifically in biodegradability. This study aims to produce bioplastics using various type of starch and fillers with propylene glycol as a plasticizer and to analyze their characteristics. The results of this study indicate that the appropriate combination of starch, filler, and plasticizer can enhance the physical characteristics of bioplastics. The bioplastics produced using various combinations of starch types and fillers in this study were able to degrade, which is better than standard commercial bioplastics that had not degraded within seven days. However, further optimization of the formulation is still required to achieve physical characteristics that approach or meet the Indonesian National Standard (SNI). 
Co-Authors AA Sudharmawan, AA Adelia, Putri Jesika Agnesia Putri Rini Agustian, Mertza Fitra Agustina, Amelia Naomi Ahmad Rifqiyan Farohi Akhmad Zainal Abidin Akhmad Zainal Abidin, Akhmad Zainal Aldillah Herlambang Andhini Putri Trianita Andri Saputra Ardian, Adna Ivan Arum, Amalia Sekar Arvianto, Rizky Ibnufaatih Auriyani, Wika Atro Aziz, Arizal Abdul Betariani, Khairunisa Choerudin, Choerudin Chrystover, Endrigo Damayanti Damayanti Damayanti, Alfira Putri Deviany Deviany Deviany, Deviany Enny Nurmalasari Fahlovi, Oldy Fahni, Yunita Febriyanto, Pramahadi Feerzet Achmad Ferry Ikhsandy Fitriyani, Vira Fredy Kurniawan Handik Hendratama Handoko, Yohanes Tri Hendra Setyawan Hidayah , Rahmat Taufik Hutabarat, Fransisco Xala Hutabarat, Monalisa Ismi, Lisa Anggraini Jabosar Ronggur Hamonangan Panjaitan Janah, Dikri Uzlifah Jerry, Jerry Kurniawati, Intan Wahyuning Lestari, Maghfira Arum Lisa Anggraini Ismi Manurung, Martin Sugiarto Maulana, Akmal Mayastuti, Sherina Melani Putri Miftahul Khairati Miftahurrahmah Miftahurrahmah, Miftahurrahmah Monita Pasaribu Muhammad Fajri Muhammad Luthfi Muhammad Nasyarudin Iqbal, Muhammad Nasyarudin Muhammad Zulfikar Luthfi Mustafa , Mustafa Mustafa Mustafa Nainggolan, Denny Hendrik Napitupulu, Lukas Fernando Naufal, Hafidz Naulina, Rosada Yulianti Ningrum, Khofifah Anggitiya Nugroho , Muhammad Erwin Cahyo Nugroho, Muhammad Erwin Cahyo Oktavianto, Putra Okti Ulandari Prahmana, Rico Aditia Pramahadi Febriyanto Puji Rahayu Puji Rahayu Puteri, Denanda Clarasati Putra, Muhamad Iqbal Putra, Muhammad Iqbal Rahmat Taufik Hidayah Regna Tri Jayanti Reni Yuniarti Ritonga, Jhordan Safitri, Nurul Ulfa Saputra, Danang Cahya Eka Saragih, Juro Dufan Sarifudin, Alfan Satria , Arysca Wisnu Satria, Arysca Wisnu Setiadi, Tjandra Simanjuntak, Tiurmaida Gebryela Siti Zullaikah Suharto Suharto Suharto Suharto Suhartono Suhartono Suhartono SUHIRMAN SUHIRMAN Sutri, Reni Tampubolon, Yosi Anugrah S.M Tri Widjaja Trisnantari, Tamaratritania Citta Tutuka, Rachmadi Variyana, Yeni Windiastuti, Septiyana Wiratama, Ihsan Yunita Fahni Zulkipli, Rohiman Ahmad Zullaikah, Siti