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syafrizal
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OPTIMIZATION Syafrizal
Scientific Contributions Oil and Gas Vol. 43 No. 3 (2020): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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The
OPTIMIZATION Syafrizal
Scientific Contributions Oil and Gas Vol. 39 No. 1 (2016): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.39.1.253

Abstract

The purpose
IN SILICO POTENTIAL ANALYSIS OF X6D MODEL OF PEPTIDE SURFACTANT FOR ENHANCED OIL RECOVERY Cut Nanda Sari; Usman; Rukman Hertadi; Tegar Nurwahyu Wijaya; Leni Herlina; Ken Sawitri Suliandari; Syafrizal; Onie Kristiawan
Scientific Contributions Oil and Gas Vol. 39 No. 2 (2016): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.39.2.267

Abstract

Peptides and their derivatives can be applied in enhanced oil recovery (EOR) due to their ability to form an emulsion with hydrophobic molecules. However, peptide research for EOR application, either theoretical or computational studies, is still limited. The purpose of this research is to analyse the potency of the X6D model of surfactant peptide for EOR by molecular dynamics simulations in oil-water interface. Molecular dynamics simulation using GROMACS Software with Martini force field can assess a peptides ability for self-assembly and emulsification on a microscopic scale. Molecular dynamics simulations combined with coarse grained models will give information about the dynamics of peptide molecules in oil-water interface and the calculation of interfacial tension value. Four designs of X6D model: F6D, L6D, V6D, and I6D are simulated on the oil-water interface. The value of interfacial tension from simulation show the trend of F6D L6D > I6D > V6D. The results indicate that V6D has the greatest reduction in interfacial tension and has the stability until 90C with the salinity of at least 1M NaCl.
CONSTRUCTION AND EXPRESSION?OF QUARTET RECOMBINANT PEPTIDE SURFACTANT FOR EOR APPLICATION Cut Nanda Sari; Usman; Refiana Lestary; Riesa Khairunnisa W.R.; Leni Herlina; Syafrizal; Tati Kristianti; Sony Suhandono
Scientific Contributions Oil and Gas Vol. 39 No. 3 (2016): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.39.3.271

Abstract

The main drawback of the SUPEL peptide surfactant product which has been developed for EOR application is it isunstable at a high temperature. This research is aimed at generating the prototype of peptide surfactant construction in recombinant by stringing up 4 SUPEL linier sequences. Quartet recombinant technology can produce the peptide surfactant characterized as reversible biosurfactant, which is active at high temperature but inactive at low temperature. Multiple SUPEL Construction (MSC) that was developed in this research is using synthetic DNA and producing SUPEL in 4 sequences that can flip at normal temperature and can open when heated. SDS PAGE analysis results show that MSC construction can be expressed by inducting IPTG and cell harvested at 90C. This research proves that construction and expression of the SUPEL quartet has been achieved by producing the peptide at an ideal size.
EFFECTS OF PETROFILIC MICROORGANISMS AND BULKING AGENT ON HYDROCARBONS BIODEGRADATION EFFICIENCY Zulkifliani; Pujawati Suryatmana; Annisa Rosalina Sylvia; Syafrizal
Scientific Contributions Oil and Gas Vol. 39 No. 3 (2016): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.39.3.273

Abstract

Bioremediation is a method which can be used to reduce the amount of pollutants or toxic substances that damage the environment through the use of microorganisms to remove the contaminants. The purpose of this research is to determine the effects of petrofilic microorganisms and bulking agent on the enhancement of hydrocarbons biodegradation efficiency, soil water content, growth rate of petrofilic bacteria and Azotobacter vinelandii. Nine treatments in this research were a petrofilic consortium (Pseudomonas spp., Actinomycetes sp., and petrofilic fungi) and Azotobacter vinelandii (biosurfactan), as well as bulking agent (rice husk charcoal and baglog waste of Oyster Mushrooms). The experiment design used was a randomized block design with three replications, so there were 27 experimental units (microscosmos). The result was that the application of petrofilic microorganisms and bulking agent is the best treatment to enhance the efficiency of hydrocarbons biodegradation, the growth rate of petrofilic bacteria, and soil water content. The petrofilic consortium treatment with the highest value of biodegradation efficiency reached 83,9%.
EFFECT OF DIETANOLAMIDE (DEA) SURFACTANT ADDITION AND DEEP-SEA BACTERIA ACTIVITIES ON THE BIODEGRADABILITY OF ARTIFICIAL OILY WASTEWATER IN SEAWATER MEDIA Syafrizal; Rendy Budi Prastiko; Tri Partono; Yanni Kussuryani
Scientific Contributions Oil and Gas Vol. 41 No. 2 (2018): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.41.2.303

Abstract

Marine oil spills have bad impacts on the marine biota. Oil spill mitigation that is currently safe, effi cient, relatively cheap and easy to implement is bioremediation, that is degradation of oil spills biologically using microorganisms. Petroleum will be more easily dispersed in water when surfactants are added. The surfactants have the ability to increase the bioavailability of petroleum to facilitate bacteria contact with carbon sources as their feed. This study was intended to test the effect of addition of diethanolamide (DEA) surfactants to improve the ability of bacteria to degrade hydrocarbon compound in the seawater media. The biodegradation experiment was conducted in 8-liter seawater media and the ability of DEA surfactants to reduce surface tension, oil content, pH and nutrients on days 0, 1, 3, 6 and 10 were observed. GC-MS analysis was conducted to detect chemical component changes in petroleum. A bacterial consortium of Enterobacter sp., Pseudomonas sp., and Raoultella sp. was utilized. The oil was degraded up to 65.52% with biodegradation rate k = -0.1054 t in the media added with DEA surfactants. The aliphatic fraction detected was C17-C31 n-alkane compound and after biodegradation it became C20- C31. The results showed that DEA surfactants were able to improve the ability of bacterial consortium to degrade petroleum.
KINETICS OF BATCH MICROBIAL DEGRADATION OF PHENOL BY PSEUDOMONAS AERUGINOSA AND DEEP-SEA SEDIMENT BACTERIA: SCALE-UP Syafrizal
Scientific Contributions Oil and Gas Vol. 41 No. 3 (2018): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.41.3.308

Abstract

Petroleum that is produced from several oil wells produces a fluid containing a mixture of petroleum, natural gas and produced water. The produced water usually contains hazardous chemicals such as hydrocarbons, sulfides, ammonia, phenols and other heavy metals. One of the high pollutants in the water produced is phenol. Through a biodegradation process, the contents of phenolic compounds in the produced water are expected to be reduced so that it meets the quality standards of waste water for oil and gas exploration and production activities. This research is development of the results of previous studies using a bioreactor with a larger scale, namely 3 L. The degradation process of phenolic compounds is carried out in optimal conditions, namely: pH 7, temperature 300C, and selected simple media: NP (5: 1) derived from urea and NPK + 0.1% yeast extract. The results of this study indicated that P. aeruginos and bacterial consortium may degrade phenolic compounds very well, which was 5.3 times faster than the previous studies. The biodegradation percentage was 98.40% in P. aeruginosa and 99.03% in bacterial consortium respectively. The monod kinetics model approach was successfully carried out and gave the value of parameters ?Max, Km, YS/X, and ?d respectively of 0.6305 hours-1, 0.0280 mg/L, 7 10-7 mg/L/ CFU/mL, and 0.00575 hours-1 in P. aeruginosa and 0.3272 hours-1, 0.0355 mg/L, 6.63 10-7 mg/L/CFU/ mL, and 0.00279 hours-1 in bacterial consortium. Based on the valuesof these parameters, P. aeruginosa has better affinity and growth.
BIODEGRADASI SENYAWA HIDROKARBON MINYAK BUMI MENGGUNAKAN AKTIFITAS BAKTERI LAUT DALAM Syafrizal; Restiya Rahmaniar; Tri Partono; Zulkifliani; Onie Kristiawan; Novie ArdhyArini; Yanny Handayani; Rofiqoh
Lembaran Publikasi Minyak dan Gas Bumi Vol. 54 No. 2 (2020): LPMGB
Publisher : BBPMGB LEMIGAS

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Pencemaran minyak bumi semakin banyak terjadi dengan semakin meningkatnya permintaan minyak untuk dunia industri, meningkatnya jumlah anjungan pengeboran minyak lepas pantai, dan meningkatnya transportasi laut.Beberapa cara penanggulangan tumpahan minyak meliputi penanggulangan mekanis, pembakaran in situ, kimiawi, dan bioremediasi. Bioremediasi adalah penggunaan makhluk hidup, khususnya mikroorganisme untuk mendegradasi atau mendetoksifikasi pencemar lingkungan. Mikroorganisme yang digunakan dapat berupa bakteri alami yang berasal dari daerah yang tercemar maupun bakteri yang diisolasi dari daerah lain lalu diintroduksi ke daerah yang tercemar.Penelitian ini bertujuan menguji kemampuan bakteri laut dalam mendegradasi minyak menggunakan media yang berbeda, yaitu antara media seawater nutrient broth dan media air terformasi, serta menyimulasikan proses degradasi minyak yang mengalami dispersi dalam sebuah microcosmPenelitian ini merupakan peningkatan skala dari penelitian Dwinovantyo (2015) dan modifikasi dari penelitian Cappello et al. (2006) dan Darmayati et al (2015). Simulasi degradasi tumpahan minyak dilakukan menggunakan media bervolume 8 liter berisi air laut yang tercemar tumpahan minyak, kemudian dilakukan pengamatan populasi bakteri serta kandungan tumpahan minyak. Bakteri yang digunakan adalah konsorsium dari Raoultella sp., Pseudomonas sp., dan Enterobacter sp. yang berasal dari sedimen laut dalam hasil isolasi dan identifikasi Dwinovantyo (2015).
PENGAMATAN MEOR MENGGUNAKAN FORMULA NUTRISI RENDAH GLUKOSA DENGAN METODA IMBIBISI Sugihardjo; Zulkifliani; Onie Kristiawan; Cut Nanda Sari; Syafrizal
Lembaran Publikasi Minyak dan Gas Bumi Vol. 53 No. 1 (2019): LPMGB
Publisher : BBPMGB LEMIGAS

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Kegiatan skala laboratorium telah dilakukan untuk merancang formula nutrisi MEOR (Microbial Enhanced Oil Recovery) dengan bahan dasar rendah-glukosa. Bahan yang dipakai meliputi: limbah cair tahu, air kelapa, limbah cair ikan, limbah pengolahan pati, ekstrak teh, pupuk cair, ekstrak daging sapi, dan pepton. Bahan-bahan tersebut diracik untuk menjadi beberapa formula yang dapat merangsang pertumbuhan mikroba yang terkandung pada percontoh fluida dari sumuran SMR-01, SMR-02, dan SMR-03 sehingga menghasilkan bioproduk yang diperlukan untuk MEOR Pada seleksi kajian awal ada 48 formula nutrisi, kemudian diseleksi dan diperoleh yang potensial dalam pertumbuhan mikroba sebanyak 8 formula, yaitu 2 macam formula untuk SMR-01, 3 untuk SMR-02, dan 3 juga untuk SMR-03. 8 formula tersebut diinkubasi selama 7 hari dan diamati bioproduknya yang meliputi: pertumbuhan mikroba, pH, IFT, densitas, dan viskositas minyak. Pada tiap formula juga ditambahkan konsorsium mikroba exogenous untuk memperkaya jenis mikroba. Uji imbibisi dilakukan terhadap 8 formula tersebut serta ditambah 8 formula lagi dengan menambahkan konsorsium mikroba exogenous selama 71 hari. Hasil yang terbaik ternyata ada pada formula Ef1 dengan penambahan ekstrak teh dan pepton dan Ez1 dengan tambahan ekstrak teh dan ekstrak beef pada fluida SMR-02. Dengan nilai masing masing nilai RF (recovery factor) 56,91 untuk Ef1 dan 55,86% untuk Ez1. Oleh karena itu kedua formula tersebut dapat dijadikan acuan untuk implementasi lapangan. Secara ekonomis mungkin Ez1 akan lebih murah karena prosentase kandungan extract beef hanya 10%.
PENGARUH CURRENT RATIO (CR) DAN DEBT TO EQUITY RATIO (DER) TERHADAP RETURN ON ASSETS (ROA) PADA PT ULTRAJAYA MILK Tbk PERIODE 2013-2022 Mohammad Sya’ban Abi Putra; Syafrizal
Journal of Research and Publication Innovation Vol 3 No 1 (2025): JANUARI
Publisher : Journal of Research and Publication Innovation

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This research aims to determine the influence of the Current Ratio and Debt to Equity Ratio on PT Ultrajaya Milk Tbk's Return On Asset, both partially and simultaneously. The independent variables used in this research are Current Ratio and Debt to Equity Ratio, while the dependent variable used in this research is Return On Asset. The research method used in this research is an associative quantitative method. The data collection technique used in this research is secondary data. The sample and population in this research are the financial reports of PT Ultrajaya Milk Tbk for the 2013-2022 period. The data analysis techniques used are descriptive analysis test, classical assumption test, correlation coefficient test, coefficient of determination test, multiple regression analysis test, t test and F test with the SPSS version 22 application. The results of the study show that partially the Current Ratio has no significant effect on Share Price where tcount is 1.631 < ttable 2.36462 with a significant value of 0.147 > 0.05. Partially, the Debt to Equity ratio has no significant effect on share prices, where t is 0.873 < t table 2.36462 with a significant value of 0.412 > 0.05. Simultaneously the Current Ratio and Debt to Equity Ratio do not have a significant effect on Return On Asset, where the Fcount value is 1.332 < Ftable 4.74 with a significant value of 0.324 > 0.05.
Co-Authors A. Muthalib Ade Irvan Tauvana Adi Wiluyo Aditya, Arrahman Agusmal Al Husna, Riezdqhy Amalina F. Albert Efendi Pohan Alpino Susanto Amri, Samsul Amrin, Naba Happyka Annisa Rosalina Sylvia Chairullah Chinta Pratama Saputra CUT NANDA SARI Desi Rahmawati DEWI RAHMAWATI Dianti, Devi Dijan Sunar Rukmi Dina Hayati Putri Edi Ardian, Edi Egi Dya Puji Lestari Eri Rahmawati Erwin Fadhillah Fajrul Wahdi Ginting, Fajrul Wahdi Fami Adetyas Maulana Pratama Fernando Fitri Fridarti Halimatuddini Halimatus Sakdiah Harissatria, Harissatria Hartanto, Ageng HARTATI Herandani, Cessy Ika Handayani Insam, Verosita Is Subekti, Mokhamad Jasmadi John Hendri Kadek Subagiada, Kadek Kamil, Insan Ken Sawitri Suliandari Kesha, Cut Nabilla Kinasih Prayuni, Kinasih Lenggogeni, Sari LENI HERLINA M. Abiyyu Yazid Nasution M. Prasetyo Wibowo Maizarah Medi Hendra, Medi Melda Yeni Mesi Anjani Mohammad Sya’ban Abi Putra Mokhamad Is Subekti Mubik Ihtajuddin Hammas Muhammad Faizal Abd. Ghani Muhammad Kaffabian Latief Muhammad Yusuf Zulkifli Mukhlis Mulia Rahman, Mulia Rahman Muslem Nanda Novita, Nanda Nasution, Ade Syahrani Nihayah, Silviatun Novie ArdhyArini Nur Asiah Nurhayati ONIE KRISTIAWAN Pariyani Prasetyo Pujawati Suryatmana Rachmanu, Fatkur Rafi Suryade Putra Rahmati, Ulvi Rahmilia, Desi Razari, Intan Refiana Lestary Rendy Budi Prastiko Reny Trisusanti Restiya Rahmaniar Reza Muttaqin Riesa Khairunnisa W.R. Rika Yuliwulandari, Rika Rima, Rosmania Rismawati Rizki, Julia Rofiqoh RUKMAN HERTADI Rustandi, Tria Adinda Sadji Evenddy, Sutrisno Salsabila, Putri Bahjah Samsuddin Siregar Sari, Ade Kartika Sari, Dessy Kurnia Sari, Rahmi Putri Setijo Bismo Siti Hajar Siti Hajar Sitompul, Siti Jahria SONY SUHANDONO Sri Mulyani Sugihardjo Supriadi Syafrida, M. Fajar Syukri Lukman TATI KRISTIANTI Tegar Nurwahyu Wijaya Tri Partono Tubagus Pamungkas Turmudi, Agung Usman Utami, Alya Nindityas W. Karmiadj, Djoko Wahyu Khafidah Wati, Rinda Yuliana Wibowo, Nanang Roni Widodo Wira Pratiwi Asril Yanni Kussuryani Yanny Handayani Yulia Hendri Yeni Yuza, Geby Fadilla Zaim, Ryanda Luthfi Zuhra, Nurliza Zulkifliani