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All Journal CHEMICA Jurnal Teknik Kimia Eksergi: Chemical Engineering Journal Seminar Nasional Teknik Kimia Kejuangan Proceedings Konferensi Nasional Sistem dan Informatika (KNS&I)
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Jurusan Teknik Kimia, Fakultas Teknologi Industri Universitas Pembangunan Nasional “Veteran” Yogyakarta Jln. SWK 104 Lingkar Utara Condongcatur, Yogyakarta, 5584
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Uji Ketahanan (Robustness Test) Algoritma Steganografi Pada Aplikasi Media Sosial Berbasis Android Jaya, Danang
Proceedings Konferensi Nasional Sistem dan Informatika (KNS&I) 2015
Publisher : Proceedings Konferensi Nasional Sistem dan Informatika (KNS&I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (379.646 KB)

Abstract

Algoritma dasar steganografi yang umum digunakan antara lain adalah LSB dan DCT. Masingmasing algoritma dasar steganografi ini mempunyai tingkat ketahanan yang berbeda-beda pada suatu perubahan atau serangan.Beberapaaplikasi media sosialdalam aplikasi smartphone antara lain adalah whatsapp, Blackberry, Facebook dan Telegram. Masing-masing aplikasi memiliki cara tersendiri dalam melakukan layanan pengiriman pesan berbentuk citra. Beberapa layanan media sosial terbukti merusak isi pesan dalam steganografi. Percobaan dengan menggunakan aplikasi steganography yang dikirimkan melalui media sosial menunjukkan bahwa pesan tidak dapat dibuka untuk beberapa media sosial dan utuh pada BBM dengan permintaan HD dan pengiriman file pada Telegram.
The Effect of Adding Activated Sludge and Types of Series Circuit Systems Microbial Fuel Cell (MFC) Using Chinese Food Restaurant Wastewater Danang Jaya; Tunjung Wahyu Widayati; Singgih Adi Nugroho; Firda Ellysa
Eksergi Vol 19, No 1 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i1.6479

Abstract

Electricity consumption expands every year. However, in Indonesia, electricity is still highly dependent on conventional energy sources such as coal. A microbial fuel cell (MFC) is one of the alternative inventions that consists of a series of tools which converts chemical energy into electrical energy in the presence of microbial metabolism. In addition to produce electrical energy, it may also help to solve environmental issues by dealing with waste. This research was purposed to investigate the potency of Chinese food restaurant waste as substrate to generate electricity in microbial fuel cell. The research was done in three stages: wastewater preparation, assembly of MFC tools in various circuits, and running MFC processes. Results showed that the best electrical average (1.02 V) was found in the treatment system without active sludge. The best circuit was in the system in 4 series, which obtained a maximum voltage of 3.76 V and the largest power density of 62.66  mW/m2. In addition, with the addition of active sludge, biological oxygen demand (BOD) of the wastewater could be lowered up to 29.27%, and chemical oxygen demand (COD) up to 51.58%. Total suspended solid (TSS) could be decreased up to 49% on the sample withoud sludge addition.
Influence of dietyl ether on the mixture of biodiesel B50 Danang Jaya; Rico Mitchell Litaay; Ryan Ade Bagus; T.W. Widayati; Muhammad Syahri
Eksergi Vol 19, No 1 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i1.6387

Abstract

Biodiesel is generally defined as monoalkyl esters of plant oils and animal fats. Oils derived from plants and animal fats and their derivatives have the possibility as a substitute for diesel fuel. This biodiesel is then mixed with diesel with a composition of 50% biodiesel and 50% diesel to make B50. In this study, B50 was then mixed with diethyl ether. The results of this study, obtained a mixture of B50+0% diethyl ether, B50+2% diethyl ether, B50+4% diethyl ether, B50+6% diethyl ether, B50+8% diethyl ether, B50+10% diethyl ether with kinematic viscosity (6.5 mm2/s, 6 mm2/s, 5.4 mm2/s, 5 mm2/s, 4.3 mm2/s, and 3.6 mm2/s), flash point (183 oC, 179 oC, 177 oC, 175 oC, 171 oC, and 167 oC), pour point (7 oC, 6 oC, 5 oC, 4 oC, 2 oC, and 1 oC), caloric value (10051,66 cal/m3, 10097,1322 cal/gram, 10128,13 cal/gram, 10170,38 cal/gram, 10235,37 cal/gram, and 10306,84 cal/gram), and density 15 oC (841.1 Kg/m3, 839.5 Kg/m3, 838.2 Kg/m3, 837 Kg/m3, 836.2 Kg/m3, dan 835.1 Kg/m3)
Dewatering Batubara Jorong, Kalimantan Selatan Dengan Menggunakan Minyak Goreng Bekas Dan Minyak Tanah Danang Jaya
Eksergi Vol 14, No 2 (2017): Eksergi Volume 14 No 2 2017
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v14i2.2140

Abstract

Potensi sumber daya batubara di Indonesia sangat melimpah. Namun, cadangan batubara tersebut pada umumnya termasuk batubara peringkat rendah dengan kadar air yang tinggi. Untuk mengatasi kadar air, salah satu teknologi yang telah dikembangkan saat ini ialah slurry dewatering yaitu pemanasan dengan menambahkan zat aditif berupa minyak residu. Proses slurry dewatering dilakukan dengan mencampurkan batubara ukuran 35 mesh seberat 100 gr ke dalam minyak goreng bekas, dan minyak tanah pada perbandingan berat sebesar 1 : 1 : 1 , 1 : 1 : 0,5 ,dan 1 : 0,5 : 0,5. Campuran dipanaskan pada suhu 120oC, 130oC, 140oC, 150oC, dan 160oC. Selanjutnya dilakukan pengadukan dengan kecepatan putaran 500 rpm dengan waktu 1,5 jam. Hasil slurry setelah proses dimasukan ke dalam centrifuge untuk memisahkan cairan dengan padatannya. Kemudian setelah didapatkan hasil optimal dilakukan percobaan kembali pada suhu 170oC dan 180oC. Hasil penelitian paling optimum didapatkan pada perbandingan 1 : 1 : 1 dan suhu operasi 160oC. Hasil analisa awal kadar air batubara sebesar 13,09 % dan nilai kalor sebesar 5554,36 kal/g lalu diperoleh hasil analisis akhir penelitian kadar air batubara sebesar 0,61 % dengan nilai kalor 7391,09 kal/gr. Data menunjukan penurunan kadar air batubara Jorong, Kalimantan Selatan mecapai 95,34% dan kenaikan nilai kalori sebesar 24,85%.
Pembuatan Edible Film dari Tepung Jagung Danang Jaya
Eksergi Vol 10, No 2 (2010): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v10i2.333

Abstract

 Edible film adalah suatu lapisan tipis yang dibentuk untuk melapisi makanan (coating), berfungsi sebagai penghalang terhadap perpindahan massa dan atau sebagai pembawa aditif. Penggunaan tepung jagung sebagai edible film merupakan solusi yang menarik sebagai pembungkus pangan inovatif yang dapat menyatu pada bahan makanan. Tepung jagung dipilih karena dapat diuraikan oleh mikroorganisme dan dapat dimakan, sehingga dapat dikatakan lebih ramah lingkungan. Pembuatan edible film dari tepung jagung ini bertujuan untuk menentukan kuat tarik dan kelarutan dalam air edible film yang relatif baik terhadap komposisi bahan. Penelitian dilakukan dengan cara melarutkan tepung jagung sebanyak 10 gram dengan aquadest 50 ml, ditambahkan 70 ml aquadest mendidih dan dipanaskan sampai suhu ± 85ºC. Suspensi yang terbentuk didinginkan mengunakan pengaduk stirrer kemudian ditambahkan gliserol dan sorbitol. Edible film yang terbentuk kemudian dicetak dan dikeringkan menggunakan oven pada suhu 100ºC selama ± 4 jam. Perbandingan volume gliserol dengan sorbitol bervariasi dari: 0:1, 0:2,sampai 5:5. Karakterisasi edible film meliputi analisis kuat tarik (sifat mekanik) dan daya larut dalam air (sifat fisis). Komposisi relatif baik untuk sifat edible film yang dihasilkan adalah dengan perbandingan volume gliserol 1 ml dan volume sorbitol 1 ml dengan kuat tarik sebesar 17,2765 N dan daya larut sebesar 0,0091 g/ml.
Pemanfaatan CPO (Crude Palm Oil) Untuk Desulfurisasi Pada Batubara Menggunakan Metode Flotasi Danang Jaya; Ebeng Soegondo
Eksergi Vol 13, No 2 (2016)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v13i2.1699

Abstract

Sejalan dengan perkembangan pemanfaatan batubara di Indonesia, muncul pula beberapa kendala yang menghambat  perkembangan tersebut yaitu adanya gas SO2  hasil pembakaran batubara yang dapat menimbulkan pencemaran  udara. Flotasi adalah suatu proses untuk memisahkan padatan halus yang terpisah dari suatu padatan dengan padatan yang lain. Penelitian desulfurisasi pada batubara  yang berasal dari bahan baku PLTU menggunakan metode flotasi dilakukan secara kontinyu dalam sebuah alat kolom flotasi. Disini beberapa variabel flotasi diantaranya adalah perbandingan antara batubara dengan CPO yaitu 1:2, 1:4, 1:6 dengan laju alir umpan yang berbeda-beda. Diperoleh kondisi yang optimal pada pengurangan kadar sulfur pada proses flotasi ketika laju alir umpan sebesar 0,3612 L/menit dengan perbandingan CPO/Batubara pada 1:2 dengan sulfur yang terambil sebesar 45,269 %.
Bioethanol Production From Green Algae Spirogyra sp Danang Jaya; Rahayu Setiyaningtyas; Sudiyono Prasetyo
Eksergi Vol 15, No 1 (2018): Vol 15, No 1 (2018)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v15i1.2290

Abstract

Bioethanol is an alternative fuel that has potential to replace the oil fuel. The bioethanol feedstock can be derived from the green algae Spirogyra sp that is rarely exploited. High carbohydrates content in the Spirogyra sp algae is highly potential to be developed into ethanol through chemical and biological processes. This research is done through several stages: preparation of raw material, hydrolysis using sulfuric acid 0,2 M, and fermentation using Saccharomyses cerevisiae in an anaerob condition. The objective of this study is to find out the optimum reaction time and optimum quantity of Saccharomyses cerevisiae in the fermentation process. Variations of reaction time and yeast quantity are applied; those are 3, 4, 5 and 6 days for reaction time, and 0,5%; 0,75%; 1%; 1,25%; 1,5%; and 1,75% for yeast quantity. The stoichiometric calculation is used to analyse the result of this experiment. The result shows that the optimum duration for the fermentation is 5 days and the optimum quantity of yeast is 1% by weight. The condition of fermentation process must be held in pH of 4,5 and temperature of 30oC. The produced alcohol in those condition is 0,0613 mol.
Enhancing coal tailing quality by Flotation Method using Biosurfactant from Lerak (Sapindusrarak De Candole) Danang Jaya; Tunjung Wahyu Widayati; Refina Yuni Mustika; Halim Nur Aziz Suwardi
Eksergi Vol 17, No 1 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i1.3298

Abstract

Wasted from coal mining that mixed with the wasted of the coal washing product called Coals Tailing (CT) has a low calorific value,high sulfur and ash content. To upgrade its quality by increasing its calorific value and to reduce environmental pollution by reducing sulfur and its ashes, coal must improve from its impurities, one of which is to try with flotation method. Flotation is a process that describes solids that occur due to differences in surface properties (surface properties). The flotation process takes place in a system consisting of three phases, namely gas phase, liquid, and solid, which are interrelated to complete the appearance (with the help of flotation agent  /  surfactant)  so  that  discussion  occurs  between  the  hydrophobic  component  (waterproof)  and  the hydrophilic component (like water). The main objective of the research is to improve the quality of coals tailing (CT), by increasing the calorific value (reducing the content of sulfur, ash, and other impurities) using the flotation method, and using lerak (Sapindus rarak De Candole) as a surfactant. From this research show that an optimal conditions were obtained, at particle size of -80 / + 100 mesh, operating conditions at pH 6, calorific value increased from initially 3230,171 cal/gr to 5035,622 cal/gr, sulfur content decreased according to   the optimum condition reached 2026.08 mg /kg, and the ash content decreased from 54.61% to 33.9%. From the results of these research indicate, Lerak as a surfactant is is enhanced to improve the quality of Tailings Coal (CT) by flotation method.
Production of biodiesel from waste cooking oil using heterogeneous catalyst Danang Jaya; Tunjung Wahyu Widayati; Hanum Salsabiela; Muhammad Fathan Abdul Majid
Eksergi Vol 19, No 1 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v0i0.6132

Abstract

The world's oil reserves are running low, which makes the government also implement a mandatory B30 policy starting in early 2020. With this policy, it is necessary to develop energy by utilizing renewable energy such as vegetable oil that can be converted into biodiesel. Waste cooking oil is one of the vegetable oils that has the potential to be processed into biodiesel because the use of waste cooking oil in Indonesia is still not developed. In this study, we report the yield of biodiesel from waste cooking oil with variations in the ratio of the number of moles and weight of heterogeneous catalysts. Biodiesel is made by esterification and transesterification with a heterogeneous catalyst (CaO), then a separation process is carried out to separate the biodiesel produced from the by-product in the form of glycerol. The separated biodiesel is then analyzed for density, viscosity, flash point, and pour point. The results showed that the best biodiesel was at a mole ratio of 1:24 with 3% CaO catalyst. Based on the analysis data, this biodiesel has the largest yield of 72.49% with a viscosity value of 4.9806 cSt, a flash point value of 72.5 oC, a pour point value of 0 oC, and a density value of 0.8662 g/ml and calorific value. 8837,302 cal/gram. With the results of the analysis, that are in accordance with the quality standards of SNI 7182:2015.
Pemanfaatan Bittern sebagai Elektrolit Alternatif pada Sel Aki Bekas Peggy Bunga Safitri; Aprilia Ramona; Abdullah Effendi; Danang Jaya
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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

Abstract

This research was aimed for study the effect of the bittern use as an alternative electrolyte also the reaction time and also the usage duration of accumulator towards the value of resulting electrical conductivity. Bittern contains magnesium sulphate (MgSO4) which when viewed from its molecular structure is able to replace the function of sulfuric acid (H2SO4) electrolyte. Data collection was performed by analyzing sample of bittern and the factors that affect the occurrence of electrochemical processes such as pH, ion concentration of ion Mg+ and ion SO4-, and electrical conductivity that generated with a pH meter, multimeter, spectrometry UV/Vis method, and Spectrometry Atomic Absorption (SAA/SSA flame). The results showed the concentration of Mg+ ion and SO4-ion on Bittern is 2.02 M and 0.3 M with the value of electric potential (Esel) amounted to 1,1189 V. The largest value of electrical conductivity is 1.67 V-3.983 A on the first accumulator with the longest reaction time for 12 days and the best usage duration of accumulator with electrolyte Bittern without recharging is ± 2 times usage.
Co-Authors Abdullah Effendi Anantyto Danujatmiko Anantyto Danujatmiko Anisa Anisa Aprilia Ramona Bagus Drajat Trimulyo Dian Prasetyani Basuki Ebeng Soegondo Endang Sulistyawati Fahmi Reza Octavianto Firda Ellysa Halim Nur Aziz Suwardi Hanum Salsabiela Hector Nack Izzulhaq, Muhammad Agung Mirawati, Fevi Muhammad Fathan Abdul Majid Muhammad Syahri Peggy Bunga Safitri Puji Raharjo Ragita Putri Rahayu Setiyaningtyas Refina Yuni Mustika Rico Mitchell Litaay Ryan Ade Bagus Singgih Adi Nugroho Sudiyono Prasetyo T.W. Widayati Tunjung Wahyu Widayati Tunjung Wahyu Widayati Tunjung Wahyu Widayati Widayati, Tunjung Wahyu