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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Journal of Engineering and Technological Sciences CHEESA: Chemical Engineering Research Articles FLUIDA ASEAN Journal of Chemical Engineering International Journal of Applied Technology Research Jurnal Difusi Industrial Research Workshop and National Seminar Jurnal Teknik Kimia dan Lingkungan Journal Serambi Engineering (JSE)
Elizabeth, Lidya
Politeknik Negeri Bandung
Aerospace Engineering Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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PELATIHAN DAN PEMBUATAN MATERI UJI KOMPETENSI (MUK) SKEMA PENANGGUNG JAWAB PENGOPERASIAN PENGOLAHAN AIR LIMBAH (POPAL) Hidayatulloh, Irwan; Budiastuti, Herawati; Soeswanto, Bambang; Kusumawati, Endang; Trirahayu, Dhyna Analyes; Paramitha, Tifa; Ramadhani, Laily lsna; Elizabeth, Lidya
Jurnal Difusi Vol. 7 No. 2 (2024): Jurnal Difusi
Publisher : Pusat Penelitian dan Pengabdian Masyarakat (P3M) Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/difusi.v7i2.5561

Abstract

Ada 5 (lima) unit kompetensi dari draft skema okupasi Penanggung Jawab Pengoperasian Pengolahan Air Limbah (POPAL) yang sedang dibuat dan sekaligus akan diberikan dalam pelatihan bagi guru-guru SMK Negeri 7 Bandung oleh dosen-dosen Teknik Kimia, Politeknik Negeri Bandung. Unit kompetensi yang dimaksud yakni Mengoperasikan Instalasi Pengolahan Air Limbah (IPAL), Menilai Tingkat Pencemaran Air Limbah, Melakukan Perawatan IPAL, Mengidentifikasi Bahaya Pengolahan Air Limbah, dan Melakukan Tindakan Keselamatan Kerja terhadap Bahaya dalam IPAL. Dengan demikian para asesor di kedua institusi pendidikan ini dapat memiliki kompetensi dalam membuat MUK dimana MUK menjadi persyaratan wajib dalam pengusulkan draft skema yang akan diajukan untuk dilisensi oleh Badan Nasional Sertifikasi Profesi (BNSP) Indonesia. Hingga saat ini, terdapat beberapa kegiatan yang telah dilaksanakan. Pertama, koordinasi dan pertemuan telah dilakukan dengan pihak mitra untuk sinkronisasi pelaksanaan kegiatan. Kedua, koordinasi internal tim PkM untuk membahas pembagian tugas, rencana pembuatan MUK, dan rencana pelaksanaan pelatihan bagi para peserta pelatihan. Ketiga, merupakan pelaksanaan pelatihan mengenai pembuatan MUK unit kompetensi 1 dan 2. Keempat, merupakan lanjutan pelakasanaan kegiatan pelatihan mengenai pembuatan MUK untuk unit kompetensi 3, 4 dan 5.
Optimization of Drying Conditions of Chlorella vulgaris Using Tray Dryer for Biodiesel Feedstock Lidya Elizabeth; Rispiandi; Laily Isna Ramadhani; Dhyna Analyes Trirahayu; Hidayatulloh, Irwan
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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

Abstract

Microalgae are one of the primary feedstocks for biodiesel production due to their high lipid content, ranging from 4–77% of dry weight. Chlorella vulgaris is considered a superior species with a lipid content of 5–40% based on dry weight. Drying microalgae into powder form has been developed to improve handling, storage, and application, including in biodiesel production. However, drying remains a major challenge, as inappropriate methods may cause lipid degradation due to high-temperature exposure. This study aims to dry Chlorella vulgaris using a tray dryer and to optimize its operating conditions through analysis of variance based on Response Surface Methodology (RSM). Based on the literature, no previous studies have used a tray dryer for drying Chlorella vulgaris. Optimization was conducted by varying drying temperature (55–75°C) and air velocity (1.5–1.7 m/s) to achieve the highest drying efficiency. The highest efficiency was achieved at 79°C and 1.6 m/s, reaching 99.99% with energy consumption of 603.17 kWh/kg. Meanwhile, RSM analysis showed that the optimum condition was at 75°C and 1.7 m/s, resulting in 99.89% efficiency with energy consumption of 693.97 kWh/kg. Drying at both 75°C and 79°C proved to be efficient and safe in preserving lipid compounds in microalgae.
The Effect of Plasma Electrolysis for Biodiesel Synthesis Using Waste Cooking Oil as a Raw Material and KOH Catalyst Shoerya Shoelarta; Saripudin; Rahmat Dani Dwi Fedianto; Moch Adli Darojat; Sudrajat Harris Abdulloh; Irwan Hidayatulloh; lidya elizabeth
Fluida Vol. 16 No. 2 (2023): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16i2.3987

Abstract

The high consumption of cooking oil in Indonesia is directly proportional to the production of used cooking oil waste that can pollute the environment. To overcome this problem, used cooking oil is used as a biodiesel feedstock using the plasma electrolysis method. Plasma electrolysis is a synthesis process by applying a high voltage to the process. This study aims to determine the effect of the plasma electrolysis method with variations in voltage (400 - 500 volts) and the type of reagent (methanol and ethanol) on % yield and characteristics of biodiesel. The process is carried out by reacting used cooking oil with a reagent that is given a voltage until an electric discharge occurs and two layers are formed and the calculation of the specific energy requirements for the synthesis process is carried out. The results show that at a voltage of 500 volts with methanol reagent produces a yield of 85.73% with characteristics according to the SNI 7128:2015 standard such as density 888.36 Kg/m3, viscosity 5.79 Cst, acid number 0.39 mg - KOH/g, content ester 97.56% and flash point 117oC with the exception of water content 0.373%, with a specific energy requirement of 1758,031 J/mL.
The Effect of Maltodextrin Concentration and Spray Dryer Drying Temperature on the Characteristics of Coconut Milk Powder Fitria Yulistiani; Alifia Nuraeni; Sheilla Aulia Sofiatul Mardiah; Irwan Hidayatulloh; Lidya Elizabeth; Nurcahyo
Fluida Vol. 16 No. 1 (2023): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16i1.4006

Abstract

Coconut milk has a higher water content than other contents, so microbes can easily damage and spoil it. To obtain a low-moisture powder product, the liquid coconut milk was dried using a Buchi Mini Spray dryer B-290 with inlet temperatures of 150°C, 160°C, and 170°C. The researchers added maltodextrin to coconut milk, which had a ratio of grated coconut to the water of 1:3, in concentrations of 9%, 10%, 11%, 12%, and 13%. The addition of maltodextrin and the use of drying temperature did not significantly affect the pH, solubility, and percentage of product mass but did significantly affect the moisture content. The best operating conditions for producing coconut milk powder were at a maltodextrin concentration of 13% and a temperature of 170°C. Under these conditions, the produced coconut milk powder had a pH value of 6.12, a moisture content of 4.56%, a solubility of 98.74%, a product mass of 24.99 grams and an overall percentage of product mass of 21.32%.
Effectiveness of Silica Sulphate Catalyst Based on Rice Husk Ash in The Oleic Acid Esterification Process Lidya Elizabeth; Ade Rifqi Maulana; Anisa Dwi Febriani; Saripudin; Eko Andrijanto
Fluida Vol. 17 No. 2 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v17i2.5279

Abstract

Rice husk contains a lot of silica, so it is widely used as research material. One example is as a raw material for the synthesis of silica sulfate. Silica sulfate was synthesized using the sol-gel method with an impregnation time of 6 hours and 2 hours of calcination with variations in calcination temperature of 400-800oC. The analysis carried out on the silica sulfate catalyst is the analysis of acid concentration and FTIR. The best acid concentration results were 0.86 mmol/gram at 400oC. Characterization with FTIR showed similar peaks between silica and silica sulfate. The -OH and Si-O groups appeared at the peak of the analysis results, indicating that the synthesis of silica from rice husk had been carried out successfully. Modifying silica with sulfuric acid is not obvious through FTIR because the S-OH groups of sulfate ions overlap with the silica atoms in siloxane. The resulting silica sulfate is used as a catalyst in the esterification reaction of oleic acid with methanol. The esterification process was carried out at 60oC and varied with independent variables, namely catalyst loading (5-10%-b), time (2-4 hours), and molar ratio (1:6-1:12). The experimental design was determined using the Response Surface Method (RSM) using Design Expert. From the study results, the best variation obtained was a conversion of 87.03% with a variation of catalyst loading of 7.5%-b, a time of 4 hours, and a molar ratio of 1:12.
Efektivitas Katalis Heterogen Fly Ash (FA-SO3H) pada Sintesis Biodiesel dari Palm Fatty Acid Distillate Sudrajat Harris Abdulloh; Eko Andrijanto; Saripudin Saripudin; Anindya Indrita Putri; Dhea Nurul; Lidya Elizabeth
Fluida Vol. 17 No. 1 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v17i1.5286

Abstract

The increase in fuel use along with the decline in production of petroleum exploration activities encourages efforts to find alternative fuels, one of which is biodiesel from PFAD (Palm Fatty Acid Distillate) with production reaching 6,000,000 tons while its utilization is still low. Biodiesel production from PFAD using Fly ash (FA)-SO3H catalyst which is a heterogeneous catalyst through esterification method. FA used in this study was wet impregnated using 6M sulfuric acid (H2SO4) for 24 hours, so that the highest acid concentration was obtained at a calcination temperature of 500 ⁰C of 1.1654 mmol/gram. The research was conducted with Response Surface Method (RSM) with Box Behnken Design model in Design Expert 13 software and 13 runs were obtained. The resulting model from RSM was obtained as optimum conditions at catalyst loading (%-w) 5-10, methanol:PFAD molar ratio (n/n) 10:1-30:1, reaction time 3-5 hours and temperature 60 ⁰C. Based on the experimental results and ANOVA, the high conversion is influenced by the high catalyst loading and methanol:PFAD ratio (n/n), with the conversion obtained of 72.89% at catalyst loading of 10%-w, methanol:PFAD molar ratio of 20 (n/n) and time for 5 hours.
Study of the effect of changes in cell output temperature on the net efficiency of solid oxide fuel cell power generation Handrea Bernando Tambunan; Ignatius Riyadi Mardiyanto; Lina Troskialina; Sri Paryanto Mursid; Lidya Elizabeth; Dhyna Analyes Trirahayu; Retno Dwijayanti
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 24, No 4: August 2026
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v24i4.27828

Abstract

Solid oxide fuel cell (SOFC) power plants offer a promising pathway toward highly efficient energy conversion compared to conventional systems. This study explores the impact of output temperature variations on system performance through simulation analysis. The results demonstrate that increasing the temperature difference between the fixed input (700 °C) and the cell output significantly enhances net efficiency, while gross efficiency remains relatively stable. At an output temperature of 875 °C, the system achieves a net efficiency approaching 50% and a gross efficiency of approximately 61%. These findings emphasize the critical role of output temperature in determining overall system efficiency and highlight the importance of thermal management in SOFC operation.
Co-Authors Ade Rifqi Maulana Ahya Siti Hasanah Alifia Nuraeni Andrijanto, Eko Anindya Indrita Putri Anisa Dwi Febriani Ari Marlina Astri Nur Istyami Awalum Melanitria Bambang Soeswanto Bambang Soeswanto Chandra Aztaris Dhara Firdausa Dhea Nurul Dhyna Analyes Trirahayu Dini Sri Wahyuni Dini Sri Wahyuni Doko, Marthen Luther Emmanuela Maria Widyanti Endang Kusumawati Endang Kusumawati Endar Puspawiningtiyas Fifi Yani Godlief F. Neonufa Handrea Bernando Tambunan Herawati Budiastuti Hidayatulloh, Irwan Ignatius Riyadi Mardiyanto Intan Puspitarini Kartika Dian Pratiwi Kartika Dian Pratiwi Laily Isna Ramadhani Meiti Pratiwi Moch Adli Darojat Mursid, Sri Paryanto Nancy Siti Djenar Nurcahyo Paramitha, Tifa Putra, Okky Indra Rahmat Dani Dwi Fedianto Ramadhani, Laily lsna Retno Dwijayanti Rispiandi Rispiandi Ronny Purwadi Saripudin Saripudin Saripudin Sheilla Aulia Sofiatul Mardiah Shoerya Shoelarta Sindy Rizkia Salsabila Sudrajat Harris Abdulloh Tasya Shafira Widjaya Tatang H. Soerawidjaja Trirahayu, Dhyna Analyes Troskialina, Lina Widiastuti, Endang Widyanti, Emmanuela Maria Yulistiani, Fitria