Article Per Year (5 Year)
p-Index From 2020 - 2025
1.325
P-Index
This Author published in this journals
All Journal TEKNIK Eksergi: Chemical Engineering Journal Jurnal Rekayasa Material, Manufaktur & Energi Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Formosa Journal of Applied Sciences (FJAS) Journal of Biobased Chemicals (JOBC)
Sonya Hakim Raharjo
Unknown Affiliation
Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Public Health Social Sciences

Published : 7 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 7 Documents
Search

 1 
Efisiensi Energi dan Reduksi Harga Total Produksi Hidrogen pada Siklus Sulfur-Iodine Seksi III Skala Pilot Menggunakan Analisis Pinch Raharjo, Sonya Hakim; Winaningsih, Ima; Widayat, Widayat
TEKNIK Vol 41, No. 1 (2020): May 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (749.849 KB) | DOI: 10.14710/teknik.v41i1.24409

Abstract

Proses produksi hidrogen melibatkan perpindahan panas dari satu aliran proses ke aliran proses yang lain atau dari aliran utilitas ke aliran proses dan sebaliknya. Hal ini memotivasi untuk dilakukan proses efisiensi energi. Pada siklus sulfur-iodine seksi III, proses dekomposisi HI merupakan bagian penting karena merupakan proses terakhir untuk menghasilkan H2. Beberapa unit peralatan dan unit utilitas yang ada dalam sistem proses ini membutuhkan dan menghasilkan energi yang cukup besar. Ditemukan bahwa beberapa penggunaan sistem energi ini dapat dioptimalkan melalui proses analisis efisiensi energi menggunakan analisis pinch. Peneltian ini menggunakan perangkat lunak HINT untuk melakukan analisa pinch dengan variasi minimum temperature approach (ΔTmin). Hasil analisa menunjukkan bahwa pada ΔTmin 10K diperoleh maximum energy recovery (MER) yang tinggi dan total harga produksi H2 yang paling rendah.
Utilization of Fly Ash and Zeolite to Reduce Chemical Oxygen Demand (COD) in Domestic Waste at the Al Ihya Ulumaddin Islamic Boarding School Cilacap Arnesya Ramadhani; Sonya Hakim Raharjo; Retno Dwi Nyamiati
Formosa Journal of Applied Sciences Vol. 2 No. 3 (2023): March 2023
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjas.v2i3.3347

Abstract

Domestic waste is the result of waste from various human activities. An alternative to reduce domestic waste is waste filtration. The purpose of this study was to find the best time for the filtration process using fly ash and zeolite to reduce COD levels in the domestic waste of the Al-Ihya Islamic Boarding School. The filter media is composed of 5 layers, namely gravel, palm fiber, zeolite, sand and fly ash. This research stage is to find the best filtration time from variations of 0, 90, 150 and 210 minutes. The resulting filtrate was tested for color and COD levels. The results show the best filtration time is 90 minutes. The color of the waste was originally cloudy black after being filtered for 90 minutes, the color changed to clear yellow. The original COD level was 1,932 mg/L after going through a filtration process for 90 minutes, decreasing to 310 mg/L.
Pembuatan Biobriket dari Limbah Daun dan Batang Kayu Putih (Malaleuca leucadendron) Guna Memanfaatkan Limbah Hasil Pertanian di Kecamatan Jeruklegi Kabupaten Cilacap Sonya Hakim Raharjo; Fatiha Nur Etnanta; Rosmawati Sipayung; Ebeng Sugondo; Asmaq Yuliah
Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Vol. 5 No. 1 (2023): JPPL, Maret 2023
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/jppl.v5i1.1762

Abstract

Oil reserves are increasingly decreasing in line with the use of non-renewable fossil fuels. One of the renewable energy sources is biomass. Some of the advantages of biomass briquettes are that they are environmentally friendly, more economical, and have better efficiency than coal briquettes. Eucalyptus leaves and stems (M. leucadendron) are the example of the biomass wastes that can be utilized as raw material for briquettes. The objectives of this research are to : Examine the fabrication of biobriquettes from the waste leaves and stems of eucalyptus (M. leucadendron); Examine the effect of the ratio of eucalyptus leaf and stem waste and adhesive on the characteristics of biobriquettes; Examine the effect of carbonization temperature of eucalyptus leaf and stem waste on the characteristics of biobriquettes; and Examine the effect of carbonization time of eucalyptus leaf and stem waste on the characteristics of biobriquettes. The biobriquettes fabrication process starts with the preparation of raw materials (drying), carbonization of biomass with a furnace, mixing raw materials with tapioca flour as adhesive, molding dough, and drying. Variable 6 with leaves and stems ratio is 5:1, with carbonization temperature of 800°C and carbonization time of an hour produces the best biobriquette product of water content 2.21 % and ash content 25.08%.
Ekstraksi Senyawa Bioaktif Kulit Kopi dengan Pelarut Aseton Menggunakan Metode Microwave Assisted Extraction dan Analisis Senyawa Fenoliknya Julieta, Theressa; Helda Wika Amini; Ansori Ansori; Yukti Nurani; Ratri Sekaringgalih; Sonya Hakim Raharjo; Merymistika Yufrani Afred
Journal of Biobased Chemicals Vol. 4 No. 2 (2024): Journal of Biobased Chemicals
Publisher : Program Studi Teknik Kimia Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v4i2.1357

Abstract

Dewasa ini, pemanfaatan kulit buah kopi hanya terbatas sebagai pakan ternak dan pupuk. Maka dari itu, dilakukan penelitian dengan memanfaatkan limbah kulit kopi robusta sebagai bahan baku penelitian. Tujuan dilakukannya penelitian ini antara lain untuk mengetahui pengaruh dari beberapa variabel dan mengetahui kondisi optimum dalam proses ekstraksi senyawa bioaktif limbah kulit kopi. Limbah kulit kopi akan diekstrak menggunakan metode Microwave-Assisted Extraction (MAE) dengan pelarut aseton, dengan beberapa variabel yaitu rasio bahan terhadap pelarut, daya microwave, dan waktu ekstraksi. Analisis identifikasi adanya kandungan senyawa fenolik kemudian juga dilakukan menggunakan spektrofotometri UV-Vis. Variabel rasio bahan, waktu ekstraksi, dan daya microwave terbukti saling berkaitan, sehingga dapat menghasilkan total fenol pada kondisi optimum. Kondisi optimum dalam proses ekstraksi senyawa bioaktif limbah kulit kopi diperoleh pada variabel rasio bahan 0,04 g/ml ; waktu 9 menit ; dan daya 300 watt, dengan hasil total fenol sebesar 8,65 GAE/g sampel.
Sintesis dan Karakterisasi Kalsium Karbonat Presipitat dari Limbah Cangkang Telur melalui Metode Karbonasi Sekaringgalih, Ratri; Laili Rachmah, Alif Nur; Raharjo, Sonya Hakim; ., Ansori
Rekayasa Material, Manufaktur dan Energi Vol 8, No 2: JULI 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i2.24583

Abstract

Precipitated Calcium Carbonate (PCC) is a synthetic form of calcium carbonate (CaCO₃) with a dominant calcite crystal structure, widely used in various industrial applications such as fillers in the paper, plastic, paint, and pharmaceutical industries. This study aims to synthesize PCC from chicken eggshell waste through the carbonation method and determine the optimum conditions based on variations in sulfuric acid (H₂SO₄) concentration and carbonation time.The synthesis process begins with a reaction between eggshell powder and H₂SO₄ solution to produce calcium sulfate (CaSO₄), which is then converted into a Ca(OH)₂ solution through dissolution and precipitation. This solution is subsequently carbonated using CO₂ gas to produce PCC precipitate. Variations in H₂SO₄ concentration used were 1 M, 1.5 M, and 2 M, while the carbonation times were 60, 75, and 90 minutes. The synthesized PCC was characterized using Fourier-transform infrared spectroscopy (FTIR), X-ray fluorescence (XRF), and X-ray diffraction (XRD).Based on the analysis results, the optimum condition was achieved at 2 M H₂SO₄ concentration and 90 minutes of carbonation. Under these conditions, XRD analysis showed a diffraction pattern characteristic of calcite as the dominant crystal form, while FTIR analysis exhibited sharp absorption peaks of the carbonate group (CO₃²⁻) in the range of 1400–870 cm⁻¹, indicating a high CaCO₃ content in the sample. XRF analysis confirmed a calcium content of 89.88% in the resulting PCC product. These results demonstrate that chicken eggshell waste has great potential as an environmentally friendly alternative raw material for the production of PCC using the carbonation method.Keywords: Precipitated Calcium Carbonate (PCC), eggshell, carbonation method, H₂SO₄
Pelatihan Pembuatan Pupuk Organik Cair dari Limbah Kulit Kopi di Desa Pakis Jember Amini, Helda Wika; Rizkiana, Meta Fitri; Palupi, Bekti; Hidayati, Nurul; Raharjo, Sonya Hakim; Nurani, Yukti; Aziz, Mohamad Naufal Nizaar; Saputri, Ocha; Permatasari, Intan; Fandora, Ardan Jauza; Adriansyah, Muhamad; Nurjannah, Lailia; Rachman, Darryl Akeyla; Firmansyah, Alex; Devara, Arighy Zahirah Faiqy; Ulfiani, Khoirun Nisya'
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 8 No 1 (2025): Community Empowerment through Higher Education Community Service Programs
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v8i1.583

Abstract

Indonesia is one of the largest coffee-producing countries in the world. Indonesia recorded a large coffee harvest capacity reaching 774.96 thousand tons in 2022. The coffee processing naturally results in coffee hull waste that continues to be produced in large quantities. About 40 to 48% of the coffee hull composition contained in a coffee cherry is often discarded during processing and is not optimally utilized. One sustainable solution that can be implemented is processing coffee hull waste into liquid organic fertilizer (POC) through fermentation with EM4. This community service program was implemented in Pakis Village, Panti District, Jember Regency, which has 441.40 hectares of coffee plantations with an annual production of around 1,200 tons of robusta coffee. The program includes bioreactor development, socialization, and training for the community regarding the processing of coffee hull waste into POC. The result is increased community knowledge and skills as well as economic benefits for coffee farmers in Pakis Village through improved soil productivity. The results of the activities showed that the clarity of the knowledge with community needs increased to 70%, public interest in POC activities increased to 85%, and resulted in public satisfaction of 95%.
Optimization of Rotation Speed, Disc Diameter, and Lighting Time in Batik Waste Treatment Using Rotary Algae Biofilm Reactor (RABR) with Ulva sp. Raharjo, Sonya Hakim; Palupi, Bekti; Syaifullah, Rangga Yudha; Yohanes; Sekaringgalih, Ratri; Hidayati, Nurul
Eksergi Vol 22 No 3 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i3.15084

Abstract

Batik is one of the cultural heritages in Indonesia that must be maintained and preserved. The batik industry process itself produces liquid waste that comes from the coloring processing, washing, wax removing, also rinsing. Batik waste, if not treated properly, can harm the environment. Various studies have shown that effluent treatment using the Rotary Algae Biofilm Reactor (RABR) method is promising. This research focuses on improving the RABR design and optimal conditions for treating batik wastewater, as well as utilizing the synergy between batik production and Ulva sp. The variables used in this research are the rotation speed of 20, 30, and 40 rpm, the lightning time for 0, 6, and 12 hours, and the disk diameter size of 9, 11, and 13 cm. The parameters that analyzed are BOD, COD, and pH levels. Waste treatment optimization in this research uses the RSM with a combination of Design Expert 13 software. Based on the results, the most optimal batik wastewater treatment variable is when the disk diameter is 10.306 mm, the rotation speed is 20 rpm, and the lightning time is 7.805 hours, yielding response values of 55.673 mg/L for BOD, 25.538 mg/L for COD, and 10.406 for pH.
Co-Authors . Widayat Adriansyah, Muhamad Ansori Ansori Arnesya Ramadhani Asmaq Yuliah Aziz, Mohamad Naufal Nizaar Bekti Palupi Devara, Arighy Zahirah Faiqy Ebeng Sugondo Fandora, Ardan Jauza Fatiha Nur Etnanta Firmansyah, Alex Helda Wika Amini Helda Wika Amini Intan Permatasari Julieta, Theressa Laili Rachmah, Alif Nur Merymistika Yufrani Afred Meta Fitri Rizkiana Nurani, Yukti Nurjannah, Lailia Nurul Hidayati Nyamiati, Retno Dwi Rachman, Darryl Akeyla Ratri Sekaringgalih Rosmawati Sipayung Saputri, Ocha Syaifullah, Rangga Yudha Ulfiani, Khoirun Nisya' Winaningsih, Ima Yohanes Yukti Nurani