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All Journal Jurnal Energi Dan Manufaktur ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Journal of Energy, Mechanical, Material and Manufacturing Engineering Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Mineral, Energi dan Lingkungan QARDHUL HASAN: MEDIA PENGABDIAN KEPADA MASYARAKAT Humaniora Kumawula: Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian Masyarakat Bumi Raflesia ASEAN Journal of Chemical Engineering STEAM Engineering : Journal of Science, Technology, Education And Mechanical Engineering Jurnal Mineral, Energi dan Lingkungan Jurnal Surya Teknika Jurnal Difusi Industrial Research Workshop and National Seminar Jurnal Teknik Kimia dan Lingkungan Journal of Green Science and Technology
YANTI SUPRIANTI, YANTI
Politeknik Negeri Bandung
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Regenerasi In-Situ Adsorben Karbon Aktif Tipe Granul dengan Metode Termal Suprianti, Yanti; Kurniasetyawati, Annisa Syafitri
Jurnal Teknik Kimia dan Lingkungan Vol. 3 No. 1 (2019): April 2019
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (822.47 KB) | DOI: 10.33795/jtkl.v3i1.91

Abstract

Produk biogas memiliki spesifikasi yang masih perlu ditingkatkan (mengandung metana, CH4 50-70%, dan karbon dioksida, CO2 30 – 49%), agar dapat bersaing dengan gas alam, yaitu lebih dari 98% metana. Metode pemurnian melalui adsorpsi CO2 paling banyak diterapkan, karena tidak memerlukan biaya tinggi, jika dibandingkan teknologi pemisahan konvensional lain. Tetapi, media adsorben karbon aktif akan mengalami kejenuhan dalam waktu tertentu. Salah satu metode yang dapat digunakan untuk meregenerasi karbon aktif yang jenuh oleh CO2 yaitu dengan peningkatan temperatur melalui metoda termal. Pada penelitian ini dilakukan regenerasi in-situ dengan peningkatan temperatur karbon aktif di dalam kolom adsorpsi-desorpsi, dengan alat dapat mengakomodasi tiga pola operasi, yaitu adsorpsi, regenerasi/desorpsi, dan pengosongan gas. Alat terdiri atas kolom yang dilengkapi perpipaaan, blower pendorong udara, heater dan thermostat untuk pemanas dan pengatur temperatur udara. Hasil uji alat menunjukkan bahwa durasi proses adsorpsi hingga mencapai kejenuhan adalah 30 menit pada siklus pertama dan 40 menit pada siklus kedua. Selanjutnya, durasi proses desorpsi dari siklus pertama hingga ketiga menunjukkan peningkatan linier, dipengaruhi oleh temperatur udara pemanas, dengan penurunan konsentrasi Ca(OH)2 hingga masih menunjukkan tren peningkatan. Setelah dilakukan tiga siklus proses adsorspi-desorpsi didapatkan bahwa performa dari karbon aktif masih belum mengalami penurunan kapasitas. siklus proses adsorspi-desorpsi didapatkan bahwa performa dari karbon aktif masih belum mengalami penurunan kapasitas. Kata kunci: adsorpsi, desorpsi, karbon aktif, karbon dioksida, regenerasi in-situ, temperatur ABSTRACT Biogas have certain specifications that need to be improved (contain methane, CH4, 50-70%, and carbon dioxide, CO2, 30-49%), in order to compete with natural gas ( >98% methane). The adsorption of CO2 is the most widely applied to purify biogas since it considered as low cost, in terms of energy supply and raw materials. However, activated carbon adsorbent will be saturated and must be regenerated. One of the methods that can be used to regenerate CO2-saturated activated carbon is using thermal method. In this research, the in-situ regeneration was carried out by increasing temperature of the activated carbon in adsorption-desorption column, which accommodate three operating patterns, namely adsorption, regeneration/desorption, and gas discharge. The tool consists of columns, piping, blower, heater and thermostat for air heating and controlling temperature. The result showed that the saturation time was 30 minutes and 40 minutes, respectively in 1st and 2nd cycle. The duration of the desorption from the 1st to 3rd cycle showed a linear trend, influenced by heating air temperature. And the reduction in Ca(OH)2 concentration still showed increasing trend after three adsorption-desorption cycles carried out, so the performance or adsorption capacity of activated carbon had not yet been decreased.
POTRET BANK SAMPAH CEMPAKA 2 SEBAGAI MEDIA PENINGKATAN PERAN SERTA MASYARAKAT CIWARUGA DALAM PENGELOLAAN SAMPAH Muldiani, Ratu Fenny; Suprianti, Yanti; Widarti, Sri; Pratama, Defrianto; Koesoemah, Nita Henita; Agoes, Farida; Yuliyawati , Sri Nur
Jurnal Pengabdian Masyarakat Bumi Rafflesia Vol. 5 No. 3 (2022): Jurnal Pengabdian Kepada Masyarakat Bumi Raflesia
Publisher : Universitas Muhammadiyah Bengkulu

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Abstract

Kurangnya peran serta warga atau masyarakat RW 02 Ciwaruga, Kabupaten Bandung Barat dalam pengelolaan sampah walaupun telah memiliki Bank Sampah Cempaka 2, yang dibentuk sejak tahun 2016. Metode pelaksanaan kegiatan PKM ini  disesuaikan  dengan  kondisi dan waktu kegiatan Bank Sampah dengan langkah-langkah melakukan kunjungan dan diskusi dengan kader penggiat bank sampah, memotret dan mensosialisasikan tingkat keberhasilan bank sampah dilihat dari manfaat secara sosial dan ekonomi, serta merumuskan penyuluhan dan mempersiapkan berbagai media sosialisasi. Perilaku memilah sampah berpotensi untuk ditumbuhkan sebagai gerakan massal dan adanya Bank Sampah, secara ekonomi, sangat membantu dalam menciptakan pekerjaan dan menambah penghasilan masyarakat RW 02 Ciwaruga. Kata Kunci: Bank Sampah, Dampak Sosial, Ekonomi, Memilah Sampah  
PEMBERDAYAAN WARGA RW 14 CIBALIGO DALAM MENGOLAH SAMPAH ORGANIK MENGGUNAKAN KOMPOSTER AEROB SEDERHANA Suprianti, Yanti; Utami, Sri; Muldiany, Ratu Fenny; Gantina, Tina Mulya
Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 9, No 1 (2026): Kumawula: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kumawula.v9i1.62012

Abstract

Waste management has become an acute problem for the Bandung Raya area. The government has so far applied the landfill method at the final disposal site (TPA). This method is not an effective way to manage waste, as evidenced by the fire at the end of 2023 at the Sarimukti TPA, which resulted in a waste emergency in Bandung, driven by methane gas that emerged from the waste mountain. The decision of the West Bandung Regency government to limit the volume of waste transported and encourage people to manage their own waste has unsettled residents who are not ready to do so. This was observed in the RW 14 Cibaligo area, which led to organic waste piling up and causing health and environmental hazards. This issue must be resolved immediately by raising awareness among residents to manage their waste from home. This activity is carried out using counseling methods and practicing waste sorting and composting of organic waste, followed by monitoring the organic waste composting process in an aerobic composter, which produces two main products, namely compost and liquid organic fertilizer (POC). This activity has succeeded in increasing public knowledge and understanding regarding the sorting and processing of organic waste, and has led residents to produce fertilizer for their own needs. The results of compost and POC show good characteristics, based on aspects such as volume content, humidity, acidity level, compost temperature, as well as the presence of odors and animals, and aspects of dissolved solids concentration, salinity, conductivity, and acidity level of POC. These results are expected to encourage residents to remain consistent in managing their waste from their own homes, so that the environment becomes clean and healthy.Permasalahan pengelolaan sampah sudah menjadi beban akut wilayah Bandung Raya. Pemerintah selama ini menerapkan metode land fill di tempat pembuangan akhir (TPA). Metode ini bukan cara efektif dalam pengelolaan sampah, terbukti telah terjadi kebakaran pada akhir tahun 2023 di TPA Sarimukti yang mengakibatkan Bandung darurat sampah yang didorong oleh produksi gas metana dari gunungan sampah. Keputusan pemerintah Kabupaten Bandung Barat yang membatasi volume sampah yang diangkut dan mendorong masyarakat untuk mengelola sampahnya sendiri, menyebabkan kekagetan warga yang belum siap untuk melakukannya. Hal ini ditemui di wilayah RW 14 Cibaligo yang mengakibatkan sampah organik menumpuk dan menimbulkan bahaya kesehatan dan lingkungan. Hal ini harus segera diselesaikan, dengan menggugah kesadaran warga untuk mengelola sampahnya semenjak dari rumah. Kegiatan ini dilakukan dengan metode penyuluhan dan praktek pemilahan sampah serta  pengomposan sampah organik, diikuti dengan pemantauan proses pengomposan sampah organik dalam komposter aerob yang menghasilkan dua produk utama, yaitu pupuk kompos dan pupuk organik cair (POC). Kegiatan ini berhasil meningkatkan pengetahuan dan pemahaman masyarakat mengenai pemilahan dan pengolahan sampah organik, dan mengantarkan warga menghasilkan pupuk untuk keperluannya sendiri. Hasil kompos dan POC menunjukkan karakteristik yang baik, dengan meninjau aspek volume keterisian, kelembapan, tingkat keasaman, dan temperatur kompos, serta timbulan bau dan binatang yang muncul, juga aspek konsentrasi padatan terlarut, salinitas, konduktivitas, serta tingkat keasaman POC. Hasil ini diharapkan mendorong warga terus konsisten dalam mengelola sampahnya semenjak dari rumah sendiri, sehingga lingkungan menjadi bersih dan sehat.
Assessing the Readiness of Lecturers and Students in Adapting to Online Learning in Vocational Higher Education Utami, Sri; Suprianti, Yanti
Humaniora: Journal of Indonesia Culture and Society Vol. 13 No. 3 (2022): Humaniora
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/humaniora.v13i3.7639

Abstract

The research aimed to identify the teaching experience carried out by lecturers in vocational higher education, Department of Energy Conversion Engineering, dominated by practical lectures during online learning. Online learning carried out during the pandemic was one of the efforts to manage the learning process to suppress the coronavirus's spread (COVID-19). In the learning process, which involved students and lecturers, limitations were not only felt by students as participants in the learning process but also by lecturers who were in charge of the courses. Activities in the laboratory were undertaken at all levels and accounted for more than 40% of all learning activities. The experience of the online teaching process for vocational engineering education was very interesting to be researched since the challenges of delivering practical material had a 50% proportion of the entire course. Observations on laboratory activities during online lectures could be a reference for further learning activities. Qualitative methods were used by observation, data collection and compilation, and analysis. From the data that have been accumulated, it can be concluded that several components become obstacles in the online learning process for engineering/vocational higher education. However, some parts are also considered beneficial during the learning process for the lecturers and students. 
Effect of Ignition Point Location on Temperature Profile and Syngas Composition in Downdraft Gasification of Coconut Shell and Wood Sawdust Purwinda Iriani; Tina Mulya Gantina; Yanti Suprianti
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 2 (2026): April 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i2.801-810

Abstract

The utilization of biomass waste as an energy source, such as for hydrogen and methane gas production, can be achieved through the gasification process. This study aims to analyze the performance of biomass gasification using coconut shells and wood sawdust for syngas production, by comparing the effects of different ignition point positions on process effectiveness. The gasification process was carried out using a down-draft type gasifier reactor. Two main variables were examined: the type of biomass (coconut shell and wood sawdust) and the ignition point location (upper and middle positions). The measured parameters included temperature profiles and syngas composition (H₂ and CH₄). The results showed significant differences based on the ignition point position. The upper ignition point only reached relatively low temperatures (72–262 °C) within six minutes, whereas the middle ignition point achieved a much higher operational temperature (825 °C) after 10 min of ignition. Syngas analysis revealed that wood sawdust produced a higher hydrogen content (4.46%) compared to coconut shell (1.79%), while coconut shell produced a higher methane content (3.4%) than wood sawdust (1.17%). These findings indicate that ignition location plays a critical role in controlling the thermal zone development and gasification efficiency. Optimizing ignition position can significantly improve syngas quality and reactor performance in downdraft gasification systems.
Optimization Of Mixing Chamber Design on Steam Ejector at Geothermal Power Plant Based on CFD Simulation Rusdan, Sendi Salman; Suprianti, Yanti
Journal of Green Science and Technology Vol 9 No 3 (2025): Journal of Green Science and Technology Vol. 9 No. 3 December 2025 Special Editio
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i3.10689

Abstract

The initial generation capacity of 30 MW at the Geothermal Power Plant (GPP) decreased to 11.88 MW due to reduced steam supply from production wells. This mismatch between the original system design and current operating conditions affected components such as the steam ejector, which experienced a reduction in motive steam flow from 1.96 kg/s to 1.66 kg/s. As a result, the mixing chamber became inefficient in entraining flow of non- condensable gases (NCG), causing suboptimal pressure ratios (P3/P5), turbulence, and backflow. This study aims to redesign the mixing chamber of the steam ejector to enhance the extraction NCG. Using compressible flow theory and CFD simulation with Ansys Fluent 2025R1, the redesigned geometry improved the entrainment ratio from 0.27 to 0.31 and increased the NCG suction rate from 0.45 kg/s to 0.52 kg/s. The pressure ratio P3/P5 rose from 0.04 to 0.07, approaching optimal conditions. Further analysis revealed that under increased motive flow (1.687 kg/s), the ejector achieved an entrainment ratio of 0.32, and under lowered condenser pressure (8.1 kPa), the entrainment reached 0.34. These two optimal conditions demonstrate the redesigned chamber’s adaptability under varied operational scenarios. The performance improvement contributed to an additional power output of 41.68 kWh, approaching the plant’s installed capacity and improving system reliability. From economic perspective, the optimization is also feasible, yielding a net present value (NPV) of Rp6.46 million and demonstrating high profitability and practical applicability.
Co-Authors Aditya Fajar Nugraha Agoes, Farida Annisa Syafitri K Annisa Syafitri Kurniasetyawati Arya Wulung Defrianto Pratama Fadhila, Nisya Fitri Fajar Ramadhan Farida Agoes Fauziyyah, Zaida Sahla GANTINA, TINA MULYA Herawati Budiastuti Hermagasantos Zein Hernawan, Kholiq IRIANI, PURWINDA Iriani, Purwinda Koesoemah, Nita Henita KURNIASETIAWATI, ANNISA Kurniasetyawati, Annisa Syafitri Kurniawan Kurniawan Laksono Trisnantoro Muldiani, Ratu Fenny Nita Henita Koesoemah Purwadi Iriani PURWINDA IRIANI Rusdan, Sendi Salman Rusmana Sapto Prayogo Sri Nuryuliyawati Sri Utami SRI UTAMI Sri Widarti Sri Widarti, Sri Susilawati Teguh Sasono TINA MULYA GANTINA Tina Mulya Gantina Tritjahjono, Rachmad Imbang Wachjoe, Conny K. WACHJOE, CONNY KURNIAWAN Yoga Rahmat Pangestu Yulistiani, Fitria Yuliyawati , Sri Nur