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All Journal Jurnal Pengabdian Masyarakat Bhinneka Bhinneka Multidisiplin Journal
Ojahan R, Tumpal
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Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Economics, Econometrics & Finance Education Languange, Linguistic, Communication & Media Public Health Social Sciences

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STUDI AWAL POTENSI CANGKANG TELUR SEBAGAI BAHAN BAKU BIO-KALSIUM OKSIDA MELALUI PROSES SINTERING DAN ANALISIS (X-ray Fluorescence) XRF: STUDI KASUS DARI LAMPUNG Satria N, Vastigo; Ojahan R, Tumpal
Bhinneka Multidisiplin Journal Vol. 2 No. 3 (2025): Bhinneka Multidisiplin Journal
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/bmj.v2i3.58

Abstract

Eggshell is a household waste that is rich in calcium carbonate (CaCO₃) and has potential as a bio-calcium oxide (CaO) raw material. Lampung Province, one of Indonesia's egg production centers, produces a considerable number of eggshells; however, the processing has not been optimal. This study aims to evaluate the utilization of eggshells as raw material for CaO through sintering and characterization using X-ray fluorescence (XRF). The processing included washing, drying, grinding, and roasting at 900°C. XRF analysis showed a CaO content of 98.865%, with minimal impurities. The findings suggest that local eggshells can serve as an alternative raw material for CaO, supporting the circular economy in MSMEs and communities, while also being environmentally friendly for both the agricultural and industrial sectors.
TRANSFORMASI LIMBAH GEOTERMAL MENJADI SUMBER SILIKA: TINJUAN POTENSI APLIKASI INDUSTRI Khadafi, Rama; Ojahan R, Tumpal
Bhinneka Multidisiplin Journal Vol. 2 No. 4 (2025): Bhinneka Multidisiplin Journal
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/bmj.v2i4.72

Abstract

Indonesia's vast geothermal potential (23.7 GW, 40% of global reserves) faces operational challenges from silica scaling amorphous SiO₂ deposition in pipelines and equipment. This review repositions scaling from a waste problem to a strategic resource, leveraging its high silica content (88–97%), amorphous structure, and unique morphology. Through systematic literature analysis, we identify two key scaling formation pathways (heterogeneous botryoidal layers and homogeneous 3D aggregates) influenced by temperature, pH, and flow dynamics. Silica scaling exhibits high surface area (up to 50 m²/g) and mesoporosity (2–50 nm), enabling extraction via alkali-acid processing into functional materials. Impurities (Fe, Al, Ca) are transformed into value-added components for catalysts, geopolymers, and composites. We map industrial applications adsorbents, ceramic fillers, and nanostructured materials based on material properties and local scalability. This circular economy approach reduces operational costs while creating new revenue streams. Key barriers include standardization gaps and supply chain integration, necessitating industry-geothermal sector collaboration for sustainable implementation in Indonesia.
Peningkatan Kompetensi Mahasiswa Mesin Melalui Pelatihan Autocad Berbasis Project Hartawan, Beny; Marjuni, Teuku; Prastyo, Adi; Ansyori, Anang; Hadi, R Agung Efriyo; Ojahan R, Tumpal
Jurnal Pengabdian Masyarakat Bhinneka Vol. 4 No. 3 (2026): Bulan Februari
Publisher : Bhinneka Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58266/jpmb.v4i3.1056

Abstract

Kemampuan dalam menguasai autocad merupakan hal yang penting dalam penugasan pembelajaran. Penguasaan autocad merupakan skill dasar yang penting bagi mahasiswa dalam mendukung pemahaman dan penerapan gambar teknik. Tujuan pelatihan ini adalah untuk meningkatkan kompetensi pengoperasian autocad berbasis project. Metode kegiatan terbagi dalam tiga fase, yaitu tahap perencanaan dan persiapan, implementasi kegiatan di lapangan, serta tahap evaluasi Evaluasi efektivitas dilakukan dengan pendekatan kuantitatif deskriptif melalui pre-test dan post-test. Hasil evaluasi menunjukkan peningkatan dari 52 % menjadi 72% yang mencerminkan peningkatan dalam pemahaman teknis mahasiswa dalam menggambar part mesin berbasis project. Peningkatan nilai terjadi secara merata pada tiga aspek yaitu penguasaan fungsi tools, keterampilan menggambar tampak dan potongan, serta kerapihan penyusunan gambar. Pemahaman dan keterampilan berbasis praktik langsung lebih efektif untuk pembelajaran keterampilan teknis.  
Co-Authors Anang Ansyori Hadi, R Agung Efriyo Hartawan, Beny Khadafi, Rama Marjuni, Teuku Prastyo, Adi Satria N, Vastigo