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Manik, Tetti Novalina
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Bio-briquettes from tea fluff biochar: a response surface methodology study on particle size, resin gum-adhesive, and used cooking oil immersion time Suryajaya, Suryajaya; Agustian, Egi; Haryanti, Ninis Hadi; Prasetia, Hafiizh; Rahmah, Siti; Kurniawan, Hendris Hendarsyah; Wianto, Totok; Ramadhoni, Benni F; Manik, Tetti Novalina; Annisa, Nova; Rezamela, Erdiansyah; Sulaswatty, Anny
International Journal of Renewable Energy Development Vol 14, No 5 (2025): September 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.60877

Abstract

Fluff tea is the residual solid waste generated in the green tea industry and holds the potential for development as a solid fuel in bio-briquettes. This study transformed fluff tea into bio-briquettes utilizing biochar produced through slow pyrolysis. The study aimed to optimize bio-briquettes production from fluff tea using the Response Surface Methodology (RSM) approach through proximate analysis. The cylindrical bio-briquettes were produced using biochar particle sizes of 850, 500, and 150 μm, resin gum adhesive concentrations of 10%, 15%, and 20%, and immersion times in cooking oil of 0, 3, and 6 minutes. The results showed that the overall response by the p-value was <0.05, and the lack of fit was insignificant (p-value >0.05). The findings indicated that the calorific value of tea fluff rose from 4,482.56 cal/g to 6,374.98 cal/g after conversion to biochar. The optimum conditions for producing tea fluff bio-briquettes were a particle size of 850 μm, adhesive concentration of 11%, and immersion time of 5 minutes. The bio-briquettes exhibited a moisture content of 3.53%, ash content of 5.65%, volatile matter of 14.75%, fixed carbon of 76.14%, calorific value of 7,796.37 cal/g, combustion rate of 0.11 g/min, density of 1.22 g/cm3, and compressive strength of 35.57 N/cm2. Most tea fluff briquettes' properties had met Indonesia's briquettes standard. The production of bio-briquettes from tea fluff waste is a viable alternative fuel for both industrial and domestic applications.
Geofisika dan Geokimia Lahan Gambut Terdegradasi Tanah Timbun Manik, Tetti Novalina; Purba, Santi Carolina; Khayanti, Yuni Sri; Haryanti, Ninis Hadi; Sudarningsih, Rusdiansyah; Siregar, Simon Sadok
Lontar Physics Today Vol 4, No 2 (2025): June 2025
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/lpt.v4i2.23153

Abstract

Penelitian ini bertujuan untuk mengembangkan LKPD berbasis proyek yang valid dan praktis untuk melatihkan creative thinking skills dan self-regulated learning pada materi energi alternatif. Jenis penelitian ini adalah Design and Development Research (DDR) yang diadaptasi dari Richey Klien (2007) dengan menggunakan uji validitas yang terdiri atas validasi empiric dan validasi expert, serta uji kepraktisan yang terdiri atas uji keterbacaan, uji persepsi guru, dan uji respon peserta didik, uji keefektifan terdiri atas hasil analisis terlatihnya creative thinking skills dan self-regulated learning dalam kelompok kecil. Hasil uji validasi empiric dilihat berdasarkan keberhasilan produk biobaterai. Hasil uji validasi expert didapatkan rata-rata nilai dari ketiga expert sebesar 3,24, dengan rata-rata nilai pada aspek media dan desain diperoleh sebesar 3,32 dengan kategori sangat valid, dan aspek materi dan konstruk diperoleh sebesar 3,15 dengan kategori valid. Hasil uji kepraktisan diperoleh skor rata-rata untuk uji keterbacaan sebesar 83,8% dengan kategori sangat praktis, uji persepsi guru sebesar 87,3% dengan kategori sangat baik, serta uji respon peserta didik sebesar 84,7% dengan kategori sangat baik, didapatkan rerata skor uji kepraktisan sebesar 85,3% dengan kategori sangat praktis. Uji keefektifan dilihat berdasarkan hasil analisis terlatihnya creative thinking skills diperoleh hasil 81% dan analisis terlatihnya self-regulated learning diperoleh hasil 83,6%. Telah dihasilkan LKPD untuk melatihkan creative thinking skills dan self-regulated learning yang valid, praktis, dan efektif dalam kelompok kecil.
Kajian Morfologi Mineral Magnetik Tanah Permukaan Dari Daerah Industri Di Banjarmasin Sudarningsih, Sudarningsih; Ibrahim, Ibrahim; Manik, Tetti Novalina
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 1 (2025): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i1.434

Abstract

Penelitian untuk mengidentifikasi morfologi mineral magnetik dari tanah kawasan industri daerah Banjarmasin telah dilakukan. Sampel tanah tersebut dianalisis dengan menggunakan Scanning Electron Microscopy-Energy Dispersive X Ray Spectroscopy (SEM EDS) untuk mengetahui morfologi mineral magnetiknya. Keberadaan mineral magnetik di alam dapat menunjukkan kehadiran logam berat. Bentuk mineral magnetik pada sampel daerah penelitian didominasi oleh bentuk bulat sempurna dan bulat tidak sempurna yang diduga merupakan hasil proses antropogenik. Ukuran dari bulir mineral magnetiknya adalah multidomain (≥ 11–118,8 μm) dan pseudo single domain (≤ 3,7–9,5 μm).
Interpretasi Struktur Bawah Permukaan Menggunakan Metode Magnetik di Sekitar Gedung Auditorium ULM Banjarbaru, Kalimantan Selatan Safitri, Normala; Siregar, Simon Sadok; Sudarningsih, Sudarningsih; Manik, Tetti Novalina
Jurnal Natural Scientiae Vol 5, No 2 (2025)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jns.v5i2.17485

Abstract

Subsurface interpretation research has been carried out using the magnetic method with the aim of knowing the value of magnetic anomalies and subsurface rock structures around the ULM Banjarbaru Auditorium Building.In this study, data was collected using the PPM G-856 tool, which performed up to 55 measurements with a 5 m spacing between points.  According to the research findings, the magnetic field anomaly values in the study area range -1252.2 nT – 1725.4 nT. The 2D modeling results show that the study area is the Dahor formation, which consists of claystone,siltstone, and rock sand. The results of measuring the susceptibility value of each rock are 0.01; 0.015 and 0.018 SI for claystone,  0.001 and 0.0011 SI for siltstone, and 0.02 SI for rock sand.
Co-Authors Akbar, Arief Rahmad Maulana Anny Sulaswatty, Anny Az Zahra, Aisyah Nur Budi Kristanto Darminto . Dewi Sri Susanti Egi Agustian Erdiansyah Rezamela, Erdiansyah Gusti Atika Urfa Hafiizh Prasetia, Hafiizh Hendris Hendarsyah Kurniawan, Hendris Hendarsyah Hindarto, Imam Ibrahim Ibrahim Ida Ayu Putu Sri Widnyani Iwan Yahya Khayanti, Yuni Sri Krisdianto Sugiyanto Mashuri Mashuri Meilina, Putri Muhammad Zainuri Nasrulloh, Amar Vijai Ninis Hadi Haryanti, Ninis Hadi Nova Annisa, Nova Oni Soesanto Purba, Santi Carolina Rahmat Eko Sanjaya Rahmat Yunus Ramadhoni, Benni F Rasjava, Achmad Ramadhanna'il Safitri, Normala Santoso, Tanto Budi Sembiring, Rinawati Shaliha, Shaliha Simon Sadok Siregar, Simon Sadok Sri Cahyo Wahyono Suarso, Eka Sudarningsih Sudarningsih Sudarningsih, Rusdiansyah Suryajaya Suryajaya, Suryajaya Susilo, Tanto Budi Sutomo Sutomo Thresye Thresye Thresye,, Thresye, Totok Wianto Yuyun Hidayat