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SISTEM OTOMATISASI SKALA MINI ADSORPSI BESI DALAM AIR ASAM TAMBANG Paradise, Mycelia; Pratama, Yudha Agung
Jurnal Teknologi Mineral dan Batubara Vol 20 No 2 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No2.2024.1546

Adsorption is one alternative to acid mine drainage (AMD) management, particularly for reducing heavy metal concentrations. Adsorption is still performed manually at this time. In this study, the adsorption procedure is automated and controlled via Arduino rather than being performed manually. The efficacy of using an Arduino in the adsorption of AMD at a pH of 2.6 and an Fe initial concentration of 42.807 mg/L was assessed by modifying the adsorption time parameters. The results showed that the assembled instrument was able to reduce the Fe concentration to meet the quality standards in just 2 minutes. The effectiveness of Fe adsorption reached 96.79% with a final concentration of 1.3724 mg/L. Fe adsorption capacity reached 0.0414 mg/g in the second minute. The Fe adsorption process in this study is chemical adsorption.

SISTEM OTOMATISASI SKALA MINI ADSORPSI BESI DALAM AIR ASAM TAMBANG Paradise, Mycelia; Pratama, Yudha Agung
Jurnal Teknologi Mineral dan Batubara Vol 20 No 2 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No2.2024.1546

Adsorption is one alternative to acid mine drainage (AMD) management, particularly for reducing heavy metal concentrations. Adsorption is still performed manually at this time. In this study, the adsorption procedure is automated and controlled via Arduino rather than being performed manually. The efficacy of using an Arduino in the adsorption of AMD at a pH of 2.6 and an Fe initial concentration of 42.807 mg/L was assessed by modifying the adsorption time parameters. The results showed that the assembled instrument was able to reduce the Fe concentration to meet the quality standards in just 2 minutes. The effectiveness of Fe adsorption reached 96.79% with a final concentration of 1.3724 mg/L. Fe adsorption capacity reached 0.0414 mg/g in the second minute. The Fe adsorption process in this study is chemical adsorption.

Analysis of the Relationship Between Resistivity and Seawater Moisture Content Percentage in Loose Sand Medium on the Yogyakarta Coastal Area Pratama, Yudha Agung; Paradise, Mycelia; Suharsono, Suharsono; Hidayat, Wahyu; Setiahadiwibowo, Ajimas Pascaning
Indonesian Journal of Earth Sciences Vol. 5 No. 2 (2025): July-December
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52562/injoes.2025.1767

This study investigates the effect of seawater moisture content on the resistivity of unconsolidated sand in the coastal region of Yogyakarta. Laboratory experiments were conducted using a standard ASTM G-57 soil box with samples prepared at varying percentages of seawater moisture content. The results indicate that increasing seawater content in the sediment medium leads to an exponential decrease in resistivity. A mathematical relationship was established in the form of a power function: R=1145.7MC?2.23. Resistivity values tend to stabilize when the moisture content exceeds 13%. A resistivity range of 0.8–2.8 ??m is proposed as a cut-off for identifying seawater intrusion in coastal areas. These findings provide an important contribution to the development of geoelectrical methods for monitoring seawater intrusion and evaluating groundwater quality in coastal regions, which can serve as a basis for sustainable water resource management.

IMAGING DISPERSION CURVE OF DISPERSIVE WAVES USING SHORT-TIME FOURIER TRANSFORM: 2025 MYANMAR EARTHQUAKE M 7.7 Kurniawan, Muhammad Fachrul Rozi; Putra, I Putu Raditya Ambara; Pratama, Yudha Agung
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 3 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i3.490

Understanding of Earth's subsurface is crucial for mitigating geological hazards, particularly earthquakes. A key parameter for subsurface characterization is the surface wave dispersion curve, which strongly reflects shear wave velocity (Vs) at various depths. This study presents an extraction of dispersion curves from earthquake signals using the Short-Time Fourier Transform (STFT). The STFT method enables the analysis of non-stationary signals like earthquake signals by dividing them into small segment, assumed-stationary segments, then applying the Fourier Transform to each segment. This process generates a time-frequency spectrogram that represents the evolution of frequencies over time. Myanmar earthquake M 7.7 is one of the greatest earthquakes that have damaging impacts. We used three inline stations for evaluating the waveform at CHTO (Chiang Mai, Thailand), KAPI (Sulawesi, Indonesia), and WRAB (Tennant Creek, NT, Australia). Waveform for KAPI and WRAB stations categorized teleseismic event represented good penetration waves to image deeper subsurface layes. Surface waves clearly seen at KAPI and WRAB classified by very low frequency and high amplitude in wave group train. The spectrogram, energy peaks at each frequency can be identified, which directly correlate with the group velocity of the surface waves. STFT successfully extract dispersion curve of surface waves at KAPI and WRAB station. However, the dispersion curve could not be extracted at CHTO station because its too close to the epicentre resulted in significant interference of waves phase caused inseparable frequency spectrum on each wave phases. Remarks on the study is stations nearer to the epicenter exhibit a higher frequency and broader range of dominant frequency, while those farther away show a lower frequency and narrow frequency range. The advantage of the STFT method lies in its ability to enable the identification of dispersion modes with good time-frequency resolution.

Performance Evaluation of ADS 1256 for Geoelectric Data Acquisition System: Laboratory Scale Comparative Study Pratama, Yudha Agung; Suharsono, Suharsono
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.674

The need of flexible and affordable geoelectric data acquisition systems is growing, particularly for research and educational purposes. This study aimed to evaluate the performance of a resistance measurement system based on the ADS1256 high-precision ADC module on a laboratory scale. Initial testing was conducted on a laboratory scale using various resistance values. The best accuracy was found in the medium to high resistance range R1 (subsurface target) (>10 Ω); at low resistance, the accuracy value decreased dramatically. A relative error (ε) reading of - 6.7% occured at low values of R1. The condition of the resistance R2 (surface) affected the stability of the ADS 1256 system reading. Based on the standard deviation value there was an indication of nonlinearity in the readings, particularly in the voltage readings. The current measurements produced relatively stable readings. There was an increase in the fluctuation of readings, especially at low surface medium (R2). Overall, the ADS1256 system demonstrated promising potential as a low-cost alternative for resistance measurement, particularly effective in the medium to high resistance range. Comprehensive data across all R1 and R2 variations require additional calibration and enhanced circuit stability to better align with reference values

Penerapan Teknologi Geolistrik untuk Mendukung Penanganan Krisis Air Bersih di Masyarakat Paradise, Mycelia; Pratama, Yudha Agung; Zamroni, Akhmad; Kurniawan, Riski
Abdimas Mandalika Vol 5, No 3 (2026): April
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/am.v5i3.37967

Abstrak : Krisis air bersih di Desa Banyurejo, Kapanewon Tempel, Sleman, merupakan fenomena yang menarik untuk dikaji. Secara kenampakan permukaan wilayah ini memiliki potensi air tanah yang cukup. Namun, kondisi di lapangan menunjukkan keterbatasan ketersediaan air bersih. Pengabdian ini bertujuan untuk memahami kondisi bawah permukaan yang mempengaruhi keberadaan air tanah melalui kajian geofisika. Metode yang digunakan adalah geolistrik dengan konfigurasi Wenner–Schlumberger. Hasil pengukuran menunjukkan nilai resistivitas berkisar antara 3,7 Ω·m hingga 387 Ω·m yang mengidikasikan potensi saturasi air tanah. Variasi distribusi nilai resisitivitas secara lateral mencerminkan heterogenitas litologi bawah permukaan khususnya dibagian Banyurejo sisi selatan. Kondisi tersebut diduga membatasi kemenerusan akuifer dan meningkatkan kerentanan terhadap penurunan ketersediaan air tanah. Alternatif yang ditawarkan yaitu peningkatan sistem resapan dan pengaturan tata ruang.Abstract: The clean water crisis in Banyurejo Village, Tempel Subdistrict, Sleman, presents a significant case for investigation. Although the surface characteristics suggest adequate groundwater potential, field observations reveal restricted access to clean water. In light of these conflicting indicators, this study seeks to analyze subsurface conditions affecting groundwater availability using geophysical methods. Specifically, the geoelectrical method with the Wenner–Schlumberger configuration was employed. Measurement results showed resistivity values ranging from 3.7 Ω·m to 387 Ω·m, indicating potential groundwater saturation. Furthermore, variations in the lateral distribution of resistivity values reflect the heterogeneity of subsurface lithology, particularly in the southern part of Banyurejo. As a result, this condition is thought to limit the continuity of the aquifer and increase vulnerability to declining groundwater availability. To address these issues, alternatives offered include improving the infiltration system and spatial planning.

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