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Sekarsari Wibowo
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Agriculture, Biological Sciences & Forestry Humanities Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Nursing

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Pemanfaatan Model LandGem Untuk Potensi Gas Metana di TPAS Sekoto Menjadi Sumber Energi Sekar Nur Habibah Mahiroh; R Mohammad Alghaf Dienullah; Abdillah Akmal Karami; Sekarsari Wibowo
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Landfills generate methane gas (CH₄) as a result of the anaerobic decomposition of organic waste. This gas has the potential to serve as a renewable energy source if managed properly. This study aims to analyze the methane gas emission potential from the Sekoto landfill using the Landfill Gas Emission Model (LandGEM) and convert it into electricity and LPG. Annual waste generation data from 2021 to 2026 was used as input for the LandGEM model to estimate methane gas emissions. The modeling results indicate that peak methane production will occur in 2027, with a total of 4,247,951 m³/year. The potential electrical energy generated from this methane gas reaches 349,421,156.64 kWh per year, equivalent to 39,888.26 MWh. Additionally, the potential conversion of methane gas to LPG is estimated at 1,954,057.46 kg of LPG per year or approximately 5,353 kg per day. Utilizing methane from the Sekoto landfill as an alternative energy source not only contributes to renewable energy supply but also reduces greenhouse gas emissions that impact global warming. With a more efficient gas harvesting system and adequate processing infrastructure, methane gas can be converted into a more beneficial energy source for the community. This study confirms that optimizing landfill gas management can enhance energy sustainability while mitigating the environmental impact caused by methane emissions.
The Potential of Bacillus subtilis and Pseudomonas aeruginosa in Reducing Hg²⁺ Levels in Small-Scale Gold Mining Liquid Waste in Indonesia Sekarsari Wibowo; Abiyyu Armijn Firman Firdaus; Abdillah Akmal Karami
Jurnal Serambi Engineering Vol. 10 No. 3 (2025): Juli 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Mercury contamination resulting from artisanal and small-scale gold mining (ASGM) poses a significant threat to both environmental and human health. This study evaluates the effectiveness of two bacterial strains, Bacillus subtilis and Pseudomonas aeruginosa, in reducing mercury (Hg²⁺) concentrations in ASGM liquid waste. Methods: Experiments were conducted over seven days under controlled conditions, with two pH settings (neutral and alkaline), by monitoring total mercury reduction and bacterial growth (CFU/mL). Result and discussion: Results indicated that B. subtilis achieved the highest mercury removal efficiency—up to 90.07% at neutral pH and 89.51% at alkaline pH. P. aeruginosa also showed high efficacy, though slightly lower in comparison. Colony counts peaked on day two but declined by day seven, likely due to nutrient depletion and mercury toxicity, particularly at neutral pH. In contrast, control reactors without bacterial inoculation showed negligible changes in Hg concentration and no significant colony development. Conclusion: Despite the decline in bacterial counts over time, both strains remained functionally active, demonstrating strong adaptability and potential as effective bioremediation agents for mercury-contaminated wastewater. These findings support the integration of bacterial bioremediation as a viable component of sustainable mercury management in ASGM sectors.
DESAIN PROTOTIPE UNIT FILTRASI UNTUK PENGOLAHAN LIMBAH AIR WUDHU Mar’atus Sholihah; Vivin Setiani; Ria Rismawati; Nora Amelia Novitrie; Sekarsari Wibowo; Nur Fajar Aprilia Sari
Nusantara Hasana Journal Vol. 5 No. 5 (2025): Nusantara Hasana Journal, October 2025
Publisher : Yayasan Nusantara Hasana Berdikari

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This study aims to design and evaluate a simple prototype filtration unit for the treatment of ablution (wudhu) wastewater generated from religious facilities. Ablution water is categorized as domestic wastewater that is commonly discharged directly into the environment without prior treatment, although it still poses a potential risk of pollution. The developed prototype employs a multi-layer filter configuration consisting of palm fiber, zeolite, activated carbon, and sponge, with a total media height of 40 cm and an operational flow rate of 100 L/h. Based on design calculations, the system achieved a Hydraulic Loading Rate (HLR) of 0.4 m³/m²·h and an Empty Bed Contact Time (EBCT) of 60 minutes, indicating conservative hydraulic characteristics with a relatively long contact time. Performance testing showed that the filtration unit effectively reduced turbidity from 3 NTU to 1.2 NTU, achieving a removal efficiency of 88%, and increased the pH value from 5.6 to 7.0, thereby meeting the Class II water quality standard as regulated in Government Regulation No. 22 of 2021. These findings demonstrate that the designed filtration system is effective in improving the physical quality of ablution wastewater and has strong potential for application in public facilities such as mosques and educational institutions to support water conservation and sustainable wastewater management.
Co-Authors Abdillah Akmal Karami Abiyyu Armijn Firman Firdaus Mar’atus Sholihah Nora Amelia Novitrie Nur Fajar Aprilia Sari R Mohammad Alghaf Dienullah Ria Rismawati Sekar Nur Habibah Mahiroh Vivin Setiani