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All Journal International Journal of Renewable Energy Development Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Sinergi Journal of Advanced Civil and Environmental Engineering
Anda, Martin
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Agriculture, Biological Sciences & Forestry Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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Numerical Analysis of Velocity Magnitude on Wave Energy Converter System in Perforated Breakwater Setyandito, Oki; Nizam, Nizam; Pierre, Andrew John; Suputra, Gede Dharma; Wijayanti, Yureana; Anda, Martin
International Journal of Renewable Energy Development Vol 11, No 1 (2022): February 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.38535

Abstract

Waves are an alternative energy source that can be used for electricity generation. Wave Energy Converter (WEC) system in perforated breakwater is potentially applicable WEC system for coastal area. The magnitude of wave energy generated is determined by the volume of sea water inside the perforated breakwater. This volumetric flow rate is calculated using the flow velocity at perforated holes on the structure slope. Therefore, this research aims to study the velocity magnitude by analyzing the interrelation among wave steepness, wave run-up and relative velocity. The method used consists of applying numeric 3D flow model in the perforated structure of the breakwater with the variation of wave height, wave period and structure slope. The result shows that, the steeper the structure, the bigger is the relative run up (Ru/H). The higher the relative run up, the higher are the relative run-up velocities (V/Vru). As the velocity increase, the volumetric flow rate inside perforated breakwater will be higher, which leads to higher wave energy. Hence, it can be concluded that the higher the velocities (V/Vru), the higher is the wave energy generated.
Quantifying environmental impact: carbon emissions analysis of cut and fill work in construction Keintjem, Militia; Suwondo, Riza; Suangga, Made; Juliastuti, Juliastuti; Anda, Martin
SINERGI Vol 28, No 3 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2024.3.006

Abstract

The construction industry plays a pivotal role in global development, but it also significantly contributes to carbon emissions, necessitating urgent measures to mitigate its environmental impact. The main objective of this research is to analyse and estimate the carbon emissions resulting from cut and fill work in construction projects. This research conducted three comprehensive case studies focusing on heavy equipment excavation, material transport, material spreading, and compaction stages in the construction industry to analyse carbon emissions. The findings reveal that material transport emerges as a prominent source of CO2 emissions within the construction life cycle. This underscores the urgent need for transformative measures to optimize transportation logistics and adopt eco-friendly alternatives, such as electric or hybrid vehicles, for material transport. Additionally, the study highlights the importance of integrating intermodal transportation options to maximize efficiency while minimizing emissions during material movement. The research emphasizes that mitigating carbon emissions in the construction industry requires a comprehensive approach encompassing technological advancements, logistical optimization, and the adoption of sustainable practices. By embracing the strategies highlighted in this study, construction projects can significantly contribute to the global fight against climate change and align with international efforts to achieve a more sustainable future. The insights provided by this research underscore the imperative for collaboration among stakeholders to drive meaningful change and foster a more sustainable and environmentally conscious construction industry.
Cellulose Hydrolysis of Mask Waste Using Aspergillus niger and Eco-Friendly Microwave Pretreatment Gilbran, Adam; Nafilah, Syahraini; Layalia, Afina Rista; Arsyad, Wifqul Muna; Darmawan, Andi; Setiawan, Risqi Prastianto; Irviandi, Risnu; Kusdiyantini, Endang; Nurauliyaa, Aida Habibah; Anda, Martin; Sasongko, Nugroho Adi; Wahyono, Yoyon
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 22, No 3 (2025): November 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v22i3.993-1001

Abstract

The management of used medical mask waste has become a significant issue due to the increased volume of waste during and after the pandemic. Medical mask waste contains cellulose compounds that can be converted into derivatives such as glucose, which are then processed into bioethanol as an alternative energy source. This study aims to hydrolyse medical mask waste using cellulase enzymes from Aspergillus Niger to produce glucose. The cellulase enzyme composition was varied (5 ml, 15 ml, and 25 ml) to determine the optimal hydrolysis conditions. The glucose produced was measured using DNS reagent assay with spectrophotometry at a wavelength of 540 nm. The highest amount of glucose was obtained under optimal conditions with 25 ml of cellulase enzyme after 48 hours of hydrolysis, amounting to 88.16 ppm. Subsequently, the glucose from hydrolysis was fermented using Saccharomyces cerevisiae, and the fermentation product was analysed for ethanol concentration using GC-FID. The products of fermentation ware 0.017% ethanol concentration from mask waste fermentation. Hydrolysis is an environmentally friendly alternative solution for handling mask waste.
Performance and Durability of High-Volume Fly Ash Concrete Incorporating Bacillus safensis : A Comparative Study of Class C and Class F Fly Ash Amini, Iqlima Nuril; Syah, Dzikrie Fikriyan; Setiamarga, Davin H. Ekaputra; Basoeki, Makno; Danardi, Luki; Laory, Irwanda; Anda, Martin; Maulana, Mahendra Andiek; Wulandari, Meity; Ekaputri, Januarti Jaya
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 8, No 2 (2025): October
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.8.2.8-21

Abstract

This study investigates the performance and durability of high-volume fly ash (HVFA) concrete enriched with Bacillus safensis, focusing on the comparative influence of Class C and Class F fly ash. Concrete mixtures were prepared with varying proportions of both fly ash types, with and without microbial addition, and tested for fresh and hardened properties including compressive strength, splitting tensile strength, porosity, and workability. Durability was further evaluated using the rapid chloride penetration test (RCPT) and accelerated corrosion test (ACT).Results showed that Class C fly ash, with its higher calcium content, produced a denser microstructure and improved early compressive strength. In contrast, Class F fly ash supported more favorable long-term microbial activity due to greater porosity and water availability. Incorporating Bacillus safensis enhanced compressive strength by up to 8% and significantly reduced chloride ion penetration, particularly in Class F fly ash concrete, through calcium carbonate precipitation within the pores. However, microbial addition was associated with reduced splitting tensile strength, likely due to differences in failure mechanisms. Long-term observations revealed strength gains of up to 13.3% after one year in microbial HVFA concrete.These findings demonstrate the synergistic contribution of Bacillus safensis and the effect of fly ash type to the improvement of sustainability and durability of HVFA concrete.
Co-Authors Amini, Iqlima Nuril Andi Darmawan Arsyad, Wifqul Muna Basoeki, Makno Danardi, Luki Endang Kusdiyantini G. Gunawan Gilbran, Adam I Dewa Gede Dharma Suputra Irviandi, Risnu Januarti Jaya Ekaputri Keintjem, Militia Laory, Irwanda Layalia, Afina Rista Maulana, Mahendra Andiek Nafilah, Syahraini Nizam Nizam Nugroho Sasongko Jati, Nugroho Sasongko Nurauliyaa, Aida Habibah Oki Setyandito, Oki Pierre, Andrew John Setiamarga, Davin H. Ekaputra Setiawan, Risqi Prastianto Suangga, Made Suwondo, Riza Syah, Dzikrie Fikriyan Wahyono, Yoyon Wijayanti, Yureana Wulandari, Meity