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All Journal Jurnal Matematika & Sains Phi : Jurnal Pendidikan Fisika dan Terapan Elkawnie Jurnal Fisika FLUX CIRCUIT: Jurnal Ilmiah Pendidikan Teknik Elektro Lingkar : Journal of Environmental Engineering Jurnal Ilmiah Mahasiswa Fakultas Tarbiyah dan Keguruan UIN Ar-Raniry IJES : Indonesian Journal of Environmental Sustainability.
Mulyadi Abdul Wahid
(Scopus ID: 55480889700, H-index: 3) Department Of Environmental Engineering, State Islamic University Of Ar-Raniry, Banda Aceh
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Other

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Journal : IJES : Indonesian Journal of Environmental Sustainability.

 1 
INVESTMENT ANALYSIS OF A 5 MW GEOTHERMAL BINARY CYCLE POWER PLANT Nur, Suardi; Mulyadi Abdul Wahid
Indonesian Journal of Environmental Sustainability Vol. 1 No. 2 (2023): December 2023
Publisher : Center for Environmental Studies, Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ijes.v1i2.4246

Abstract

Indonesia is blessed with around 27.510 MWe of geothermal resources. Amongst the numbers, some resources are identified as small-scale geothermal resources. The development of small-scale geothermal resources is quite challenging either to government or private developers due to their low selling price that varies from USD 6.50 cent/kWh to USD 9.76 cent/kWh depending on the location and capacity. The challenges can be multiplied in the case of the electricity produced from a geothermal power plant that located isolated grid, where the electricity is unable to be transmitted to another load areas. Therefore, the electricity production will be limited to only serve the demand in the island that consequently will limit the revenue from electricity sales. This study analyzes the financial aspect of a binary geothermal power plant with gross installed capacity of 5 MW located in isolated island. The analysis shows the power plant will be financially feasible when the electricity selling price is over USD 30 cent/kWh that will generate 12% of IRR which is assumed as feasible target for this project. Furthermore, if environmental benefit is included the project can be feasible at lower selling price of USD 25 cent/kWh.
COD REMOVAL PERFORMANCE USING COMBINATION OF SPENT COFFEE GROUNDS ACTIVATED CARBON AND RIVER SAND AS FILTRATION MEDIA IN TOFU INDUSTRIAL WASTEWATER Arief Rahman; Mulyadi Abdul Wahid; Sapriyadi
Indonesian Journal of Environmental Sustainability Vol. 3 No. 1 (2025): June 2025
Publisher : Center for Environmental Studies, Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ijes.v3i1.7663

Abstract

Tofu industrial wastewater contains a high level of chemical oxygen demand (COD), which may cause negative impacts if not treated before being discharged into the environment. Filtration is one of the simple and effective methods for COD removal in tofu industrial wastewater, utilizing filtration media such as sand and activated carbon. The objective of this research is to evaluate the performance of spent coffee grounds (SCG) activated carbon and river sand as filtration media in COD removal from tofu industrial wastewater. The research was carried out using a dual media filtration unit composed of SCG activated carbon and river sand, with media thicknesses of 15 cm and 30 cm, respectively. The results show that the combination of SCG activated carbon and river sand as filtration media can reduce the COD level in tofu industrial wastewater from 928 mg/L to 307 mg/L (66.92%), although it still does not meet the quality standard (300 mg/L). Based on the findings, it can be concluded that the combination of SCG activated carbon and river sand has the potential to lower COD levels in tofu industrial wastewater, but further improvement is required to enhance its effectiveness.
Co-Authors Abd Mujahid Hamdan Al-Hafidh Rahman Arief Rahman Fitriyawany Fitriyawany Hadi Kurniawan Ichsan Setiawan Irsyadi, Ilham Firnando Khairan AR Melliati Muhammad Fadhil Zainuddin Muhammad Muhammad Muhammad Tri Fajar Muhammad Zaini Nanda, Resi Rizki Ocha Maulia Fadli Prajana, Andika Rafiza Mustaqin Rahmad Maulana Rahmadhani, Fitria Rohendi, Aulia Rusdy Sapriyadi, Wandi Shelvya Mulya Ivana Suardi Nur Syamsul Rizal Taufiq Iskandar Vebri Vazilla