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All Journal Teknologika
Rani Sri Wahyuni
Sekolah Tinggi Teknologi Wastukancana
Computer Science & IT Decision Sciences, Operations Research & Management Industrial & Manufacturing Engineering Mechanical Engineering Other

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Kajian Integrasi Pembangkit Listrik Tenaga Biomassa Berbasis Limbah Bauksit sebagai Substitusi Energi Fosil pada Operasional PT “X” Alumina Refinery, Kalimantan Barat Dedy Setyo Oetomo; Rani Sri Wahyuni; Farliana Sutartiah
Jurnal Teknologika Vol 16 No 1 (2026): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51132/teknologika.v16i1.672

Abstract

The increasing energy consumption in alumina refinery industrial operations drives the need for diversification of more sustainable energy sources. PT “X” Alumina Refinery (PT.”X”) in West Kalimantan consumes large amounts of fossil energy for the Bayer process including digestion, evaporation, and calcination stages. This study examines the potential integration of biomass power plants based on bauxite residue (red mud and oversize bauxite) and local West Kalimantan biomass (palm shell, wood powder, and rice husk) as partial fossil energy substitutes through co-firing and gasification technologies. The study was conducted using a techno-economic analysis approach with mathematical models of energy balance, thermal efficiency, and life cycle cost analysis. Results show that total energy potential from bauxite residue and local biomass reaches 319,009 GJ/year (10.11 MW equivalent) within the operational radius, and 485,600 GJ/year (42.7 MW equivalent) at the provincial scale. Implementation of 30% biomass co-firing in existing boilers can reduce coal consumption by 89,250 tons/year and save net energy costs of IDR 87.3 billion per year. Environmental assessment shows CO₂ emission reductions of 198,450 tons/year (63.8% of baseline emissions). Economic feasibility analysis yields NPV = IDR 412.8 billion, IRR = 18.7%, and a payback period of 5.3 years, confirming the project's financial viability and contribution to Indonesia's 2060 Net Zero Emission target
Evaluasi Inovasi Prioritas Smart City Di Kabupaten Bandung Barat Menggunakan Metode Fuzzy Logic Rizky Fajar Ramdhani Ramdhani; Hady Sofyan; Rani Sri Wahyuni
Jurnal Teknologika Vol 15 No 2 (2025): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51132/teknologika.v15i2.513

Abstract

This study aims to assess the implementation of smart city innovations in West Bandung Regency in 2024, utilizing a fuzzy logic-based approach. Unlike previous research, which relied on the Unified Theory of Acceptance and Use of Technology (UTAUT) model, this study employs fuzzy logic techniques to evaluate user satisfaction with 37 prioritized innovative city applications. Fuzzy logic is selected for its capability to process qualitative and subjective data, enabling a more adaptive assessment of user perceptions. Data were gathered through structured questionnaires and in-depth interviews with public service employees, who are the primary users of these digital platforms. Evaluation dimensions—including ease of use, perceived benefits, social influence, and facility availability—were translated into fuzzy sets and analyzed through a Mamdani fuzzy inference system to derive comprehensive satisfaction scores. The results reveal that the “Smart Branding: Visit KBB” and “BA QRIS” applications achieved the highest satisfaction levels, particularly in terms of usability and infrastructure support. The study offers fuzzy logic-based recommendations to enhance the effectiveness, acceptance, and strategic development of smart city innovations. It also proposes an alternative, more responsive evaluation method for policy-making in the context of digital governance. Keyword: smart city, fuzzy logic, user satisfaction, innovation, West Bandung Regency
Co-Authors Farliana Sutartiah Hady Sofyan Oetomo, Dedy Setyo Rizky Fajar Ramdhani Ramdhani