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All Journal International Journal of Marine Engineering Innovation and Research
Nita Ariestiana Putri
Institut Teknologi Kalimantan
Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Granulator Performance for Urea Granule Quality: A Study on Material Balance and Recycle Seed Ratio Jefri Pandu Hidayat; Muhammad Azi Kusuma; Nita Ariestiana Putri; Asful Hariyadi
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 1 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i1.4762

Abstract

Granulation is a critical process in quality of urea fertilizer, particularly their size distribution, significantly affects the product's performance and marketability. Urea synthesis begins with the reaction between ammonia and carbon dioxide, where ammonium carbamate is decomposed to produce urea by granulation process. This research aims evaluate the performance of granulator on urea granule size product quality based on material balance and recycle seed ratio (RSR). The granulator performance in the urea granulation process was evaluated for a production capacity of 3,500 tons/day. The methodology involves data collection from operational records in six days respectively, followed by mass balance analysis and product quality evaluation based on particle size distribution. The analysis revealed a significant deviation between design and actual data. Specifically, the design mass balance indicated a total inlet of 236,726 kg/h and a total outlet of 230,575 kg/h, resulting in a mass deficit of 6,151 kg/h attributed to dust formation and water evaporation. The measured on-size product yield was approximately 98.50% at the outlet, with the desired particle size range of 2–4.75 mm. These findings provide critical insights for process optimization and resource management in urea granulation, emphasizing the need for precise operational control to minimize material losses and ensure product quality compliance with specifications.
Transforming Tofu Waste into a Growth Medium: Boosting Biomass and Proximate Content of Microalgae Nita Ariestiana Putri; Resti Nurmala Dewi; Rizka Ayu Yuniar; Ranti Amanda Mauliasantri
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 4 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i4.4839

Abstract

This study explores the potential of tofu waste as a cost-effective alternative growth medium for cultivating Spirulina sp. and Nannochloropsis oculata, addressing the high costs of traditional nutrient media that limit large-scale applications. Despite the nutrient richness of tofu waste, its use as a sustainable growth substrate remains underexplored. This research aims to fill this gap by evaluating the growth performance and nutritional suitability of these microalgae in tofu-based media compared to standard controls. The cultivation process was conducted in a closed photobioreactor system, with harvesting methods including flocculation, centrifugation, and filtration. Results showed that tofu waste media supported biomass production comparable to standard cultivation media, with the highest biomass concentrations recorded at the 20% tofu waste treatment, yielding 0.23 ± 0.05 g L-1 for Spirulina sp. and 0.53 ± 0.2 g L-1 for Nannochloropsis oculata. At this concentration, the final COD levels were 840.84 mg L-1and 825.90 mg L-1, respectively. The lipid and protein contents were 2.44% and 1.71% for Spirulina sp., and 1.21% and 1.50% for Nannochloropsis oculata, respectively. These findings demonstrate that tofu waste can serve as an effective and low-cost growth substrate for Spirulina sp. and Nannochloropsis oculata, promoting circular economy principles within many sectors such as energy, food, and agriculture. This study underscores the potential of waste utilization to enhance the sustainability and economic viability of microalgae cultivation.
Advancing Fucoxanthin Production from Microalgae: A Bibliometric Analysis of Research Trends and Innovations Muhamad Maulana Azimatun Nur; Resti Nurmala Dewi; Faizah Hadi; Tunjung Wahyu Widayati; Danang Jaya; Nita Ariestiana Putri; Siti Fauziah; Alinda Fitrotun Nisya
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 2 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.6377

Abstract

Fucoxanthin has attracted significant public attention due to its extensive bioactive properties, including antioxidant, anti-inflammatory, and anti-obesity effects. This study conducts a bibliometric analysis to assess research trends, key contributors, and scientific progress in fucoxanthin studies. By utilizing data from prominent scientific databases, various bibliometric indicators, such as publication output, citation patterns, and collaborative networks, were analyzed. The analysis reveals a consistent rise in research publications over the past two decades, with significant contributions from countries like Germany, Japan, and China. Additionally, the study identifies leading institutions and influential authors who have significantly impacted the field. The results highlight the expanding interest in fucoxanthin's potential applications in pharmaceuticals, functional foods, and nutraceuticals. Furthermore, the study sheds light on collaborative efforts between academic institutions and industries that drive innovation and commercialization. This comprehensive evaluation not only provides an understanding of the current research landscape but also identifies future directions for scientific exploration and technological advancements. The findings serve as a valuable resource for researchers, policymakers, and industry stakeholders to make informed decisions and foster innovation in the utilization of fucoxanthin for human health and sustainability.
Co-Authors Alinda Fitrotun Nisya Danang Jaya Faizah Hadi Hariyadi, Asful Jefri Pandu Hidayat Muhamad Maulana Azimatun Nur Muhammad Azi Kusuma Ranti Amanda Mauliasantri Resti Nurmala Dewi Rizka Ayu Yuniar Siti Fauziah Tunjung Wahyu Widayati