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ERWAN ADI SAPUTRO
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International Journal of Eco-Innovation in Science and Engineering (IJEISE)
Published by Universitas Pembangunan Nasional Veteran Jawa Timur
ISSN : -     EISSN : 27218775     DOI : https://doi.org/10.33005/ijeise
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Industrial & Manufacturing Engineering Mechanical Engineering
International Journal of Eco-Innovation in Science and Engineering (IJEISE) covers all topics of Eco-Innovation in Science and technology related research from Chemical Engineering, Environment Engineering, Civil engineering, Industrial Engineering, Food Technology, Agrotechnology and others science and engineering field. IJEISE publish 2x a year (May and November).
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 104 Documents
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Potential Application of Microwave-assisted Methods for Metal Extraction from Fly Ash: Review Tasya Alya Azzahiro; Nita Ayu Setia Ningsi; Susilowati; Renova Panjaitan
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 7 No. 01 (2026): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v7i01.203

Abstract

Fly ash is a solid waste product resulting from the combustion of coal or biomass that contains various valuable metals such as Si, Al, Fe, Ca, and Mg. The utilization of fly ash as a source of secondary metals is considered important from both economic and environmental perspectives. Various extraction methods have been applied, including conventional acid leaching, biogenic leaching, alkali leaching, and hydrometallurgy; however, each has limitations regarding efficiency and environmental impact. This study examines the application of a microwave-assisted extraction method that utilizes rapid and uniform heating to enhance the metal dissolution process. Comparative results from various sources indicate that extraction via the microwave method yields higher metal recovery than other methods, such as conventional hydrometallurgical, biogenic, and pyrometallurgical approaches, particularly for aluminium compounds, with recoveries of around 95-96%. The advantages of this method are associated with lower solvent consumption, shorter processing times, higher energy efficiency, and greater environmental friendliness. Thus, the microwave-assisted method is the most effective and efficient technique for metal extraction from fly ash, regardless of the need for further research on industrial-scale applications.
Synthesis of Ca–Si–K–P Composite from Carbide Lime and Rice Husk using Precipitation Method Reyhan Firmansyah; Ayu Fakhira Yuliananda; Srie Muljani; Luluk Edahwati
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 7 No. 01 (2026): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v7i01.215

Abstract

The development of compositionally multinutrient composite offers a promising pathway to overcome the limitations of conventional fertilizer systems that predominantly focus on N–P–K. In this study, a Ca–Si–K–P composite was synthesized via a controlled precipitation route utilizing carbide lime waste and rice husk ash as sustainable precursors. The effects of precipitation pH (7–11) and calcination temperature (600–1000 °C) on oxide composition and yield were systematically investigated. The results demonstrate that increasing pH from 7 to 11 significantly enhances CaO content, reaching its optimum at pH 9–11, while SiO₂ content decreases by up to ~20–30% under highly alkaline conditions due to increased silicate solubility. The K₂O fraction remains relatively low (<10 wt%) across all conditions, primarily due to dissolution losses and thermal volatilization, whereas P₂O₅ exhibits minor variation (<5 wt%) within the studied pH range. Increasing calcination temperature from 600 to 1000 °C leads to a relative increase in SiO₂ content by approximately 10–15%, accompanied by a decrease in CaO fraction and partial loss of K₂O and P₂O₅ at temperatures ≥900 °C. The product yield exceeds 100% due to KOH addition during pH adjustment and shows a decreasing trend with temperature, dropping by approximately 10–20% from 600 to 1000 °C as a result of dehydration and decarbonation processes. Overall, alkaline precipitation conditions (pH 9–11) combined with moderate calcination temperatures (700–800 °C) provide the most favorable balance between compositional homogeneity and yield. These findings highlight the potential of waste-derived resources and precipitation engineering in producing composition controlled Ca–Si–K–P composites, offering significant prospects for application as advanced multinutrient fertilizer precursors.
Biohydrogen Production from Organic Waste by Fermentation : A Review Ainin Ainiyah; Rio Maulana Putra Istiawan; Mohammad Norazmi Ahmad; Ardika Nurmawati
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 7 No. 01 (2026): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v7i01.216

Abstract

Biohydrogen production from organic waste represents a promising renewable energy alternative that can contribute to reducing dependence on fossil fuels. Biohydrogen is an environmentally friendly energy carrier, as it produces no carbon emissions during utilization and possesses a high energy content. Fermentation-based processes have been extensively studied due to their ability to operate without light, under relatively mild temperature and pressure conditions, and to utilize a wide variety of organic wastes as substrates. The present review article deals with the production of biohydrogen from organic waste by different fermentation methods, emphasizing the characteristics of the feedstock and the effect of the operating parameters on the efficiency of the process. The literature review demonstrated that dark fermentation is a promising sustainable route for biohydrogen production. But the relatively low hydrogen yields and the need for strict operating conditions mean that further optimization is needed to apply this technology effectively on an industrial scale, particularly in terms of improving the yield efficiency and reducing operational expenses. This study seeks to identify and compare the operating conditions reported in the literature that correlate with higher biohydrogen yield.
Effect of Washed Process Fermentation on Specialty Coffee Flavor Ridwan Rizkyanto; Bastian Nova; Linda Wati; Padriasyah Lubis
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 7 No. 01 (2026): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v7i01.218

Abstract

Specialty coffee represents a high-value agricultural commodity whose overall quality is profoundly influenced by post-harvest processing parameters, with fermentation constituting a critical determinant in the development of its distinctive sensory profile. Among various processing techniques, the washed process, characterized by controlled wet fermentation has been widely recognized for its capacity to generate unique and refined flavor attributes. The present study sought to investigate the influence of differential fermentation durations within the washed process framework on the sensory characteristics of Arabica specialty coffee. A sensory evaluation was conducted using the standardized cupping test in accordance with Specialty Coffee Association (SCA) protocols, employing trained panelists to assess multiple flavor dimensions. Analytical observations indicated discernible variations in sensory attributes as a function of fermentation duration, thereby reinforcing the necessity of stringent quality control measures with particular emphasis on fermentation management. These insights highlight the pivotal role of optimizing fermentation time in enhancing flavor complexity while mitigating the emergence of undesirable off-flavors. It is further recommended that subsequent research endeavors explore the targeted application of defined microbial starters in conjunction with the systematic optimization of fermentation parameters, in order to advance both the consistency and the sensory excellence of specialty coffee production.

Page 11 of 11 | Total Record : 104

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