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Istiqomah Rahmawati
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istiqomah.rahmawati@unej.ac.id
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+6285649555784
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jobc@unej.ac.id
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Jl. Kalimantan no 37 – Kampus tegal boto Jember Jawa Timur 68121, INDONESIA
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Journal of Biobased Chemicals (JOBC)
Published by Universitas Jember
ISSN : 27463257     EISSN : 27462544     DOI : https://doi.org/10.19184/jobc.v2i1.116
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
The scopes of this journal include the following topics: 1. Components extract from bioresources 2. Chemical and physical processing of biomass 3. Biobased materials and composites 4. Biobased energy production 5. Catalyst technology for biomass conversion 6. Biological processing of bioresources, chemicals and waste 7. Treatment of biobased chemical waste 8. Application of the biobased chemical products to the target users 9. System analysis, management, and environmental protection of biobased chemical processing This journal does not consider the topics about organic chemicals from non-organism, crops and breeding, organism modification, metabolic engineering, bioresources and environmental management which do not relate to biobased chemical processing.
Arjuna Subject : Teknik Kimia (semua kategori) - Bioengineering
Articles 92 Documents
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Kinetics Study of Ultrasound-assisted Hydrodistillation on Lemongrass (Cymbopogon citratus) leaves Essential Oil Production Nurmawati, Ardika; Novita Indahyani; Luky Natasha; Pujiastuti, Yunita Ali
Journal of Biobased Chemicals Vol. 6 No. 1 (2026): Journal of Biobased Chemicals
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v6i1.60005

Abstract

Mechanisms in the essential oil production process continue to develop. Ultrasonic-assisted hydrodistillation (UAHD) is a highly efficient technique for essential oil production that reduces extraction time and increases essential oil yield through cavitation. However, kinetic modeling is required to understand the mass-transfer mechanism and facilitate process scaling. This study aimed to evaluate the extraction kinetics of essential oil from lemongrass (Cymbopogon citratus) leaves using the UAHD method and to identify the most suitable kinetic models among pseudo-first-order (PFO) and pseudo-second-order (PSO) equations in both linear and nonlinear forms. Experimental yield data were collected from the UAHD process, in which the ultrasonic procedure was performed at 40 °C for 10 minutes, followed by hydrodistillation at 100 °C for 30–150 minutes. The yield data were fitted into four kinetic models and assessed using statistical error analysis. The extraction process exhibited a two-phase profile (rapid initial washing and a slow diffusion phase). All models provided a reasonable fit, while the non-linear PSO model demonstrated the highest accuracy and the lowest error values. The non-linear PSO model predicted the equilibrium yield (qt) to be 14.0224 g, and the rate constant (k2) was 0.0049 kg g-1 min-1.
Utilization of Fly Ash as a Coagulant in the Coagulation Process of Coal Yard Wastewater Fajri Wan Hidayat; Ramadhani, Arnesya; Ichya Musytafizur Ziqri; Siti Khuzaimah
Journal of Biobased Chemicals Vol. 6 No. 1 (2026): Journal of Biobased Chemicals
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v6i1.60006

Abstract

Coal yard wastewater is an industrial effluent characterized by high turbidity, high total suspended solids (TSS), and acidic pH, which may cause environmental pollution if discharged without proper treatment. One commonly applied treatment method is coagulation; however, the use of conventional chemical coagulants may increase operational costs and sludge generation. This study aims to evaluate the use of fly ash as an alternative coagulant for treating coal yard wastewater. Fly ash was activated using sulfuric acid (H2SO4) at concentrations of 1%, 3%, 5%, 7%, 10%, and 15%. The coagulation process was conducted using coagulant dosages of 2 mL and 4 mL per 500 mL of wastewater. The analyzed parameters included pH, turbidity, and total suspended solids (TSS). The results showed that activated fly ash significantly reduced turbidity and TSS by up to approximately 80%. The optimum performance was achieved at fly ash activation concentrations of 5% and 7%. These results indicate that fly ash has strong potential as an effective, economical, and environmentally friendly alternative coagulant for coal yard wastewater treatment.

Page 10 of 10 | Total Record : 92

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