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Iwan Ridwan
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Jl. Gegerkalong Hilir, Ds. Ciwaruga Kecamatan Parongpong Kabupaten Bandung Barat Kotak Pos Bandung 1234 Kode Pos 40559 Gedung Jurusan Teknik Kimia
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FLUIDA
Published by Politeknik Negeri Bandung
ISSN : 14128543     EISSN : 27237680     DOI : https://doi.org/10.35313/fluida
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Materials Science & Nanotechnology
FLUIDA (FLD, ISSN: 1412-8543, e-ISSN: 2723-7680) is a science and technology journal that contains articles taken from laboratory research results, simulation results of problems, conceptual analysis (the study of problem-solving in writing) about the production process, troubleshooting, and maintenance as well as results of studies/evaluations of the performance of a system process, especially in the fields of Chemical Engineering, Sustainable and Renewable Energy, Bioprocess Technology, and Food Technology.
Arjuna Subject : Teknik Kimia (semua kategori) - Teknik Kimia (Lain-Lain)
Articles 5 Documents
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Search results for , issue "vol. 18 no. 2 (2025): fluida" : 5 Documents clear
The Effect of Ginger Extract Concentration and Fermentation Time on the Decaffeination Process of Green Bean Robusta Coffee Tri Hariyadi; Nurul Azka Saptajani; Shafira Nurul Aulia Zahra; Dhyna Analyes Trirahayu
Fluida Vol. 18 No. 2 (2025): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v18i2.6551

Abstract

Decaffeination was performed using a fermentation method employing ginger crude extract containing the proteolytic enzyme zingibain. This study aimed to evaluate the effect of ginger crude enzyme concentration and fermentation time on the reduction of caffeine content in robusta coffee. Fermentation was conducted using ginger crude enzyme concentrations of 40, 50, 60, 70, 80, and 90% (v/v) and fermentation times of 6, 12, 18, 24, and 30 h. The optimum condition for caffeine reduction was obtained at 90% (v/v) ginger crude enzyme concentration and 30 h of fermentation. Organoleptic properties were evaluated by 30 untrained panelists. The results showed that ginger crude enzyme significantly affected the aroma, taste, and aftertaste of robusta coffee. This study demonstrates the potential of ginger crude enzyme fermentation as a natural alternative method for coffee decaffeination.
Sintesis dan Karakterisasi SiO2@C dari Sekam Padi Sebagai Anoda Baterai Litium: - Joko Suryadi; Eko Andrijanto; Mentik Hulupi; Shafira Salsabilla; Hani Hanifah
Fluida Vol. 18 No. 2 (2025): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v18i2.6560

Abstract

The rapid development of technology systems today has triggered a demand for battery development as energy storage. Utilizing the abundant biomass in Indonesia can meet commercial demands, one of which is rice husk. Rice husk is the protective layer that encases rice grains, containing holocellulose (55%), lignin (20%), SiO2 (20%), and minerals (5%), and has the potential to be used as a precursor for silica and carbon to create SiO2@C nanocomposites. In this study, SiO2@C composites were synthesized as lithium battery anode materials from rice husk using a calcination method and the addition of NaOH to form a porous morphology. The calcination process was carried out at 800℃ for 1 hour with a mass ratio of SP-C (Rice Husk Carbonization) and NaOH (1:1, 1:2, and 1:3). The synthesized SiO2@C composites exhibited a porous morphology within the mesopore size range of 13,94 nm at a 1:1 ratio and contained Si 2,42%, O 9,72%, and 87,86%. The mass ratio of NaOH addition can influence the surface area of the SiO2@C composites, with yields of 392,00 m2/g for 1:1 ratio, 1023,04 m2/g for the 1:2 ratio, and 1756,63 m2/g for the 1:3 ratio.
The Effectiveness of AKD as Internal Sizing and Surface Sizing on Improving Barrier Properties of Medium Paper Mochammad Iqbal Fardiansyah; Nurul Ajeng Susilo; Edwin K. Sijabat; Erwin Erwin; Gilang Garnadi Suryadi
Fluida Vol. 18 No. 2 (2025): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v18i2.6276

Abstract

Recycled fiber is an alternative raw material that can be produced into new paper called medium paper. Medium paper has important parameters that need to be considered when making process, one of which is cobb size. Based on data processed at the factory, cobb size instability occurs and tends to increase beyond the standards set by the factory. An increase in the cobb size parameter occurs due to a lack of optimal sizing, causing a decrease in the paper's ability to hold air and can reduce the dimensional stability and surface quality of the paper. Improving the quality of the paper produced is necessary. In this research, chemical sizing agents were added such as AKD (Alkyl Ketene Dimer) which aims to determine the effect of adding AKD to recycled raw materials with variations in the right dose when injected as internal sizing and surface sizing to reduce cobb size value. By using a dose of Alkyl Ketene Dimer (0 kg/ton, 0.5 kg/ton, 1 kg/ton) as internal sizing and surface sizing and the effect of AKD curing time-2 days. At the best dose, the cobb size value was obtained, namely 62 gr/m² and there was an increase in the quality of Cobb size paper compared to existing by 30%. This shows that longer curing time results in a more hydrophobic surface and lower water absorption, indicating an improvement in the paper water resistance.
SINTESIS LI-NMC MELALUI METODE SOLID STATE MENGGUNAKAN MHP DAN NISO4 SEBAGAI VARIASI SUMBER NIKEL Haryadi; Iwan Ridwan; Muhammad Salman Alfarisi; Rizky Yanuar Haz
Fluida Vol. 18 No. 2 (2025): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v18i2.6557

Abstract

Li-NMC-based cathodes are widely developed for next-generation batteries due to their high electrochemical performance and energy density. This study focuses on synthesizing Li-NMC type NMC811 using two nickel sources Mixed Hydroxide Precipitate (MHP) and nickel sulphate (NiSO4) through the solid state method. The process involved calcination at 500°C for 5 hours and sintering at 700oC, 800oC, and 900oC for 12 hours. The aim was to analyze the effect of temperature and nickel source on the crystallinity and crystal size of Li-NMC. X-Ray Diffraction (XRD) revealed that low crystallinity was observed at 700oC due to broad and weak diffraction peaks. Sintering at 800oC improved the structure and showed the presence of a Li0.88Mn2O4 phase. At 900oC, samples showed sharp peaks and high intensity, indicating excellent crystallinity. Crystal size analysis using the Debye-Scherrer equation showed that NiSO4 samples reached 41.98 nm at 800oC, while MHP samples achieved 71.69 nm at 900oC both exceeding the commercial size of 29.56 nm. These results suggest that 800-900oC is optimal for Li-NMC synthesis, and MHP is a promising alternative nickel source.
Reduction of COD and Color from Non-Destructive Testing Wastewater Using Persulfate-Based AOPs Method Bambang Soeswanto; Endang Kusumawati; Luthfi Alfaridzi Setiawan; Muhammad Rizal Firjatulloh
Fluida Vol. 18 No. 2 (2025): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v18i2.6593

Abstract

PT Collins Aerospace is an aerospace component electroplating company that utilizes Non-Destructive Testing (NDT) in its production process, generating liquid waste containing fluorescent dyes—toxic, persistent, and complex organic compounds with a light green color. The initial Chemical Oxygen Demand (COD) of the wastewater is 2880 mg/L. To treat this, the Advanced Oxidation Processes (AOPs) method was selected for its ability to degrade complex organics into simpler, non-toxic substances like H₂O and CO₂. This study evaluates the impact of persulfate dosage, heating duration, and operating pH on the reduction of COD and color intensity. The parameters tested include persulfate dosages (100, 300, 500 ppm), heating durations (30, 60, 120 minutes), operating pH levels (4, 6, 9), and temperatures (room temperature and 65°C). Results show that the optimal persulfate dosage was 500 ppm, achieving 77.78% COD reduction and 52.5% color removal. The best heating duration was 120 minutes with 88.33% COD reduction and 58.79% color removal, while pH 6 yielded the highest efficiency, with 88.89% COD reduction and 76.13% color removal, resulting in a clear visual appearance. In contrast, treatment at room temperature showed decreased performance, with 61% COD reduction.

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