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All Journal Jurnal Rekayasa Hijau Equilibrium Journal of Chemical Engineering Advance Sustainable Science, Engineering and Technology (ASSET)
Teodora Maria Fernandes Brito Da silva
Universitas 17 Agustus 1945 Semarang
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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Reduction Of Dissolved Ammonia with the Stripper Method in pH and Temperature Variations Ery Fatarina; Priyono Kusumo; Teodora Maria Fernandes Brito Da silva; Much Yusuf Firdaus
Advance Sustainable Science Engineering and Technology Vol 5, No 1 (2023): November-April
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v5i1.15111

Abstract

Condensate Polishing System (CPS) regeneration waste from PT. Bhimasena Power Indonesia has an ammonia level of 932 mg N/L. Therefore, research on reducing dissolved ammonia waste is very important. Research gaps in reducing dissolved ammonia waste include the effects of time variations and dissolved ammonia concentrations, the effect of water quality, and the impact of using methods on the environment. The purpose of this study was to determine the effect of variations in pH and temperature on the effectiveness of separating ammonia waste and to obtain optimum pH and temperature values for the separation of dissolved ammonia waste. The method used in this experiment is the stripper method. The results showed that the process of reducing dissolved ammonia using the stripper method reached an optimum value at a temperature of 45 °C and pH 12. Under these conditions, a reduction value of 0.75 mg N/L was obtained. So it can be concluded that the stripper method can reduce dissolved ammonia waste properly. The impact of this research can develop a more effective and environmentally friendly waste treatment method
Performance and Pressure Drop Study on Shell and Tube and Double Pipe Heat Exchangers Teodora Maria Fernandes Brito Da Silva
Equilibrium Journal of Chemical Engineering Vol 10, No 1 (2026): Volume 10, No 1 July 2026 (First Online)
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v10i1.111008

Abstract

This study aims to analyze the performance and pressure drop of shell-and-tube and double-pipe heat exchangers. Tests were conducted using water as the hot and cold fluid. The flow rate variations used were 0.8 GPM, 1.0 GPM, and 1.2 GPM. The main parameters analyzed were the pressure drop values on the shell and tube sides for the shell-and-tube type and on the inner and outer pipes for the double-pipe type. The results showed that increasing the flow rate caused an increase in pressure drop in both types of heat exchangers. In the shell-and-tube type, the highest pressure drop was 0.017 psi at a flow rate of 1.2 GPM, while in the double-pipe type, it was 0.0101 psi at the same flow rate. These values are still far below the maximum allowable limit of 10 psi, so both devices are still feasible to operate. The relationship between the parameters (DG/μ)av and (ΔP)av shows an increasing trend with increasing fluid mass rate, indicating that viscosity and flow velocity affect pressure loss along the heat exchanger.
Evaluation of Pseudo-First-Order Kinetics of Starch Acid Hydrolysis in Red Rice and White Rice Teodora Maria Fernandes Brito Da Silva; Kholifatul Nisa; Puspita Anggraeni; Nurur Rifky Wibowo; Diyah Puspita Sari
Rekayasa Hijau : Jurnal Teknologi Ramah Lingkungan Vol 10, No 2 (2026)
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/jrh.v10i2.143-153

Abstract

AbstrakPenelitian ini bertujuan untuk mengevaluasi kesesuaian model kinetika pseudo-ordo satu pada proses hidrolisis asam pati beras merah dan beras putih serta menentukan konstanta laju reaksi berdasarkan data konversi yang diperoleh. Proses hidrolisis dilakukan secara batch menggunakan 10 gram substrat basis kering dengan penambahan HCl 37% pada kondisi isotermal selama 50 menit. Kadar gula reduksi hasil hidrolisis dianalisis menggunakan metode Fehling dan digunakan untuk menghitung konversi reaksi. Parameter kinetika ditentukan melalui hubungan ln(1−X) terhadap waktu reaksi. Hasil penelitian menunjukkan bahwa konversi pati beras merah meningkat dari 12,85% menjadi 16,85%, sedangkan beras putih meningkat dari 31,05% menjadi 93,17% selama 50 menit. Analisis regresi menunjukkan hubungan linier yang kuat dengan nilai R² masing-masing sebesar 0,9682 dan 0,9926. Konstanta laju reaksi diperoleh sebesar 0,00093 menit⁻¹ dan 0,0445 menit⁻¹. Secara umum, perbedaan laju reaksi dipengaruhi struktur pati. Kajian kinetika ini dapat menjadi dasar optimasi proses hidrolisis biomassa menuju teknologi yang lebih berkelanjutan dan efisien energi.Kata kunci: Hidrolisis Asam, Kinetika Pseudo-Ordo Satu, Pati beras, Biomassa Terbarukan, Rekayasa Hijau  AbstractThis study aims to evaluate the suitability of the pseudo-first-order kinetic model in the acid hydrolysis process of brown rice and white rice starch and determine the reaction rate constant based on the conversion data obtained. The hydrolysis process was carried out in batches using 10 grams of dry base substrate with the addition of 37% HCl under isothermal conditions for 50 minutes. The reducing sugar content of the hydrolysis results was analyzed using the Fehling method and used to calculate the reaction conversion. Kinetic parameters were determined through the relationship of ln(1−X) to reaction time. The results showed that the conversion of brown rice starch increased from 12.85% to 16.85%, while that of white rice increased from 31.05% to 93.17% over 50 minutes. Regression analysis showed a strong linear relationship with R² values of 0.9682 and 0.9926, respectively. The reaction rate constants were obtained at 0.00093 min⁻¹ and 0.0445 min⁻¹. In general, differences in reaction rates are influenced by starch structure. This kinetic study can provide a basis for optimizing biomass hydrolysis processes toward more sustainable and energy-efficient technologies.Keywords: Acid Hydrolysis, Pseudo-First-Order Kinetics, Rice Starch, Renewable Biomass, Green Engineering
Co-Authors Diyah Puspita Sari Ery Fatarina Purwaningtyas Kholifatul Nisa Much Yusuf Firdaus Nurur Rifky Wibowo Priyono Kusumo Puspita Anggraeni