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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Eksergi: Chemical Engineering Journal JISI UMJ (Jurnal Integrasi Sistem Industri UMJ) Journal of Engineering and Technological Sciences JURNAL NASIONAL TEKNIK ELEKTRO R.E.M (Rekyasa Energi Manufaktur) Jurnal Indonesian Journal of Chemistry REACTOR : Journal of Research On Chemistry And Engineering Journal of Applied Agricultural Science and Technology Journal of Industrial Community Empowerment JURNAL REKAYASA KIMIA & LINGKUNGAN
Reni Desmiarti
Bung Hatta University
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Penerapan Teknologi Peningkatan Daya Tahan Buah Naga Menjadi Minuman Serbuk Ramayani, Devi; Putra, Ikhsan Syafano; Raihan, Mohammad; Susanti, Riju; Rambe, Rodo Padena; Desmiarti, Reni; Sari, Ellyta
Journal of Industrial Community Empowerment Vol 3, No 2 (2024): Published in October 2024
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/jice.v3i2.317

Abstract

Dragon fruit (Hylocereus spp.) is a tropical fruit that is rich in antioxidants such as vitamin C, polyphenols, flavonoids and betacyanins which have positive effects on human health. However, fresh dragon fruit has a short shelf life and can be damaged during storage and distribution. The aim of tecnology application is to increase the shelf life of dragon fruit by processing it into a powdered drink using the caramelization method. Caramelization is a heating technique that can improve the taste, stability and extend the shelf life of the product without reducing its nutritional value. In this project dragon fruit was heated until it caramelized, producing a more complex taste and aroma. After the caramelization process, the dragon fruit is dried and air-dried to produce powder. This process successfully improves the quality of the product, with a richer natural sweet taste. This project confirms that the caramelization method is effective in extending the shelf life of dragon fruit and maintaining its quality. The resulting dragon fruit powder drink provides an innovative solution in the storage and distribution of dragon fruit. This discovery opens up opportunities for the development of more efficient and healthier functional foods.
Synthesis of Aragonite from Precipitated Calcium Carbonate: A Pilot Scale Study Sari, Ellyta; Desmiarti, Reni; Zulhadjri, Zulhadjri; Alif, Matlal Fajri; Rosadi, Maulana Yusup; Arief, Syukri
Indonesian Journal of Chemistry Vol 24, No 6 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.92169

Abstract

The CO2 mineralization pathway is considered a promising option for carbon capture usage and storage because the captured CO2 can be permanently stored, and secondly industrial waste (i.e., petrochemical refinery, lime, and cement kiln dust) can be recycled into value-added carbonate materials by controlling the crystal polymorphs and properties of mineral carbonate. This study investigated the CO2 mineralization utilized for the synthesis of precipitated calcium carbonate (PCC) via low temperatures at 30 °C and 55 °C with the addition of 50 and 75 g/L of ammonium chloride (NH4Cl). The pilot scale of PCC production was established to simultaneously produce PCC with low energy demand by reporting the feasibility of economic analysis and to develop the mineral carbonation that can transform limestones and CO2, which was captured from the petrochemical refinery process into economically valuable PCC. It is found that the aragonite phase of PCC can be generated at a room temperature of 30 °C by adjusting the CO2 flow rate. In addition, the use of NH4Cl, which transformed into ammonium carbonate ((NH4)2CO3) during the calcination process, can maintain the stable aragonite phase by varying the NH4Cl concentration.
Desulfurisasi Batubara Dengan Metode Leaching Menggunakan Gel Lidah Buaya Wahyuni, Alfia; Tanjung, Diva Amanda; Hapsauqi, Iqbal; Desmiarti, Reni; Desfitri, Erda Rahmilaila
REACTOR: Journal of Research on Chemistry and Engineering Vol 5, No 2: December 2024
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v5i2.136

Abstract

Coal is still the world's main energy source, widely used in power generation, steel production materials, cement industry, alumina processing plant paper factories and other chemical industries. Burning coal with high sulfur content produces sulfur dioxide gas (SO2), which can directly or indirectly disrupt the environment and contribute to air pollution and the formation of acid rain. Therefore, desulfurization has become an interesting research topic to improve coal quality. In this research, coal desulfurization is carried out using aloe vera gel as a solvent. 300 ml of aloe vera gel was contacted with 50 grams of coal using a magnetic stirrer with varying stirring speeds of 500 and 750 rpm, for duration 2, 3, 5 and 7 hours. Then, separated, dried, and analyzed for sulfur content, ash content, and calorific value. The results showed that the sulfur content decreased by 19.11% to 24.61%, the ash content decreased by 8.51% to 12.56%, and the calorific value was obtained respectively 6439cal/g, 6381 cal/g, 6433 cal/g, and 6467 cal/g.
Optimization of Steam Methane Reforming Process Through Addition of Hydrogen Gas to Hydrogen Plant in Oleochemical Industry: Optimasi Proses Steam Methane Reforming Melalui Penambahan Gas Hidrogen pada Hydrogen Plant di Industri Oleokimia Desfitri, Erda Rahmilaila; Ansyah, Zulfebri; mardian; Desmiarti, Reni
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i1.1742

Abstract

Steam Methane Reforming (SMR) merupakan teknologi produksi hidrogen yang beroperasi pada suhu 750-900°C menggunakan katalis berbasis nikel dengan sifat sangat endotermik. Penelitian ini mengkaji pengaruh penambahan hidrogen pada umpan sebagai alternatif optimasi proses di PT Ecogreen Oleochemicals Batam, merespons perubahan komposisi gas alam dari 86% menjadi 82% metana dan peningkatan etana-propana. Perubahan ini menyebabkan ketidakstabilan proses dan pembentukan karbon yang berlebih, mengakibatkan deaktivasi katalis ketika peningkatan rasio steam-to-carbon tidak memungkinkan karena keterbatasan operasional. Hasil penelitian menunjukkan korelasi antara suhu reformer, konsumsi bahan bakar NG, dan yield produk. Penambahan hidrogen terbukti efektif mencegah pembentukan karbon dan mempertahankan stabilitas proses. Studi ini memberikan solusi praktis untuk optimasi produksi hidrogen melalui keseimbangan penambahan hidrogen, suhu reformer, dan efisiensi bahan bakar.
Optimization of Gambier Industry Wastewater Treatment Plant (WWTP) Performance: a Systematic Approach for Environmental Sustainability Desfitri, Erda Rahmilaila; Desmiarti, Reni; Permata, Adinda Ratu; Elizarni, Elizarni
Journal of Applied Agricultural Science and Technology Vol. 8 No. 2 (2024): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jaast.v8i2.253

Abstract

The gambier industry in West Sumatra, particularly in Payakumbuh, is Indonesia's largest producer of gambier, contributing approximately 80-90% of the national production. This high production rate results in increased waste generated during the production process. This article discusses the potential environmental pollution from wastewater from the gambier industry and efforts to address this issue. The study notes that coagulation-flocculation and adsorption methods have efficiently treated textile industry wastewater. The study discusses the Wastewater Treatment Plant (WWTP) conditions in the gambier processing industry before optimization and the steps taken to improve its performance. Additionally, the study analyzes wastewater characteristics before and after treatment. The results of this study indicate that adding aerators and pH-adjusting agents to the WWTP can improve wastewater treatment performance, resulting in effluent that meets the quality standards set by government regulations. Moreover, treating wastewater with adding Poly Aluminium Chloride (PAC) reduces COD and BOD, indicating the degradation of organic components in gambier waste. COD removal efficiency is 92.65%, and BOD removal efficiency is 58.01%. This optimization results in an improved quality of gambier industry wastewater, reducing its negative environmental impact. These efforts are crucial to meet environmental regulatory standards established by the Indonesian government.
Advanced Applications of Pozzolan-Derived Silica: Hydrophobic Agent Synthesis Desfitri, Erda Rahmilaila; Mustikaningtias, Endah; Rizaldi, Fajri Akbar; Sari, Ellyta; Desmiarti, Reni
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.43525

Abstract

The Sumatera Barat province of Indonesia, particularly Padang Pariaman Regency, is rich in pozzolan, a natural resource characterized by high silica (SiO) and alumina (AlO) content. Despite its abundance, pozzolan remains underutilized, primarily used in conventional applications such as cement substitutes and brick production. This study investigates the extraction, purification, and application of pozzolan-derived silica for advanced industrial uses, focusing on synthesising hydrophobic materials. Silica was extracted from pozzolan using alkali and acid treatments, achieving a high-purity cristobalite phase with 93.86% SiO content based on the X-ray diffraction (XRD) and X-ray fluorescence) XRF analysis. The cristobalite phase was combined with polydimethylsiloxane (PDMS) to develop a hydrophobic agent. Hydrophobic performance was evaluated using water contact angle (WCA) measurements, with two coating methodsswab coating and dip-coatingemployed to test the materials. Results revealed that the cristobalite phase achieved the highest hydrophobicity when applied via dip-coating, reaching a WCA 114. Fourier Transform Infrared (FT-IR) analysed the characteristics of a hydrophobic compound. Furthermore, varying PDMS concentrations influenced hydrophobic performance, with 0.4 grams of PDMS yielding the optimal WCA of 105.31 before diminishing returns were observed at higher concentrations due to aggregation effects. This research demonstrates the viability of pozzolan-derived silica as a sustainable and cost-effective raw material for hydrophobic agent synthesis. The findings highlight its potential applications in advanced industries, including water-repellent coatings, glass, ceramics, and catalysts. By advancing the utilization of natural pozzolan resources, this study contributes to sustainable material development and aligns with global efforts to enhance resource efficiency and innovation.
Penerapan Teknologi Peningkatan Daya Tahan Buah Naga Menjadi Minuman Serbuk Ramayani, Devi; Putra, Ikhsan Syafano; Raihan, Mohammad; Susanti, Riju; Rambe, Rodo Padena; Desmiarti, Reni; Sari, Ellyta
JICE : Journal of Industrial Community Empowerment Vol. 3 No. 2 (2024)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Dragon fruit (Hylocereus spp.) is a tropical fruit that is rich in antioxidants such as vitamin C, polyphenols, flavonoids and betacyanins which have positive effects on human health. However, fresh dragon fruit has a short shelf life and can be damaged during storage and distribution. The aim of tecnology application is to increase the shelf life of dragon fruit by processing it into a powdered drink using the caramelization method. Caramelization is a heating technique that can improve the taste, stability and extend the shelf life of the product without reducing its nutritional value. In this project dragon fruit was heated until it caramelized, producing a more complex taste and aroma. After the caramelization process, the dragon fruit is dried and air-dried to produce powder. This process successfully improves the quality of the product, with a richer natural sweet taste. This project confirms that the caramelization method is effective in extending the shelf life of dragon fruit and maintaining its quality. The resulting dragon fruit powder drink provides an innovative solution in the storage and distribution of dragon fruit. This discovery opens up opportunities for the development of more efficient and healthier functional foods.
Co-Authors . Darwison Amelia Amanda Amelia Amir Ansyah, Zulfebri Ariadi Hazmi Arifanda, Aditya Yoga Ayu Bidiawati JR Desfitri, Erda Rahmilaila Edwardo Edwardo Eka Putra Waldi Elizarni Elizarni, Elizarni Ellyta Sari Ellyta Sari Erda Desfitri Erda Rahmilaila Desfitri Erti Praputri Firdaus Firdaus Fu-Sheng Li Fu-Sheng Li Fusheng Li Fusheng Li Fusheng Li Fusheng Li Gui, Hongjie Hapsauqi, Iqbal Hongjie Gui Inva Salsabil Lestari Setiawati Li, Fusheng Li, Fusheng mardian Matlal Fajri Alif Maulana Rosadi Muhammad Imran Hamid Mustikaningtias, Endah Naldi, Nofri Nofri Naldi Nora Idiawati Paysmi, Paysmi Permata, Adinda Ratu Primas Emeraldi Putra, Ikhsan Syafano Raihan, Mohammad Ramayani, Devi Rambe, Rodo Padena Rizaldi, Fajri Akbar Rosadi, Maulana Yusup Sandy Yuda Verdana Suherman, Hendra Susanti, Riju Syukri Arief Tanjung, Diva Amanda Toshiro Yamada Wahyuni, Alfia Wei, Yongfen Yamada, Toshiro Yesmizarti Muchtiar Yongfen Wei Yulastri . Yulianti, Amro Zulhadjri Zulhadjri