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All Journal CHEMICA Jurnal Teknik Kimia JURNAL NASIONAL TEKNIK ELEKTRO Jurnal Rekayasa Hijau REACTOR : Journal of Research On Chemistry And Engineering JURNAL REKAYASA KIMIA & LINGKUNGAN
Reni Desmiarti
Universitas Bung Hatta
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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Kombinasi Proses Filtrasi dan Ion Exchange Secara Kontinu pada Pembuatan Aquadm (Demineralized Water) Reni Desmiarti
CHEMICA: Jurnal Teknik Kimia Vol 4, No 1 (2017): Juni 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (615.399 KB) | DOI: 10.26555/chemica.v4i1.6730

Abstract

Demineralized water is water free of dissolved mineral. Combination of filtration and ion exchanger processes were studied to treat demineralized water. The source of raw water is from Mountain Talang in District Solok. The study was conducted to investigate the effect of the amount of resin cartridge to electric conductivity (EC), pH and total dissolved solid (TDS).  The flow rate was set at 50 ml/menit. The results showed that the number of resin cartridge 4 (2 anion and cation 2), the removal efficiency of EC and TDS achieved at 89.09% and 90.91%, respectively. As for the number of cartridges 6 (3 anions and cations 3), the removal efficiency of EC and TDS obtained at 95.45% and 96.36%, respectively.  In addition, the effect of flow rate was also studied using cartridges resin 6 (3 anions and cations 3). Demineralized water has met the quality standard with a value of 0 ppm TDS, EC 0 μS / cm, pH 7.5. This studies shown that the combination of filtration and ion exchange filtration process can use effectively to treat demineralized water with high quality standard.
Teknologi Sistem Plasma Radio –Frekuensi (RF) Untuk Menghilangkan Bakteri Escherichia Coli Pada Air Minum Dean Corio; Ariadi Hazmi; Reni Desmiarti
JURNAL NASIONAL TEKNIK ELEKTRO Vol 3 No 2: September 2014
Publisher : Jurusan Teknik Elektro Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1477.682 KB) | DOI: 10.25077/jnte.v3n2.78.2014

Abstract

Refill drinking water is a source of public drinking water in Indonesia, but the quality is not guaranteed. less optimal means of water treatment to remove pollutants in Drinking Water Refill (AMIU), especially for raw water containing total coliforms and fecal coliforms cause AMIU quality is uncontrolled. The use of radio frequency plasma technology on AMIU processing system can be used as a solution. Induced plasma system by radio frequency in water can form the active compound. The active compounds will react to microorganisms and causing microorganisms be reduced. In testing wastewater 35,000 MPN (100 %), with plasma frequency of 3,3 MHz, the bacteria can degrade to 6 % and with frequency of 3,7 MHz bacteria can degrade to 0,07 %. 23.000 MPN testing river water (100 %), with plasma frequency of 3,3 MHz setting can degrade the bacteria to 9 % and with 3,7 MHz frequency setting can degrade the bacteria to 6 %.Keyword : plasma, radio frequency, total coliform, fecal coliform AbstrakAir minum isi ulang merupakan salah satu sumber air minum masyarakat di Indonesia, namun kualitasnya tidak terjamin.  Kurang optimalnya alat pengolah air guna menghilangkan polutan produk pada Air Minum Isi Ulang (AMIU), terutama untuk air baku yang mengandung total coliforms maupun fecal coliforms menyebabkan kualitas AMIU tidak terkontrol dengan baik. Penggunaan teknologi plasma radio frekuensi pada sistem pengolahan AMIU bisa dijadikan solusi. Sistem plasma yang terinduksi melalui radio frekuensi pada air  dapat membentuk senyawa aktif. Senyawa aktif ini akan bereaksi terhadap mikroorganisme dan menyebabkan mikroorganisme mati. Pada pengujian air limbah 350.000 MPN (100 %), dengan frekuensi plasma 3,3 MHz dapat mendegradasi bakteri sampai 6 % dan dengan settingan frekuensi 3,7 MHz dapat mendegradasi bakteri hingga 0,07 %. Pada pengujian air sungai 23.000 MPN (100 %), dengan settingan frekuensi plasma 3,3 MHz dapat mendegradasi bakteri hingga 9 % dan dengan settingan frekuensi 3,7 MHz dapat mendegradasi bakteri hinggaa 6 %.Kata kunci : plasma, radio frekuensi, total coliform, fecal coliform.
Analisis dan Karakterisasi Potensi Pozzolan Sebagai Sumber Silika (SiO2) Untuk Meningkatkan Nilai Sumber Daya Lokal Erda Rahmilaila Desfitri; Reni Desmiarti; Munas Martynis; Suci Rahma Dhani
Rekayasa Hijau : Jurnal Teknologi Ramah Lingkungan Vol 6, No 2 (2022)
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/jrh.v6i2.96-105

Abstract

ABSTRAKKabupaten Padang Pariaman memiliki sumber daya pozzolan yang belum termanfaatkan secara optimal. Pozzolan adalah bahan yang mengandung senyawa silika dan alumina. Untuk pemanfaatan yang optimal dilakukan analisis dan karakterisasi potensi pozzolan sebagai sumber silika. Silika bisa dimanfaatkan untuk bahan baku utama diberbagai industri, seperti industri gelas, keramik, katalis, pertanian dan untuk pengolahan limbah. Untuk mengetahui potensi pozzolan sebagai sumber silika dilakukan analisis kualitatif dan kuantitaif menggunakan XRD dan XRF. Berdasarkan hasil analisis pola difraksi sinar-X dengan measurement program PANalitycal ditemukan senyawa SiO2 yang tertinggi teramati pada posisi 2θ sebesar 20o dan 26o. Sedangkan analisis XRF dilakukan untuk mendapatkan informasi jumlah elemen dan oksida logam yang terkandung pada pozzolan. Hasil analisi XRF menunjukkan bahwa kadar SiO2 yang terdapat pada pozzolan adalah sejumalh 62,56%. Senyawa lain yang ditemukan pada pozzolan diantaranya Al2O3, SiO2, P2O5, K2O, CaO dan Fe2O3. Hasil penelitian menunjukkan bahwa pozzolan sangat berpotensi untuk dijadikan sumber silika.ABSTRACTPadang Pariaman regency has pozzolanic resources that have not been utilized optimally. Pozzolan is a material containing silica and alumina. For optimal utilization, analysis and characterization of the potential of pozzolan as a source of silica have been done. Silica can be used as a raw material in several industries, for example, glass, ceramic, catalyst industry, farm, and waste treatment. Qualitative and quantitative analyses by XRD and XRF were carried out to investigate pozzolan as a source of silica. Based on x-ray diffraction pattern with measurement of PANalitycal program was found SiO2 compound on 2θ position, 20o dan 26odegree. XRF analysis is used to get information chemical composition of pozzolan. XRF analysis found silica composition is 62,56%. Other compounds also found in pozzolans such as Al2O3, SiO2, P2O5, K2O, CaO, and Fe2O3. The result shows that pozzolan in Padang Pariaman Regency has the potential as a source of silica.
Desulfurisasi Batubara Dengan Metode Leaching Menggunakan Gel Lidah Buaya Alfia Wahyuni; Diva Amanda Tanjung; Iqbal Hapsauqi; Reni Desmiarti; Erda Rahmilaila Desfitri
REACTOR: Journal of Research on Chemistry and Engineering Vol. 5 No. 2 (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.
Advanced Applications of Pozzolan-Derived Silica: Hydrophobic Agent Synthesis Erda Rahmilaila Desfitri; Endah Mustikaningtias; Fajri Akbar Rizaldi; Ellyta Sari; Reni Desmiarti
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.
Co-Authors Alfia Wahyuni Dean Corio Diva Amanda Tanjung Ellyta Sari Endah Mustikaningtias Erda Rahmilaila Desfitri Fajri Akbar Rizaldi Iqbal Hapsauqi Munas Martynis Nora Idiawati Suci Rahma Dhani