Article Per Year (5 Year)
p-Index From 2020 - 2025
2.125
P-Index
This Author published in this journals
All Journal Jurnal Teknik ITS Eksergi: Chemical Engineering Journal Seminar Nasional Teknik Kimia Kejuangan Jurnal Pembelajaran Pemberdayaan Masyarakat (JP2M) Jurnal Pengabdian Kepada Masyarakat Patikala Aptekmas : Jurnal Pengabdian Kepada Masyarakat Formosa Journal of Applied Sciences (FJAS) Dharma: Jurnal Pengabdian Masyarakat
Nyamiati, Retno Dwi
Department Of Chemical Engineering, Faculty Of Industrial Engineering, Yogyakarta Veteran National Development University
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Veterinary Other

Published : 15 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 15 Documents
Search

 1   2 
Pra-Desain Pabrik Pembuatan Natrium Karbonat (Soda Abu) Dengan Menggunakan Proses Solvay Retno Dwi Nyamiati; Arnesya Ramadhani; Siti Nurkhamdah; Yeni Rahmawati
Jurnal Teknik ITS Vol 8, No 1 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (404.841 KB) | DOI: 10.12962/j23373539.v8i1.39038

Abstract

Berkembangnya ilmu dan teknologi menuntut bangsa Indonesia untuk mengembangkan sektor industri, salah satunya adalah pabrik bahan kimia. Kebutuhan akan bahan-bahan kimia di dalam negeri perlu ditingkatkan untuk menuju kemandirian di bidang industri kimia. Natrium karbonat (Na2CO3) atau yang biasa dikenal dengan Soda Ash merupakan salah satu komoditi ekspor atau impor terbesar di dunia. Dalam tahun 2005, kapasitas total produksi Na2CO3 di dunia sekitar 48 juta metric ton. Produsen Na2CO3 yang paling besar adalah kawasan Asia Timur yaitu China dan kawasan Amerika Utara yaitu USA & Meksiko. Terdapat beberapa proses pembuatan natrium karbonat, yaitu proses secara alami dan secara sintesis. Proses terpilih yaitu dengan menggunakan proses solvay dimana terdapat empat tahapan proses dalam pembuatan natrium karbonat (soda abu) yaitu brine purification, lime section, ammonia absorption dan carbonation column serta calcination section. Pabrik natrium karbonat ini akan didirikan di Arosbaya, Bangkalan Madura, Jawa Timur dengan estimasi waktu mulai produksi pada tahun 2021. Berdasarkan Analisa ekonomi untuk kapasitas 185.000 ton/tahun, laju pengembalian modal (IRR) pabrik ini sebesar 22,3 % pada suku bunga per-tahun 12 % dan laju inflasi sebesa 4,36 %. Sedangkan untuk waktu pengembalian modal (POT) adalah 4,511 tahundan titik impas (BEP) sebesar 20,3 %.
Kinetic and Thermodynamic Studies in Cellulose Acetate-Polybutylene Succinate(CA-PBS)/Single Solvent/Water System for Desalination Membrane Retno Dwi Nyamiati; Siti Nurkhamidah; Yeni Rahmawati; Wahyu Meka
Eksergi Vol 20, No 1 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i1.8820

Abstract

The most important part of the membrane synthesis process so that it has the desired pores is the solidification process of the membrane, the process begins with a change from one liquid phase into two liquid phases (liquid-liquid demixing). At a certain period during demixing, the polymer-rich phase solidifies; thus, a dense membrane matrix is formed. Parameters that determine the mechanism of membrane formation are based on thermodynamics including phase separation of Solvent-Polymer-Non-solvent which is explained through a phase diagram (Flory-Huggins Theory). This study aims to determine the initial prediction of the formation of CA-PBS membranes with various solvents used and variations of non-solvents in the best system, which is proven by its characteristics and performance when applied to desalination membranes which include ternary diagrams using cloud point data, solubility parameters with Hansesn solubility, the solvent-non-solvent diffusivity using the Tyn Calus Equation approach and the morphological proofing of the membrane through SEM photos, and the performance of the resulting membrane through salt rejection and permeate flux. The results of the difference in solubility parameters are can be predicted that using DMF solvent on the CA-PBS membrane can reduce the pore size and eliminate voids and macrovoids in the membrane morphology.
Utilization of Fly Ash and Zeolite to Reduce Chemical Oxygen Demand (COD) in Domestic Waste at the Al Ihya Ulumaddin Islamic Boarding School Cilacap Arnesya Ramadhani; Sonya Hakim Raharjo; Retno Dwi Nyamiati
Formosa Journal of Applied Sciences Vol. 2 No. 3 (2023): March 2023
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjas.v2i3.3347

Abstract

Domestic waste is the result of waste from various human activities. An alternative to reduce domestic waste is waste filtration. The purpose of this study was to find the best time for the filtration process using fly ash and zeolite to reduce COD levels in the domestic waste of the Al-Ihya Islamic Boarding School. The filter media is composed of 5 layers, namely gravel, palm fiber, zeolite, sand and fly ash. This research stage is to find the best filtration time from variations of 0, 90, 150 and 210 minutes. The resulting filtrate was tested for color and COD levels. The results show the best filtration time is 90 minutes. The color of the waste was originally cloudy black after being filtered for 90 minutes, the color changed to clear yellow. The original COD level was 1,932 mg/L after going through a filtration process for 90 minutes, decreasing to 310 mg/L.
SOSIALISASI PENGOLAHAN AIR DENGAN “WATER MEMBRANE FILTRATION” DARI MATA AIR POLAMAN KEBUMEN Heri Septya Kusuma; Bambang Sugiarto; Suranto; Retno Dwi Nyamiati
Aptekmas Jurnal Pengabdian pada Masyarakat Vol 6 No 2 (2023): Aptekmas Volume 6 Nomor 2 2023
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36257/apts.v6i2.6814

Abstract

This community service aims to socialize water treatment technology from the Polaman spring in Polaman, Kebakalan Village, Karanggayam, Kebumen, Central Java, and further enhance the capabilities of UKM partners in processing water into packaged drinking water products and increasing the market value of the water. The Polaman spring is the main water source for the community in that area, but its water quality does not yet meet the safe standards for human consumption. This community service involves the implementation of water treatment technology in several stages. Firstly, an initial survey is conducted to understand the condition of the water source and the needs of the local community. Then, the appropriate water treatment method is chosen based on those conditions and needs. The applied method is filtration technology using microfiltration, ultrafiltration, nanofiltration, and reverse osmosis, complemented with UV radiation. Subsequently, water treatment is socialized by utilizing the filtration technology. Through this water treatment socialization, it is expected that the water quality from the Polaman spring can be improved and deemed safe for local consumption. Additionally, it is also expected to raise public awareness regarding the importance of safe water treatment and responsible water usage.
Evaluasi Nilai Difusifitas Pelarut dan Konstanta Kecepatan Ekstraksi pada Isolasi Piperin Lada Hitam Mega Mustikaningrum; Desty Arista; Retno Dwi Nyamiati; Dodi Eko Nanda
Eksergi Vol 20, No 2 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i2.8996

Abstract

Piperine is a type of bioactive compound that can be isolated from black pepper. Currently the utilization of piperine is dominated by the health sector. In this study, piperine was isolated using the Soxhlet method. The purpose of this research is to propose a mathematical model to determine the value of the diffusivity (DA) of piperine, the extraction rate constant (k) and the piperine isolation equilibrium constant for commercial designs. Based on the results obtained the value of DA was obtained at 0.1878 m2/minute, the value of k was obtained at 0.0012 m/minute and the value of K was obtained at 0.900. Extraction was carried out using 96% ethanol solvent with a ratio of 25:1 to black pepper samples using the soxhletation method of 5 circulations. The resulting piperine extract was 55.46 mol/liter
Penelitian Terkini tentang Pengembangan Pemisahan dan Penangkapan Karbon dengan Membran Berbahan Dasar Polimer: Tinjauan Kebaruan Retno Dwi Nyamiati; Siti Nurkhamidah; Dodi Eko Nanda; Daniel Timotius; Mahreni Mahreni; Dian Purnami Handayani; Dwi Amalia; Alfathony Krisnabudhi
Eksergi Vol 20, No 2 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i2.9096

Abstract

Separation and capture of carbon dioxide (CO2) has become a very hot topic of discussion recently. The increasing amount of carbon dioxide in the environment makes environmental pollution very significant. Membrane technology is one of the alternative carbon separation processes that are increasingly in demand, because membrane technology provides excellent advantages in terms of energy requirements used, capital investment invested, and ease of operating equipment compared to other processes. Many membrane constituent materials can be used to be the basic material for making membranes, including polymeric materials. This review discusses the various polymeric materials that can be used as basic materials for gas membranes in terms of plasticization, constituent components, flexibility, and mechanical strength. It also provides an understanding of alternatives to improve the properties of polymer-based membranes.
Effect of Chitosan-TiO2 Membrane Performance for the Degradation of Batik Waste with a Photocatalytic Hybrid System Nyamiati, Retno Dwi; Timotius, Daniel; Sri Rahmawati, Septi Sri; Carissavila, Calista; Amalia, Noor
Eksergi Vol 21, No 1 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i1.10734

Abstract

The treatment of industrial wastewater has gained significant attention in recent years due to its detrimental impact on the environment and public health. This study aims to explore the effectiveness of a photocatalytic hybrid system using a Chitosan-TiO2 membrane for the degradation of batik waste. The performance of the membrane was investigated through a series of experiments, evaluating its ability to remove organic pollutants and enhance the overall treatment efficiency. The morphology, as seen through SEM images, shows a rough surface that enhances photocatalytic efficiency by providing a larger surface area for reactions. The uniform distribution of TiO2 particles within the chitosan matrix is crucial for stable and efficient pollutant degradation during photocatalysis. Furthermore, Chitosan-TiO2 membranes offer a promising solution for batik wastewater treatment. They combine the benefits of chitosan's permeability and organic substance capture with TiO2's photocatalytic capabilities. This integration allows for efficient, one-step hybrid photocatalytic filtration, reducing the use of harmful chemicals and producing environmentally friendlier byproducts. Finally, AAS analysis demonstrated that the addition of TiO2 improved heavy metal degradation in batik waste, with optimal performance observed up to a 89.78% rejection rate, beyond which TiO2 agglomeration occurred.
PENGOLAHAN AIR MATA AIR MENJADI AIR MINUM YANG BERKELANJUTAN DARI MATA AIR POLAMAN KEBUMEN Sugiarto, Bambang; Kusuma, Heri Septya; Suranto, Suranto; Nyamiati, Retno Dwi
Dharma: Jurnal Pengabdian Masyarakat Vol 4, No 2 (2023): November
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/dlppm.v4i2.11255

Abstract

Tujuan dari pengabdian ini adalah untuk memberikan pengetahuan tentang teknologi pengolahan air dari mata air Polaman di Dusun Polaman, Desa Kebakalan, Karanggayam, Kebumen, Jawa Tengah, dengan tujuan meningkatkan kemampuan Mitra UKM dalam mengolah air menjadi produk air kemasan yang siap dikonsumsi, serta meningkatkan nilai jual air tersebut. Mata air Polaman merupakan sumber air utama bagi penduduk di daerah tersebut, tetapi kualitas airnya belum mencapai standar yang aman untuk dikonsumsi. Pengabdian ini melibatkan implementasi teknologi pengolahan air dalam beberapa tahap. Tahap pertama adalah melakukan survei awal untuk memahami kondisi sumber air dan kebutuhan masyarakat setempat. Kemudian, dipilih metode pengolahan air yang sesuai dengan kondisi dan kebutuhan tersebut, yaitu dengan memanfaatkan teknologi Dry Heat Sterilization with Combination Membrane UV. Tim pengabdian juga memberikan pelatihan, pendampingan, dan sosialisasi terkait pengolahan air dengan sistem membran seperti yang telah disebutkan sebelumnya. Dengan penerapan sosialisasi pengolahan air ini, diharapkan kualitas air dari mata air Polaman dapat ditingkatkan sehingga aman untuk dikonsumsi oleh penduduk setempat. Selain itu, diharapkan juga dapat meningkatkan kesadaran masyarakat akan pentingnya pengolahan air yang aman dan penggunaan air dengan baik.
Effect of Cycling and Washing in Fouling Level from Theaflavin Filtration on Ultrafiltration Membrane Nyamiati, Retno Dwi; Yulianto, Mohamad Endy; Nanda, Dodi Eko; Diwiyanto, Yusron Mahendra
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

Ultrafiltration membranes, characterized by their molecular weight cutoff ranging from 50 to 100 kDa, are extensively employed for the filtration of macromolecules including suspended solids, carbohydrates, proteins, and various other components. However, the prolonged usage of these membranes leads to a notable decline in their performance due to fouling. Membrane fouling entails the accumulation of filtered foulant media and the formation of deposits, adversely impacting the filtration efficiency. This study focuses on evaluating the impact of repeated filtration cycles on membrane fouling and investigates the effectiveness of membrane washing in restoring membrane performance. The ultrafiltration membrane was subjected to five consecutive repetition cycles using theaflavin as the filtration media. The observed flux exhibited a substantial decline of 87%, decreasing from an initial value of 0.0574 L/m2.hr to 0.0073 L/m2.hr. To mitigate fouling and enhance membrane performance, a thorough washing process was carried out. Following the washing procedure, the flux was found to increase to 0.034 L/m2.hr, indicating a significant improvement in the membrane's performance. These findings are further supported by the morphological analysis of the membrane using Scanning Electron Microscope (SEM) photographs, which reveal the distinct differences between the membrane's morphology before and after washing.
DIGITALISASI SISTEM KEUANGAN UMKM: PELATIHAN PRAKTIS PENCATATAN DAN PELAPORAN KEUANGAN DIGITAL UNTUK PELAKU USAHA SERAT AGEL DI DAERAH ISTIMEWA YOGYAKARTA Ridwan, Muhamad; Pradana, Musthofa Galih; Nyamiati, Retno Dwi; Pinastawa, I Wayan Rangga; Arifuddin, Nurul Afifah; Adrezo, Muhammad; Maulana, Nurhuda
Jurnal Pengabdian Kepada Masyarakat Patikala Vol. 4 No. 4 (2025): Jurnal PkM PATIKALA
Publisher : Education and Talent Development Center of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51574/patikala.v4i4.3043

Abstract

The digitalization of financial management has become an essential requirement for micro, small, and medium enterprises (MSMEs) to ensure their sustainability and growth in the modern economic landscape. Nevertheless, a significant proportion of MSME actors continue to encounter difficulties in systematically preparing financial statements and recording business transactions. This community engagement initiative was designed to enhance digital financial literacy among MSME artisans engaged in agel fiber crafts in the Sentolo area, Kulon Progo Regency, Special Region of Yogyakarta. The activity employed an interactive training method with a hands-on, practical approach, incorporating both the introduction and application of the SIAPIK platform, a digital tool aimed at facilitating transaction recording and the preparation of financial reports. The results of this activity demonstrate an improvement in participants' understanding of managing business finances through digital platforms. Additionally, participants also experienced an increase in motivation to implement technology-based financial recording. These findings also indicate their initial readiness to adopt digital transformation within their business environments.
Co-Authors A Hidayat Nurwahid Alfathony Krisnabudhi Arnesya Ramadhani Arstyanto, Dimas Bambang Sugiarto Bambang Sugiarto Budi, Ryan Setya Carissavila, Calista Daniel Timotius Desty Arista Dian Purnami Handayani Diwiyanto, Yusron Mahendra Dodi Eko Nanda Dwi Amalia Fadhli Suko Wiryanto Heri Septya Kusuma I Wayan Rangga Pinastawa Ika Wahyuning Widiarti Kusuma, Heri Septya Mahreni Mahreni Mega Mustikaningrum Mohamad Endy Y Yulianto Muhamad Ridwan Muhammad Adrezo Muhammad Redo Ramadhan Musthofa Galih Pradana Nabila Aulia Balqis Nanda, Dodi Eko Niqotaini, Zatin Noor Amalia Nurhuda Maulana Nurkhamidah, Siti Nurul Afifah Arifuddin Putri Restu Dewati Septi Sri Rahmawati Setyaningtyas, Wiji Asih Siti Nurkhamdah Sonya Hakim Raharjo Suranto Suranto Suranto Timotius, Daniel Wahyu Meka Yeni Rahmawati, Yeni