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All Journal JURNAL TEKNOLOGI LINGKUNGAN Rekayasa Mesin World Chemical Engineering Journal JURNAL INTEGRASI PROSES Teknika: Jurnal Sains dan Teknologi Prosiding Semnastek Jurnal Ilmiah Wahana Pendidikan Jurnal Teknologi Lingkungan Jurnal Pengabdian Dinamika Journal of Systems Engineering and Management JURNAL REKAYASA KIMIA & LINGKUNGAN
Rahmayetty Rahmayetty
Jurusan Teknik Kimia, Fakultas Teknik, Universitas Sultan Ageng Tirtayasa
Religion Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences Other

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PENENTUAN JENIS OKSIDATOR DAN JUMLAH SIKLUS PROSES TERBAIK PADA TAHAP PRETREATMENT PENGOLAHAN LIMBAH CAIR OXAMYL Gallan Kusuma; Endarto Yudo Wardhono; Rahmayetty Rahmayetty
JURNAL INTEGRASI PROSES VOLUME 11 NOMOR 1 JUNI 2022
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jip.v11i1.14734

Abstract

Penggunaan oxamyl sebagai bahan aktif dalam pembuatan produk pestisida menghasilkan produk samping yang digolongkan sebagai limbah bahan berbahaya dan beracun serta non biodegradasi dengan nilai chemical oxygen demand (COD) yang tinggi. Saat ini, proses pengolahan limbah oxamyl masih menggunakan metode konvesional dengan biaya proses yang cukup tinggi. Teknologi yang efektif dan efisien untuk mengolah limbah dari golongan karbamasi adalah teknologi advance oxydation processes (AOP). Metode ini mengkombinasikan beberapa reaksi yaitu, ozonisasi dengan gelombang ultra violet (UV) serta oksidator kuat peroksida dan persulfat untuk menghasilkan radikal bebas OH-. Tujuan dari penelitian ini adalah mendapatkan jenis oksidator dan jumlah siklus proses terbaik terhadap laju degradasi COD dan %Oxamyl. Pengolahan limbah oxamyl menggunakan 3 oksidator yaitu peroksida, persulfat, dan campuran peroksid & persulfat. Dosis oksidator yang digunakan adalah 5000 ppm. Hasil terbaik dari tahap ini dialirkan oleh pompa untuk disirkulasi di rangkaian alat AOP dengan jumlah siklus proses yaitu 20, 40, 60, 80, 100, 120, 140, dan 160. Pada penelitian ini, oksidator terbaik adalah campuran antara peroksida dan persulfat dalam rentang waktu 48 jam dengan nilai COD dan kandungan oxamyl masing-masing sebesar 4254,63 ppm, 0,31% dan 43173,21 ppm 1,9%.
Review: Performance Analysis Of Bioelectrochemical System For Domestic Wastewater Treatment In Student Center Building Campus E University Of Sultan Ageng Tirtayasa Hatifah Bahrum; Fatah Sulaiman; Rahmayetti Rahmayetti
Jurnal Ilmiah Wahana Pendidikan Vol 8 No 18 (2022): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (139.059 KB) | DOI: 10.5281/zenodo.7138543

Abstract

Bioelectrochemical systems (BES) are an umbrella term for a family of technologies that have evolved from traditional electrochemical systems and in which the electrodic processes are related, either directly or indirectly, to the metabolic activity of particular microorganisms. Despite the fact that BES have not yet reached the commercial scale, these technologies show significant promise because they enable for the valorization of various liquid and gas waste streams. The potential of BES in waste management and valorization is investigated in this chapter. To be more precise, it examines the pragmatics of utilizing BES for energy valorization of wastewaters and CO rich streams. Here, BES is demonstrated to be competitive with standard wastewater treatment methods in terms of energy usage by making use of the energy content of certain compounds found in wastewater. Furthermore, it investigates the potential for BES to allow wastewater treatment plants to be used as a load regulation mechanism for electrical grids. Some of the ways in which BES can help the energy-intensive fertilizers business save money include explaining how it can be used to extract fertilizers from trash. The most important examples of scaling up from the field are discussed as a final section. Performance Analysis, Bio-electrochemical System, Domestic Wastewater Treatment
EKSTRAKSI KITIN DARI JAMUR TIRAM MENGGUNAKAN REAKTOR MICROWAVE Nufus Kanani; Wardalia Wardalia; Widya Ernayati; Endarto Yudo Wardhono; Rahmayetty Rahmayetty; Muhammad Triyogo Adiwibowo; Tazkia Nuraviari Adeliana; Bimo Martino
JURNAL INTEGRASI PROSES Vol 11, No 2 (2022)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jip.v11i2.15687

Abstract

Kitin adalah homopolimer yang tersusun dari N-acetyl d-glucosamine dan glucosamine yang terikat dengan β 1–4 glycosidic. Kitin umumnya diperoleh dari ekstraksi kulit udang melalui proses deproteinasi dan demineralisasi dengan tahapan proses yang lama dan panjang. Pada penelitian ini dilakukan isolasi kitin dari jamur tiram sebagai alternatif sumber bahan baku dengan bantuan reaktor microwave. Proses ekstraksi dilakukan pada variasi waktu antara 5-60 menit untuk memperoleh kadar protein yang optimum. Selanjutnya dilakukan variasi temperatur antara 50-80°C untuk memperoleh kadar kitin. Hasil perolehan kadar protein tertinggi didapatkan pada waktu reaksi selama 60 menit yaitu 99,91% dan kadar kitin tertinggi diperoleh pada temperatur 80°C dengan kadar kitin yang didapatkan sebesar 7,10%.
Effect of maleic anhydride compatibilizer addition on mechanical properties of polylactic acid (PLA)/cellulose acetate (CA) composites film Abdul Kholiq; Ika Jumantika; Achmad Syarafuddin As-syirazi; Rahmayetty Rahmayetty
Jurnal Teknika Vol 18, No 2 (2022): Available Online in November 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.17306

Abstract

Environmental problems caused by the use of undegradable conventional plastics are still the major issue. According to the Badan Pusat Statistik (BPS) in 2021, plastic waste in Indonesia accumulated as much as 66 million tons per year and is expected to raise gradually. PLA and CA, derived from renewable resources, are biodegradable, thermoplastic, resistant to pressure, and are often used as raw materials for the manufacture of composite plastics. PLA is hydrophobic and CA is hydrophilic, so a compatibilizer is needed as a substance that can improve the mechanical properties, compatibility, and homogeneity of the resulting composite film. This research aims to obtain the ratio of PLA/CA and the concentration of maleic anhydride (MA) compatibilizer to produce PLA/CA composites film with good mechanical strength and according to packaging material standards. The method in this research is solvent casting by synthesizing composite films through sample preparation, modification of CA with MA, grafting of PLA/CA and MA, synthesis of composite films of PLA/CA and MA, as well as several characteristic tests. The results showed that the obtained films were identified as having PLA, CA, and MA, had a relatively smooth surface and were degraded at a temperature treatment of 543oC. The best film was obtained from mass variations of PLA/CA and MA (6:4:1.5 gram) with a tensile strength of 7.38 MPa, and elongation at break reached 18.11% and met the packaging standard values by Japanese Industrial Standard (JIS).
OBSERVASI PENURUNAN TEKANAN (PRESSURE DROP) PADA SISTEM PERPIPAAN: PENGARUH PANJANG DAN DIAMETER PIPA, ELBOW, DAN TEE Nuryoto, Nuryoto; Rahmayetty, Rahmayetty; Yusuf Rumbino; Astrilia Damayanti; Doni Rahmat Wicakso
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1666

Abstract

The piping system is a fundamental process equipment in the industry. The phenomena that occur in piping systems vary depending on the conditions of the pipes and the fluids flowing through them. Therefore, research related to piping systems requires attention to minimize and understand the occurring phenomena. There have been many studies related to piping analysis, but what sets this research apart from previous studies is that it focuses on examining the contribution of each component of the piping system to friction loss-pressure drop. Furthermore, the data obtained is used to determine the deviation or difference between experimental data and theoretical calculations. This research aims to study the correlation between friction loss and pressure drop in piping systems (including pipes, elbows, and tees) and to determine the extent of deviation between theoretical calculations and actual conditions, as well as to understand the trend of such deviations. Results show that as the length of the pipe increases, there is an increase in pressure drop, especially for pipe lengths of 0.6, 0.8, and 1.4 meters, the values are 275.26, 367.0, and 642.27 Pa over density, respectively. Conversely, as the pipe diameter increases, the resulting pressure drop becomes smaller, namely for pipe diameters of 0.5, 0.75, and 1.25 inches, the values are 266.64, 93.33, and 13.33 Pa over density, respectively. In the observation of the influence of fittings, it is shown that the pressure drop generated by elbows is greater than that of tees, with values of 26.66 and 13.33 Pa over density, respectively. When calculating the percentage deviation, there is a tendency for longer pipes and larger diameters will increase the percentage of deviation. For pipe lengths of 0.4, 0.6, and 1.4 meters, the percentage deviations are 3.23, 10.11, and 17.50%, respectively. For variations in pipe diameter, the percentage deviations are 3.23, 41.74, and 47.15% for diameters of 0.5, 0.75, and 1.25 inches, respectively. Meanwhile, the percentage deviation for tees is greater than that of elbows, with values of 84.78% (for elbows) and 185.02% (for tees).
Perancangan sistem informasi manajemen penanganan sampah berbasis circular economy secara digital di Kota Cilegon Bahauddin, Achmad; Abdullah, Muhammad Hasyim; Kurniawan, Bobby; Fuad, Anis; Trenggonowati, Dyah L.; Rahmayetty, Rahmayetty; Suhendi, Endang
Journal of Systems Engineering and Management Vol 1, No 1 (2022)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/joseam.v1i1.17601

Abstract

Sampah merupakan hasil sisa dari produk yang tidak dapat digunakan kembali. Sampah memiliki ancaman bagi lingkungan apabila tidak diolah dengan baik. Banyak cara untuk menangani permasalahan sampah. Salah satu bentuk dari penanganan sampah adalah penanganan berbasis circular economy dengan bank sampah menjadi wadah masyarakat untuk memilah sampah. Sampah yang ditabung oleh nasabah akan memiliki nilai ekonomi bagi nasabah berupa saldo tabungan. Bank sampah dapat mengolah sampah yang telah dikumpulkan menjadi produk yang dapat digunakan kembali. Kota Cilegon memiliki bank sampah di berbagai lokasi. Cara penanganan sampah dengan sistem pendataan yang masih dilakukan secara manual dan pertukaran informasi secara tatap muka belum memiliki manajemen yang efektif dan efisien. Perancangan sistem informasi secara digital dengan platform android dapat mempermudah manajemen pendataan sampah dan nasabah dalam bank sampah. Tujuan dari makalah ini sebagai bentuk dokumentasi secara komprehensif tahapan dalam perancangan sistem informasi manajemen penanganan sampah berbasis circular economy secara digital menggunakan platform android. Aplikasi android yang dikembangkan menggunakan konsep System Development Life Cycle. Tahapan yang dilakukan yaitu perancanaan sistem, analisis sistem, perancangan sistem, implementasi sistem dan pengujian sistem. Penggunaan model DFD, ERD, use case diagram dan activity diagram dalam perancangan sistem maka dapat dibuatnya aplikasi android dengan nama Bank Sandi. Aplikasi Bank Sandi dilakukan pengujian sistem menggunakan metode Skala Kebolehgunaan Aplikasi Mudah Ahli (SKAMA) dengan skor sebesar 85,75. Aplikasi Bank Sandi memiliki usability yang baik karena memiliki nilai rata-rata skor usability diatas skor 68.
Application of Edible Film based on Chitosan-PLA in the Prolongation of the Shelf Life of Longan Fruit Kanani, Nufus; Rahmayetty, Rahmayetty; Wardhono, Endarto Yudho; Wardalia, Wardalia
World Chemical Engineering Journal VOLUME 4 NO. 2 DECEMBER 2020
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v4i2.10596

Abstract

Longan fruit (Dimacorpus longan lour) is one of non-climacteric tropical fruit. Longan fruit has a short shelf life under room temperature. Pericarp browning and microbial decay are the majir factors reducing the longan shelf life, it can cause the limitation of consuming the longan fruits. An alternative means without toxic and pollution effect for preventing and controlling the the post harvesting fruits are needed such as blend film and edible coating application. Application of edible coating is promising to improve the quality and extend live of post harvested vegetable and fruits. Therefore the aim of this study is to define the potential of Chitosan-PLA (Ch-PLA) composites to extend the shelf life of longan fruits. In this experiment, we investigated those with the effect of PLA content to the chitosan film on water vapour permeability, pH condition, film thickness and weight loss of longan fruits.
EFFECT OF THE ADDITION OF ORANGE PEEL POWDER ON THE PHYSICAL AND MECHANICAL PROPERTIES OF POLYLACTIC ACID (PLA)/CELLULOSE ACETATE (CA) FILM COMPOSITES Achmad Syarafuddin As-syirazi; Geraldi Riantoro; Farhan Alif Syahjaya; Rahmayetty Rahmayetty; Nuryoto Nuryoto
Jurnal Rekayasa Kimia & Lingkungan Vol 18, No 2 (2023): Jurnal Rekayasa Kimia & Lingkungan (December, 2023 )
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v18i2.34178

Abstract

Conventional plastics are already a popular packaging material in society, but they have a harmful influence on the environment. As a result, there is a need for environmentally friendly polymers that are raw from nature and biodegradable alternatives to traditional plastics, one of which is raw plastic Polylactic Acid (PLA) coupled with Cellulose Acetate (CA) and Tween 80 as a compatibilizer. The goal of this research was to find the best ratio of orange skin powder to PLA/CA with the compatibilizer Tween 80 to improve the physical, mechanical, and antibacterial properties of the composite film. The method used is solvent casting with a mass ratio of PLA/CA 6: 4 with the addition of Tween 80 2%, and the addition of orange peel powder with variations of 2, 4, 6, and 10 % w/w to the weight of PLA. The tests carried out include FTIR, SEM, XRD, DSC-TGA, mechanical tests (tensile strength and elongation at break), swelling tests, and antibacterial tests. The results showed that the PLA/CA/Tween 80 film composite has a fairly smooth surface with a small cavity, capable of degrading to a temperature of 546.57C. Regarding the mechanics, the best film composites were identified at a variation of 6% with tensile strength of 4.05 MPa and elongation at break reaching 11.2% with a fairly small water absorption and this variation did not show antibacterial activity.
Synthesis of Lactic Acid from Molasses by Lactobacillus acidophilus Using a Batch Fermentation Process Rahmayetty Rahmayetty; Meri Yulvianti; Rudi Hartono
Jurnal Rekayasa Kimia & Lingkungan Vol 17, No 2 (2022): Jurnal Rekayasa Kimia & Lingkungan (December, 2022)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v17i2.25657

Abstract

Lactic acid is a chemical with widespread applications, mainly in pharmaceutical, cosmetic, chemical as well as food industries. One of the major uses of lactic acid is the polylactic acid (PLA) feedstock which is biodegradable and biocompatible as an alternative to plastic derived from fossil fuels. Efforts continue to be made to reduce the cost of producing PLA in order to compete with the conventional petrochemical-based plastics. This include the use of molasses as a raw material because it is cheap and contains high glucose. The purpose of this study was to obtain cell concentrations through the addition of starter volume that produces high concentrations of lactic acid and to obtain the growth kinetics of Lactobacillus acidophilus during the fermentation process. This study was conducted in several stages; the design of bioreactors, inoculation of Lactobacillus acidophilus, and fermentation of molasses. In a batch system, molasses substrate was directly inserted as much as 500 ml in the fermentor and the addition of starter volume of Lactobacillus acidophilus was 1; 3; 5 dan 10% v/v. The fermentation of molasses for 72 hours and the product was analysed every 8 hours. The highest concentration of lactic acid produced in batch fermented molasses was added to 5% (v/v) starter volume with 72 hours of fermentation time, which was 23.1 mg/L, with value the carrying-capacity coefficient (k) and the maximum net specific growth rate (net) were 0.2379 h-1 and 0.0160 h-1 respectively.
HIDROPONIK GUNA MENINGKATKAN KETERAMPILAN DAN MEWUJUDKAN KETAHANAN PANGAN SANTRI PONDOK PESANTREN AN-NUR DI KECAMATAN WALANTAKA, PROVINSI BANTEN Kanani, Nufus; Wardalia, Wardalia; Y Wardhono, Endarto; Rahmayetty, Rahmayetty
Jurnal Pengabdian Dinamika Vol 9, No 2 (2022)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/dinamika.v9i2.17856

Abstract

Pondok pesantren merupakan suatu lembaga pendidikan Islam tertua yang ada di Indonesia dandipimpin langsung oleh kyai atau ulama. Banten memiliki 33.000 pondok pesantren yang tersebardi wilayah pedesaan maupun perkotaan dan merupakan Propinsi yang memiliki jumlah pondokpesantren terbanyak di Indonesia salah satunya adalah Pondok pesantren An-Nur yang terletak diKampung Jaha, Kec. Walantaka, Propinsi Banten. Pada saat ini, kegiatan pembelajaran yangdilakukan dipondok pesantren ini menggunkaan kurikulum akademik islamiah, namun masih minimdalam keterampilan baiksoft skillmaupunhard skill.Pengabdian ini berfokus pada peningkatansoft skilldanhard skillpara santri serta mewujudkan kemandirian pangan dilingkungan pondokpesantren melalui budidaya sayur secara hidroponik. Metode yang digunakan pada kegiatan iniadalah ceramah, diskusi, dan praktik langsung cara budidaya sayur secara hidroponik. Hasil darikegiatan ini menunjukkan adanya peningkatan keterampilan para santri untuk melakukan budidayasayur secara hidroponik, selain itu juga melalui kegiatan ini dapat mewujudkan ketahanan pangankhususnya bagi para satri di Pondok Pesantren An-Nur.
Co-Authors Abdul Kholiq Abdullah, Muhammad Hasyim Achmad Bahauddin Achmad Syarafuddin As-syirazi Anis Fuad Anton Irawan Aryudi Reza Astrilia Damayanti Bambang Prasetya Bimo Martino Bobby Kurniawan D. R. Barleany Dede Fathurrahman Doni Rahmat Wicakso Dyah L. Trenggonowati Endang Suhendi, Endang Endarto Yudo Wardhono Farhan Alif Syahjaya Fatah Sulaiman Gallan Kusuma Geraldi Riantoro Gustiana Awaludin Sobarsah Hakiki, Muhammad Hatifah Bahrum Ika Jumantika Indar Kustiningsih Intan Fauziah Jayanudin Kanani, Nufus Makiyi, Muhammad Meri Yulvianti Misri Gozan Muhammad Triyogo Adiwibowo Nadia Kartika Sari Nufus Kanani Nufus Kanani Nufus Kanani, Nufus Nurul Ukhdiya Nuryoto Putri Shaufika Nazmi Rudi Hartono Sri Utami Sukirno Sukirno Tazkia Nuraviari Adeliana Teguh Kurniawan Vivi Anggraeni Wahyu Saptahadi Wardalia Wardalia Wardalia Wardalia, Wardalia Wardhono, Endarto Yudho Widya Ernayati Y Wardhono, Endarto Yusuf Rumbino