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All Journal Jurnal Rekayasa Proses Jurnal Ilmu Lingkungan Jurnal Teknik ITS IPTEK The Journal for Technology and Science Jurnal Sains dan Teknologi Bulletin of Chemical Reaction Engineering & Catalysis REKAYASA JMM (Jurnal Masyarakat Mandiri) CHEESA: Chemical Engineering Research Articles Jurnal Rekayasa Proses Jurnal Teknologi Jurnal Pengabdian Kepada Masyarakat MEMBANGUN NEGERI Jurnal Penelitian IPTEKS TheJournalish: Social and Government Distilat: Jurnal Teknologi Separasi Unri Conference Series: Community Engagement Journal of Biobased Chemicals (JOBC) Sewagati Jurnal Teknik Kimia dan Lingkungan Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Rekayasa Proses
Muharja, Maktum
Department Of Chemical Engineering, Faculty Of Engineering, Universitas Jember, Jalan Kalimantan 37, Jember 68121
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Subcritical Water Process for Reducing Sugar Production from Biomass: Optimization and Kinetics Maktum Muharja; Arief Widjaja; Rizki Fitria Darmayanti; Nur Fadhilah; Bramantyo Airlangga; Abdul Halim; Siska Nuri Fadilah; I Made Arimbawa
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 4 Year 2022 (December 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.4.16527.839-849

Abstract

The competitive reactions of lignocellulose hydrolysis and monosaccharide degradation in the subcritical water (SCW) hydrolysis of coconut husk were investigated to optimize the reducing sugar yield. Optimization analysis was performed by response surface methodology (RSM) and kinetics studies. Parameters of process optimization were varied at 130-170 °C for 15-45 min. The reducing sugars were measured using the Dinitro salicylic acid method. The sugar yield increased when the temperature increased from 130 °C to 170 °C. The highest reduction sugar yield of 4.946 g/L was obtained at 183.6 °C for 4.8 min and 23.4 liquid/solid ratio (LSR). Kinetics studies were carried out at temperature variations of 150, 170, and 190 °C and pressures of 60, 80, and 100 bar for 5 to 60 min. The yield of reducing sugar decreased with increasing temperature. The kinetic model 2B is the best method to explain the competitive reaction kinetics of coconut husk hydrolysis. This research is an innovation to increase the reducing sugar to make the process more commercially viable. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Optimization of Microwave-Assisted Alkali Pretreatment for Enhancement of Delignification Process of Cocoa Pod Husk Maktum Muharja; Rizki Fitria Darmayanti; Bekti Palupi; Istiqomah Rahmawati; Boy Arief Fachri; Felix Arie Setiawan; Helda Wika Amini; Meta Fitri Rizkiana; Atiqa Rahmawati; Ari Susanti; Ditta Kharisma Yolanda Putri
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 1 Year 2021 (March 2021)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.1.8872.31-43

Abstract

In this study, the optimization of microwave-assisted alkaline (MAA) pretreatment is performed to attain the optimal operating parameters for the delignification of cocoa pod husk (CPH). The MAA performance was examined by heating the CPH solid with different particle sizes (60–120 mesh) and NaOH solution with a different sample to a solvent (SS) ratio (0.02–0.05 g/L), for short irradiation time (1–4 min). Box-Behnken Design (BBD) was utilized to optimize the percentage of lignocellulose composition changes. The results show that by enlarging particle size, the content of lignin and cellulose decreased while hemicellulose increased. By prolong irradiation time, the content of lignin and hemicellulose decreased while cellulose elevated. On the other hand, increasing the SS ratio was not significant for hemicellulose content changes. From FTIR and SEM characterization, the MAA drove the removal of lignin and hemicellulose of CPH and increased cellulose slightly. Supported by kinetic study which conducted in this work, it was exhibited that MAA pretreatment technology is an effective delignification method of CPH which can tackle the bottleneck of its commercial biofuel production. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Pengaruh Intensitas Cahaya dan Nutrisi Terhadap Laju Pertumbuhan Ulva sp. Palupi, Bekti; Maharani, Regita Gustiayu Pramisti; Wardani, Salza Belila Kusuma; Rizkiana, Meta Fitri; Amini, Helda Wika; Fachri, Boy Arief; Rahmawati, Istiqomah; Muharja, Maktum; Indrayani, Lilin
Jurnal Teknologi Vol. 11 No. 2 (2024): Jurnal Teknologi
Publisher : Universitas Jayabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31479/jtek.v11i2.272

Abstract

Ulva sp. adalah genus makroalga hijau dengan diameter permukaan yang besar. Manfaat dari kapasitas fotosintesis yang tinggi pada Ulva sp. sebagai media penyerapan nutrisi seperti amonium, nitrat, dan fosfor dengan tingkat yang tinggi. Ulva sp. termasuk alga yang tumbuhnya berdasarkan musim, untuk itu diperlukan budidaya guna memenuhi kebutuhan. Penelitian ini bertujuan untuk mengetahui pengaruh intensitas cahaya dan jumlah nutrisi terhadap kadar klorofil total dan laju pertumbuhan spesifik Ulva sp. Variabel yang digunakan adalah intensitas cahaya sebesar 1000 sampai dengan 3000 Lux serta jumlah nutrisi yang digunakan yaitu 0,6 mg/L hingga 1,8 mg/L. Penelitian ini dilakukan dengan lama penyinaran selama 12 jam. Prosedur yang dilakukan berupa pemeliharaan Ulva sp. dengan wadah terkontrol dilanjutkan dengan pengujian kadar nitrogen total, pengujian kadar fosfat, pengujian kadar klorofil, dan laju pertumbuhan spesifik. Didapatkan nilai derajat keasaman atau pH pada wadah penelitian berkisar 6,5 – 8,5, suhu berada di antara 24 – 26°C, dan salinitas 35 – 37 ppt. Hasil analisis menghasilkan data yang baik jika ditinjau dari nilai p-value yang memiliki nilai kurang dari 0,05.   Keywords: aklimatisasi, Ulva sp., nutrisi, klorofil, laju pertumbuhan
Optimalisasi Pemanfaatan Abu Ampas Tebu Untuk Pembuatan Paving Block Muharja, Maktum; Helgananta Adirya Sabian; Mutiara Rengganis Nurul Putri Azhari
Journal of Biobased Chemicals Vol. 3 No. 2 (2023): Journal of Biobased Chemicals
Publisher : Program Studi Teknik Kimia Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v3i2.440

Abstract

Salah satu industri gula memproduksi abu ampas tebu dalam jumlah yang banyak. Abu ampas tebu pada industri gula tersebut belum dapat dimanfaatkan. Abu ampas tebu memiliki kandungan silika yang cukup tinggi yakni sebesar 68,5% dapat dimanfaatkan sebagai bahan pengganti untuk mengurangi penggunaan semen pada pembuatan paving block. Pada penelitian ini pembuatan batu bata beton menggunakan metode pressing manual. Paving block terbuat dari pasir, semen, abu ampas tebu, abu batu dan air. Perbandingan semen, abu batu dan pasir menggunakan perbandingan 1:2:6 dengan variasi abu ampas tebu 10, 20 dan 30%. Hasil pengujian didapatkan batu bata beton mutu tertinggi pada pengeringan hari ke-7 dengan 214 kg/cm2 mendapatkan mutu B berdasarkan SNI 03-0691-1996 dan kuat tekan batu bata beton yang dihasilkan akan semakin meningkat seiring bertambahnya waktu pengeringan. Inovasi ini dapat meningkatkan kegunaan pada abu ampas tebu dan menjadi peluang bisnis baru untuk industri gula.
Development of a Novel Support Modification for Efficient Lipase Immobilization: Preparation, Characterization, and Application for Bio-flavor Production Moentamaria, Dwina; Irfin, Zakijah; Chumaidi, Achmad; Widjaja, Arief; Widjaja, Tri; Muharja, Maktum; Darmayanti, Rizki Fitria
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 2 Year 2024 (August 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20130

Abstract

The low cost and excellent catalytic properties of lipase for industrial processes are highly desirable. A promising new approach involves the support modification of lipase and spacer arm, which enables the enhancement of lipase properties. This study investigates the immobilization of crude lipase from Mucor miehei onto a Polyurethane Foam (PUF) surface using various coating techniques. The PUF matrix was obtained through isocyanate and polyol reactions. Subsequently, the PUF was coated by adsorbing lipase and adding edible support material. The immobilized lipase was then utilized in the hydrolysis of coconut oil to produce fatty acids. Furthermore, the immobilized enzyme was employed in the esterification of fatty acids to produce bio-flavors. The results demonstrate that the attachment reaction using support material, namely lecithin, gelatin, MgCl2, and Polyethylene glycol 6000 (PEG), all of which are simple and edible, was able to enhance the stability and reusability of lipase. This immobilization technique increased triglyceride hydrolysis into FFA by 422%. The successful edible support modification of immobilized lipase from M. miehei on PUF, coupled with significantly enhanced enzyme stability and catalytic activity, offers a promising, environmentally friendly solution for diverse applications in the food industry. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
EVALUASI PENGERINGAN RODENTISIDA MENGGUNAKAN METODE UDARA KERING DENGAN BANTUAN INSTRUMEN KIPAS ANGIN Arshy, David Permana; Nugroho, Imam Wahyu Beny; Muharja, Maktum; Khotimah, Husnul; Salsabila, Putri Ayu
DISTILAT: Jurnal Teknologi Separasi Vol. 10 No. 3 (2024): September 2024
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/distilat.v10i3.4089

Abstract

Tikus sawah (Rattus argentiventer) menjadi hama utama pada tanaman padi yang menyebabkan kerusakan dan kehilangan hasil panen, sehingga dibutuhkan pengendalian untuk mengatasi tikus yaitu rodentisida. Tingginya populasi tikus mengakibatkan meningkatnya kebutuhan rodentisida, namun terdapat permasalahan pada proses pengeringan yang membutuhkan waktu selama 20 jam. Penelitian ini bertujuan untuk mengevaluasi proses pengeringan rodentisida dengan bantuan instrumen kipas angin menggunakan variabel waktu pengeringan 1 jam, 2 jam, 3 jam, 4 jam, dan 5 jam. Metode percobaan yang digunakan adalah metode pengeringan udara kering dengan bantuan kipas angin. Parameter yang diuji adalah parameter kadar air, fisik, dan kemurnian bahan aktif rodentisida. Hasil percobaan menunjukkan bahwa semakin lama waktu pengipasan mengakibatkan terjadinya kenaikan kadar air setelah 3 jam dan semakin lama waktu pengipasan membuat tekstur rodentisida semakin keras dan kering. Berdasarkan penelitian ini didapatkan bahwa kondisi paling optimum adalah pada waktu selama 3 jam dengan kondisi fisik yang sempurna dan kadar air yang rendah.
Enhancement of the Quality of Onion Drying Using Tray Dryer Fadilah, Siska Nuri; Khamil, Achri Isnan; Muharja, Maktum; Darmayanti, Rizki Fitria; Aswie, Viqhi
CHEESA: Chemical Engineering Research Articles Vol. 5 No. 2 (2022)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v5i2.13968.74-81

Abstract

Previous reports showed that there has been a continuous increase in the annual production of onion in Indonesia, and it is inversely proportional to the market price. The price drop is often caused by the high water content, which makes it easy to rot. Preservation of onions through a tray dryer is a good preservation method because it is effective and does not require much energy. Therefore, this study aims to determine the effect of variations in time, material thickness, and air velocity on the drying rate of onions. The samples were sliced to a size of 2 - 5 mm, followed by drying for 60 min using a tray dryer with different air rates between 4 - 7 m/s, and the rate of the process was observed every 15 min. The results showed that the drying time reduced the humidity in the chamber. The highest rate of 0.525 g/min was obtained at the peak air rate of 7 m/s. ANOVA results revealed that variations in time, onion thickness, and flow rate have a significant effect on increasing the drying rate of onions. This indicates that the method can be an effective and efficient solution to optimize the drying of the commodity.
Penggunaan Media Peraga Berbasis Energi Terbarukan Guna Menunjang Model Pembelajaran Student-Centered Learning di SDN Ajung 01 Kalisat Fadhilah, Nur; Risanti, Doty Dewi; Wahyuono, Ruri Agung; Sawitri, Dyah; Mawarani, Lizda Johar; Muharja, Maktum
Sewagati Vol 9 No 1 (2025)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v9i1.2403

Abstract

Pengembangan media pembelajaran berbasis energi terbarukan dilakukan untuk mendukung implementasi Kurikulum Merdeka yang berfokus pada pembelajaran berbasis siswa (student-centered learning) dan pendekatan eksperimen. Media ini mencakup alat peraga yang memanfaatkan energi surya, angin, dan air, serta dilengkapi modul pembelajaran dan Lembar Kerja Siswa (LKS). Berdasarkan observasi di SDN Ajung 01 Kalisat Kabupaten Jember, keterbatasan media pembelajaran menjadi hambatan dalam penerapan Kurikulum Merdeka. Proses pembelajaran energi terbarukan cenderung bersifat teoretis tanpa visualisasi yang memadai. Untuk mengatasi hal ini, media pembelajaran yang dikembangkan tidak hanya mendemonstrasikan prinsip kerja energi terbarukan, tetapi juga memungkinkan siswa melakukan eksplorasi dan praktik langsung. Monitoring program selama empat bulan menunjukkan hasil yang positif. Siswa mengalami peningkatan pemahaman signifikan, sebagaimana terlihat dari hasil pretest dan posttest. Analisis berdasarkan Taksonomi Bloom menunjukkan capaian yang baik pada aspek kognitif, psikomotor, dan afektif. Selain itu, guru memberikan respon yang sangat baik terhadap media ini karena relevansinya dalam mendukung pembelajaran aktif dan inovatif.
Analisis Pengaruh Penambahan Koagulan Terhadap Kualitas Tetes Tebu dalam Proses Dekalsifikasi sebagai Bahan Baku Pembuatan Monosodium Glutamate Shofia Khoirunissa, Dita; Ramadhani, Salsabila Amania; Darmayanti, Rizki Fitria; Muharja, Maktum; Khotimah, Husnul; Ayu Salsabila, Putri
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.22196

Abstract

One of the challenges in preparing MSG raw materials is the reduction in the quality of molasses due to changes in the sugar production process. This research aims to evaluate the impact of adding coagulants on improving the quality of molasses in the Industrial MSG preparation. The materials used consist of sugar cane molasses and Sodium polyacrylate with varying concentrations of 5-20 ppm. Analysis was carried out on the percentage of total solids (%TS) using the sludge reduction rate method, and by comparing the total solution volume with the sludge height. The results showed that the addition of coagulant had a significant effect on the rate of sludge formation. The optimum point was achieved by adding 20 ppm of coagulant, which was able to achieve sludge reduction stability within 0.5 hours. Optimal operational conditions occur at a temperature of 55℃, pH 2.5-2.6, and a sugar content of 37%. The important role of the coagulant solution volume was seen in accelerating the deposition process, which had a significant impact (P 0.1). Although this condition has the potential to accelerate improvements in the quality of molasses in the production process, it still requires an assessment of the economic impact on overall production profits. The addition of coagulants was identified as a solution to improve the quality of molasses which was decreasing.
Modifikasi Fe3O4 dari Pasir Besi Pantai dengan Asam Oleat dan PEG melalui Metode co-Precipitation untuk Menangani Limbah Mikroplastik PET di Air Laut Mumtazah, Zuhriah; Bima Suci, Syeikh Maulana; Hakiki, Rizki Maulana; Muharja, Maktum; Palupi, Bekti; Rahmawati, Istiqomah; Yolanda Putri, Ditta Kharisma; Ramadana, Ifan
Jurnal Ilmu Lingkungan Vol 23, No 2 (2025): March 2025
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.23.2.418-426

Abstract

Mikroplastik diartikan sebagai plastik yang berukuran kurang dari 5 mm. Mikroplastik telah terdeteksi secara luas di lingkungan perairan dan menjadi kontaminan yang sangat mengkhawatirkan. Oleh karena itu sangat diperlukan cara untuk menghilangkan mikroplastik dari air secara efektif. Tujuan dari penelitian ini yaitu untuk mengetahui pengaruh penambahan surfaktan asam oleat (OA) dan polietilen glikol (PEG) pada nanopartikel magnetit untuk pemisahan mikroplastik polyethylene terephthalate (PET) di media air. Penambahan surfaktan memungkinkan nanopartikel dapat terdispersi dengan baik dan lebih stabil. Nanopartikel magnetit disintesis dari pasir besi pantai Watu Ulo Jember dengan metode co-precipitation. Nanopartikel magnetit dikarakterisasi menggunakan PSA untuk mengetahui distribusi ukuran partikel dan FTIR untuk menentukan gugus fungsi pada n-Fe3O4 yang telah dimodifikasi dengan OA dan PEG. Ukuran partikel yang didapatkan berkisar antara 458,7–955,4 nm dengan intensitas tertinggi 712,4 nm. Efisiensi adsorpsi mikroplastik yang diperoleh menggunakan n-Fe3O4 adalah 77,8%, n-Fe3O4/PEG 91,7%, dan n- Fe3O4/OA 95,2%.
Co-Authors Abdul Halim Achmad Chumaidi, Achmad Achri Isnan Khamil Adelia Rosalina Afrila Tutut Dwijati Lestari Agra Bachtiar Andika Prastika Ari Susanti Arief Widjaja Arshy, David Permana Aswie, Viqhi Atiqa Rahmawati Atiqa Rahmawati Ayu Salsabila, Putri Badril Azhar Batuthoh, M. Wildan Ibnu Bekti Palupi Bima Suci, Syeikh Maulana Boy Arief Fachri Bramantyo Airlangga Candra Wijaya, Candra Diana Fitriati Difka Augustina Diana Sari Dimas Nur Herdianto Ditta Kharisma Yolanda Ditta Kharisma Yolanda Putri Doty Dewi Risanti Dwina Moentamaria Dyah Ayu Savitri Dyah Sawitri Dyah Sawitri Fadilah, Siska Nuri Felix Arie Setiawan Filial Ahliana Rahmaniyah Firmansyah, Arfian Alwi Hakiki, Rizki Maulana Hanggara Sudrajat Hanny F. Sangian Helda Wika Amini Helda Wika Amini Helgananta Adirya Sabian Heni Pujiastuti Hesti Lipuring Tyas Hidayatullah Hidayatullah Husnul Khotimah I Made Arimbawa I Made Arimbawa I Made Arimbawa Ilham Alamsah Ilham Alamsyah Indrayani, Lilin Irdatus Sholeha Irfan Albana Irfin, Zakijah Istiqomah Rahmawati Jayyid Zuhdan Jihan Nafila Wibowo Karima, Nur Kenji Sakai KENJI SONOMOTO Kenji Sonomoto Khamil, Achri Isnan Khotimah , Husnul Lestari, Afrila Tutut Dwijati Lieke Riadi Lizda Johar Mawarani M. Zikrillah Maharani, Regita Gustiayu Pramisti Mahfud Mahfud Meta Fitri Rizkiana Ming Gao Mohammad Abdul Aziz Fajar Mohammad Nashir Idham Kholid Mohammad Nazarudin Ali Muhammad Rizalluddin Mutiara Rengganis Nurul Putri Azhari Nailufhar , Lili Niki Etruly Nova Chintya Kurniawati Nugroho, Imam Wahyu Beny Nur Fadhilah Nur Fadhilah Nur Fadhilah Nur Fadhilah Nur Karima Nurtsulutsiyah Nurtsulutsiyah Ramadana, Ifan Ramadhani, Salsabila Amania Rekha Aliyya Isma Rizki Fitria Darmayanti Rizki Fitria Darmayanti Ruri Agung Wahyuono Salsabila, Putri Ayu Sangadji, Ningsi Lick Shofia Khoirunissa, Dita Sholeha, Irdatus Siska Nuri Fadilah Siska Nuri Fadilah Siska Nuri Fadilah Siska Nuri Fadilah Sjarief Widjaja Susilowati Susilowati Tantular Nurtono Tao Zhao Tri Dwinanda Nursoliha Tri Widjaja Tyas , Hesti Lipuring Wardani, Salza Belila Kusuma Wibowo, Jihan Nafila Yakub Hendrikson Manurung Yakub Hendrikson Manurung Yolanda Putri, Ditta Kharisma Yukihiro Tashiro Zakia Ainun Salsabila Zikrillah, M. Zuhriah Mumtazah