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All Journal TEKNIK Dedikasi: Jurnal Pengabdian kepada Masyarakat JURNAL REKAYASA KIMIA & LINGKUNGAN Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Permanadewi, Indrasukma
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Humanities Chemical Engineering, Chemistry & Bioengineering Education Energy Engineering Social Sciences Other

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Analisis Pengaturan Temperatur, Konsentrasi, dan Waktu Pengadukan pada Tekanan Atmosferik untuk Meningkatkan Kepresisian Densitas Larutan Alginat Permanadewi, Indrasukma; Kumoro, Andri Cahyo; Wardhani, Dyah Hesti; Aryanti, Nita
TEKNIK In Press
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.35994

Abstract

Alginat merupakan polimer polisakarida linier yang sangat mudah larut dalam air dengan densitas dan viskositas yang dapat diatur sesuai keperluan. Sifat khas ini membuat alginat banyak digunakan dalam industri pangan maupun non pangan. Seperti pada kebanyakan bahan alam lainnya, densitas larutan alginat pada umumnya juga dipengaruhi oleh temperatur, konsentrasi dan waktu pengadukan. Karenanya, penelitian ini bertujuan untuk meningkatkan kepresisian densitas larutan alginat dengan pengaturan temperatur (30, 45, 60 dan 75°C), konsentrasi alginat (1, 2, 3, 4 dan 5% massa) dan waktu pengadukan (15, 30, 45 dan 60 menit) menggunakan metode piknometri. Hasil penelitian menunjukkan bahwa semakin tinggi temperatur maka densitas akan semakin rendah, sebaliknya semakin tinggi konsentrasi dan waktu pengadukan maka densitas larutan alginat akan semakin meningkat. Dengan demikian, dapat disimpulkan apabila menginginkan densitas larutan alginat 0,9228 g/ml maka konsentrasi alginat yang digunakan 2% dengan suhu 30°C dan waktu pengadukan 30 menit.
Pendampingan Pembuatan Biobriket Dari Pemanfaatan Sumber Daya Lokal Limbah Sabut Kelapa di Desa Kemujan Karimunjawa Kusumaningrum, Maharani; Pradnya, Irene Nindita; Wulansarie, Ria; Zakia, Maulida; Bahlawan, Zuhriyan Ash Shiddieqy; Imani, Nadya Alfa Cahaya; Permanadewi, Indrasukma; Salsabila, Luvena; Suwandi, Luluk Arvi Cahyaning; Wati, Afifah Sagita Fitria; Syahputra, Adhika Bintang; Fandika, Putri Maharani Adinda; Pramitha, Deva Aurelya; Pratama, Muhammad Herdi; Diana, Savira Rahma; Sadan, Serlia Fitri; Imanullah, Kautsar Taqi
Dedikasi:Jurnal Pengabdian kepada Masyarakat Vol. 5 No. 1 (2024): Jurnal Dedikasi
Publisher : Universitas Jayabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31479/dedikasi.v5i1.360

Abstract

Abstrak Desa Kemujan, yang terletak di Kecamatan Karimunjawa, memiliki potensi besar dalam memanfaatkan limbah sabut kelapa sebagai bahan baku biobriket. Dengan luas wilayah 162,1 km² dan populasi 3.391 jiwa, desa ini memiliki keberagaman budaya dan suku yang kaya. Limbah sabut kelapa yang terdapat di Desa Kemujan pada saat ini belum dimanfaatkan secara optimal. Hal ini terjadi karena minimnya kesadaran dan pengetahuan masyarakat sekitar untuk mengolah sabut kelapa tersebut. Sabut kelapa merupakan biomassa yang dapat dimanfaatkan sebagai bahan alami pembuatan biobriket. Sehingga pengabdian melalui pendampingan dan pelatihan pembuatan biobriket untuk memanfaatkan sumber daya lokal sabut kelapa di Desa Kemujan Karimunjawa perlu diselenggarakan. Metode pelaksanaan yang dilakukan dalam pengabdian ini adalah sosialisasi terkait biobriket dan pelatihan pembuatan biobriket dari sabut kelapa secara langsung. Hasil yang didapat dari pengabdian ini adalah meningkatkan nilai guna dan nilai ekonomis sabut kelapa, berkontribusi pada pengembangan UMKM di Desa Kemujan, serta meningkatkan kesadaran dan pengetahuan masyarakat terkait pemanfaatan limbah sabut kelapa serta proses pembuatan biobriket dari sabut kelapa. Keywords: Biobriquettes; Coconut Husk; Waste
Alternative Design of a Pneumatic Conveying Machine for Rice Husk as A Coal Substitute for Rotary Kiln Fuel in Cement Factories Permanadewi, Indrasukma; Febry Ibrahim, Ahmad; Azzahra Putri Solihin, Syifa; Aldiansyah, Rizky
Rekayasa Vol. 22 No. 2 (2024)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v22i1.18907

Abstract

The reduced amount of coal transported to cement factories is being diverted to rice husk, which is biomass, to facilitate the use of increasingly expensive coal. This transition is necessary due to the different characteristics of rice husk compared to coal. Additionally, the combustion process in rotary kilns requires extremely high temperatures (1,400–1,500°C). However, a significant portion of the generated energy is lost through the kiln walls, exhaust gases, and heat radiation. These heat losses reduce thermal efficiency and increase fuel consumption. Coal, fuel oil, and natural gas are the primary energy sources for cement kilns, which are not only expensive but also have negative environmental impacts. The fluctuation in fossil fuel prices further affects overall cement production costs. To address these challenges, cement factories must design an efficient rice husk conveying system from storage to the rotary kiln. Transporting rice husks with air ensures no unintended reactions while allowing smooth flow through closed horizontal and vertical transport pipes commonly used in the industry. This study aims to design a pneumatic conveying machine with a closed air pressure system to transport biomass (rice husks) at a capacity of 7 tons/hour as an alternative fuel for rotary kilns in the cement industry. The design method follows several stages, including practical work experience, literature review, material selection, design considerations, conceptual design, calculations, and technical drawings. The proposed system utilizes the dilute phase method, with a blower power of 49.26523 kW pushing the rice husks toward the hopper. The pipeline flow parameter, measured as the pressure drop, is 132.9673 kPa. The selected materials include galvanized iron pipes with two elbows to connect horizontal and vertical sections.
Microencapsulation of Watermelon Rind Extract (Citrullus Lanatus) Using Maltodextrin and Gum Arabic as a Food Supplement Applications Kusumaningrum, Maharani; Imani, Nadya Alfa Cahaya; Permanadewi, Indrasukma; Ardhiansyah, Hanif; Handayani, Dwi; Situmorang, Monatalia Lamtama; Rizkiyana, Luthfi; Audyaz-Zahra, Chealsy Zafarina; Indriawati, Aisya Eka
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 2 (2025): Jurnal Rekayasa Kimia & Lingkungan (December, 2025) In Press
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i2.45954

Abstract

The food and beverage sector generates a large amount of organic waste, one of which is watermelon rind. Although it contains bioactive compounds such as lycopene, vitamin C, and phenolic compounds with antioxidant properties, watermelon rind is often discarded due to the rapid degradation of these compounds by light and temperature. This study proposes a solution to the aforementioned issue: the microencapsulation of watermelon rind (Citrullus lanatus) extract obtained through maceration. The process utilizes maltodextrin and gum arabic as coating materials and employs oven drying at temperatures of 45C, 50C, and 55C. The DPPH method evaluated strong antioxidant activity with an IC50 value of 70 ppm. Principal component analysis showed the content of Ethyl isoallocholate (31.80%), 5-Hydroxymethylfurfural (7.25%), 7,8-Epoxylanostan-11-ol, 3-acetoxy- (6.10%), and 2,4-Dihydroxy-2,5-dimethyl-3(2H)-furan-3-one (4.04%), where Ethyl isoallocholate inhibited DPPH radicals by 88%. The optimal formulation was achieved with an extract:solvent ratio of 20:80 and a maltodextrin and gum arabic ratio of 1:0, at 50C, yielding 81.161%. The microcapsules formed showed a spherical morphology, a smooth surface and showed small micro-cracks, and an average diameter between 20-80 m. Formulation with maltodextrin and gom arabic ratio of 3:4 at 55C produced the highest solubility (99.92%) and the lowest moisture content (0.97%). This study shows that microencapsulation is able to protect active compounds from degradation and has the potential to become a quality food supplement from natural ingredients, as well as supporting the reduction of organic waste and environmentalpreservation.
Co-Authors Aldiansyah, Rizky Andri Cahyo Kumoro Ardhiansyah, Hanif Audyaz-Zahra, Chealsy Zafarina Azzahra Putri Solihin, Syifa Bahlawan, Zuhriyan Ash Shiddieqy Diana, Savira Rahma Dwi Handayani Dyah Hesti Wardhani Fandika, Putri Maharani Adinda Febry Ibrahim, Ahmad Imani, Nadya Alfa Cahaya Imanullah, Kautsar Taqi Indriawati, Aisya Eka Maharani Kusumaningrum Maulida Zakia Nita Aryanti Pradnya, Irene Nindita Pramitha, Deva Aurelya Pratama, Muhammad Herdi Ria Wulansarie, Ria Rizkiyana, Luthfi Sadan, Serlia Fitri Salsabila, Luvena Situmorang, Monatalia Lamtama Suwandi, Luluk Arvi Cahyaning Syahputra, Adhika Bintang Wati, Afifah Sagita Fitria