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Synthesis and Performance Evaluation of Cellulose-based Slow-release Fertilizer: A Review Dhyna Analyes Trirahayu; Ridwan P. Putra; Achmad Syarif Hidayat; Muhammad Iqbal Perdana; Erwina Safitri
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 1 (2022): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i1.15731

Cellulose-based materials are attractive candidates for the fabrication of sustainable and eco-friendly slow-release fertilizers. The ability of the cellulose structure to be modified and functionalized makes it promising as a scaffold backbone in the development of advanced agricultural materials. In this review, different synthesis techniques of cellulose-based slow-release fertilizers are discussed. Crucial parameters in the design of the slow-release fertilizers (i.e., slow-release behavior, water retention properties, and biodegradability) are presented. The applications of cellulose-based fertilizers in enhancing the growth of agricultural and horticultural commodities are provided. To date, solution polymerization is more widely employed in the preparation of cellulose-based slow-release fertilizers due to its low cost and simple operation, with no solvent recovery required. Esterification tends to be the most typical reaction during the synthesis of the fertilizers because of its high substrate solubility and more straightforward product purification. This review can be used as a reference to develop other efficient cellulose-based slow-release fertilizers that can be utilized to delay the release of fertilizers and prevent the overuse of fertilizers.

Characteristics Of Microbubbles Generated From Perforated Plates Dhyna Analyes Trirahayu; Ridwan P. Putra; Joshua Mulia Nababan; Mubiar Purwasasmita
Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Vol 4, No 1 (2022): JPPL, Maret 2022
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/jppl.v4i1.1196

Microbubbles are emerging as versatile tools in numerous scientific and engineering disciplines. However, the applications of microbubbles in agricultural fields require a simple and cost-effective device that can be used to generate microbubbles. In this study, a new approach to producing microbubbles was developed using perforated plates incorporated with glass columns. Two different plates with various numbers of holes were fabricated. Characterization of the microbubbles showed that the diameter of the microbubbles produced was in the range of 10.4 to 21.1 µm. The gas-liquid ratio tended to increase by around 30-40%, with increasing oxygen gas flow rate and gas-jetting time. The enhanced oxygen gas flow rate and gas-jetting time also prolonged the residence time of the microbubbles. In general, this technique is promising that can be implemented in agricultural sectors, especially in hydroponic systems.

Pengaruh Gelling Agent terhadap Pembentukan Oleogel Berbasis Canola Oil Dhyna Analyes Trirahayu; Budi Santoso
Fluida Vol 12 No 2 (2019): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v12i2.1618

Indonesia merupakan negara dengan kekayaan hayati tinggi. Salah satu hasil kehutanan yang melimpah di Indonesia adalah pulp. Selain sebagai kertas, pulp juga dapat diolah menjadi produk turunan lain yang memiliki nilai jual lebih tinggi, salah satunya selulosa. Kandungan selulosa dalam pulp cukup tinggi dapat mencapai lebih dari 90%. Dari selulosa ini banyak produk turunan yang dapat dihasilkan dengan nilai ekonomi yang lebih tinggi dan sangat bermanfaat. Turunan selulosa dapat dimanfaatkan sebagai gelling agent salah satunya untuk membentuk oleogel. Oleogel adalah gel di mana fasa cairnya adalah minyak, berbeda dengan hidrogel, yang memiliki fasa cair air. Potensi aplikasi dari oleogel sangat beragam di industri makanan, farmasi, kosmetik, dan petrokimia. Salah satu produk turunan selulosa yang dapat dimanfaatkan sebagai gelling agent adalah hydroxypropyl methyl cellulose (HPMC). Penelitian ini bertujuan untuk melakukan observasi terhadap pembentukan oleogel berbasis minyak canola dengan menggunakan HPMC dan Xanthan Gum (XG) sebagai gelling agents. Pembentukan oleogel dilakukan menggunakan kombinasi HPMC dan XG dengan komposisi yang divariasikan menggunakan metode pengadukan. Oleogel terbaik diperoleh menggunakan kombinasi gelling agent HPMC : XG = 1 : 1 sebanyak 2 gr (2% b/b).

Hydrodynamics of Fluid Flow in Fixed-Beds Composed of Sand Particles and Hollow Fiber Membrane Pipes Ridwan P. Putra; Dhyna Analyes Trirahayu; Khairul Hadi Burhan; Fauzian Ichsan; Mubiar Purwasasmita
Fluida Vol 13 No 1 (2020): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v13i1.2269

ABSTRAK Kompos artifisial yang dibuat dari bahan polimer baru-baru ini menarik perhatian peneliti sebagai pupuk yang tahan lama dan dapat meningkatkan produktivitas tanaman tanpa menimbulkan dampak yang besar pada lingkungan. Dalam penelitian ini, pipa membran hollow fiber (HFMP) yang terbuat dari bahan polipropilen dan pasir kuarsa, masing-masing digunakan sebagai model kompos artifisial dan partikel tanah. Hidrodinamika unggun yang terdiri dari HFMP dan pasir kuarsa diteliti dengan menggunakan metode falling-head. Hasil percobaan menunjukkan bahwa unggun yang ditambahkan HFMP mengalami peningkatan porositas unggun. Unggun dengan fraksi HFMP yang lebih tinggi menunjukkan kemampuan menahan air yang lebih rendah, yang mengindikasikan kemampuan yang buruk dari bahan polipropilen dalam menahan molekul air. Sebaliknya, permeabilitas yang lebih tinggi pada unggun yang ditambahkan HFMP menunjukkan aliran cairan yang lebih baik. Studi ini mengungkap potensi kompos artifisial yang dapat diterapkan dalam teknologi pertanian berkelanjutan. Kata kunci: Hidrodinamika, kapasitas menahan air, porositas, permeabilitas, kompos buatan ABSTRACT Artificial compost fabricated from polymer materials has recently attracted considerable interest as a highly durable fertilizer that could enhance plant productivity without harming the environment. In this study, polypropylene hollow fiber membrane pipes (HFMP) and quartz sand particles were employed as models of the artificial compost and soil particles, respectively. The hydrodynamics of various volumetric ratios of beds composed of the HFMP and the quartz sand were investigated using a falling-head technique. The results show that the bed supplemented with the HFMP demonstrated enhanced bed porosity. The bed with a higher HFMP fraction exhibited slightly less water-holding capacity, which suggests the poor ability of the polypropylene material to retain water molecules. On the contrary, the higher permeability of the bed amended with the HFMP indicates improved water flow. This study unfolds the potential of artificial compost that can be implemented in sustainable agricultural technology. Keywords: Hydrodynamics, water-holding capacity, porosity, permeability, artificial compost

Pengembangan Oleogel dengan Memanfaatkan Hydrocolloids dari Berbagai Sumber Sebagai Gelling Agent Dhyna Analyes Trirahayu; Ridwan P. Putra; Akhmad Zainal Abidin
Fluida Vol 15 No 1 (2022): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v15i1.3298

Minyak dan lemak dapat dijumpai dalam berbagai bentuk, dapat berupa cairan encer hingga kental, lemak yang dapat dioles hingga yang berbentuk padatan kaku. Bentuk fisik dari minyak dan lemak ini menentukan bagaimana minyak dan lemak ini dapat digunakan dan proses yang dibutuhkan untuk pemanfaatannya. Oleogel merupakan gel yang memiliki fasa cair berupa minyak, berbeda dengan hidrogel, memiliki air sebagai fasa cair. Potensi pemanfaatn oleogel sangat beragam seperti di industri makanan, farmasi, kosmetik, dan petrokimia. Dalam proses pembentukan oleogel diperlukan gelling agents. Gelling agents dapat diperoleh dari bahan yang termasuk ke dalam kelompok hydrocolloids. Bahan hydrocolloids dapat berasal dari berbagai sumber nabati maupun hewani. Penelitian ini bertujuan untuk melakukan pengamatan pengaruh kombinasi gelling agent terhadap pembentukan oleogel berbasis minyak minyak biji bunga matahari. Pembentukan oleogel dilakukan menggunakan kombinasi gellin agent berupa hydroxypropyl methyl cellulose (HPMC), xanthan gum (XG), guar gum (GG), arabic gum (AG) dengan komposisi yang divariasikan. Produk oleogel yang stabil kemudian dianalisis berupa analisa oil loss. Berdasarkan kombinasi gelling agent yang digunakan, hanya kombinasi HPMC:XG yang menghasilkan oleogel yang stabil. Oleogel terbaik diperoleh menggunakan kombinasi gelling agent HPMC : XG = 1 : 1 dengan jumlah 2 gr (2% b/b) dengan oil loss sebesar 3,99%.

Characteristics of Microbubbles Generated from Perforated Plates Dhyna Analyes Trirahayu; Ridwan P. Putra; Joshua Mulia Nababan; Mubiar Purwasasmita
Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Vol. 4 No. 1 (2022): JPPL, Maret 2022
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/jppl.v4i1.1464

Microbubbles are emerging as versatile tools in numerous scientific and engineering disciplines. However, the applications of microbubbles in agricultural fields require a simple and cost-effective device that can be used to generate microbubbles. In this study, a new approach to producing microbubbles was developed using perforated plates incorporated with glass columns. Two different plates with various numbers of holes were fabricated. Characterization of the microbubbles showed that the diameter of the microbubbles produced was in the range of 10.4 to 21.1 µm. The gas-liquid ratio tended to increase by around 30-40%, with increasing oxygen gas flow rate and gas-jetting time. The enhanced oxygen gas flow rate and gas-jetting time also prolonged the residence time of the microbubbles. In general, this technique is promising that can be implemented in agricultural sectors, especially in hydroponic systems.

Pengembangan Oleogel dengan Memanfaatkan Hydrocolloids dari Berbagai Sumber Sebagai Gelling Agent Dhyna Analyes Trirahayu; Ridwan P. Putra; Akhmad Zainal Abidin
Fluida Vol 15 No 1 (2022): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v15i1.3298

Minyak dan lemak dapat dijumpai dalam berbagai bentuk, dapat berupa cairan encer hingga kental, lemak yang dapat dioles hingga yang berbentuk padatan kaku. Bentuk fisik dari minyak dan lemak ini menentukan bagaimana minyak dan lemak ini dapat digunakan dan proses yang dibutuhkan untuk pemanfaatannya. Oleogel merupakan gel yang memiliki fasa cair berupa minyak, berbeda dengan hidrogel, memiliki air sebagai fasa cair. Potensi pemanfaatn oleogel sangat beragam seperti di industri makanan, farmasi, kosmetik, dan petrokimia. Dalam proses pembentukan oleogel diperlukan gelling agents. Gelling agents dapat diperoleh dari bahan yang termasuk ke dalam kelompok hydrocolloids. Bahan hydrocolloids dapat berasal dari berbagai sumber nabati maupun hewani. Penelitian ini bertujuan untuk melakukan pengamatan pengaruh kombinasi gelling agent terhadap pembentukan oleogel berbasis minyak minyak biji bunga matahari. Pembentukan oleogel dilakukan menggunakan kombinasi gellin agent berupa hydroxypropyl methyl cellulose (HPMC), xanthan gum (XG), guar gum (GG), arabic gum (AG) dengan komposisi yang divariasikan. Produk oleogel yang stabil kemudian dianalisis berupa analisa oil loss. Berdasarkan kombinasi gelling agent yang digunakan, hanya kombinasi HPMC:XG yang menghasilkan oleogel yang stabil. Oleogel terbaik diperoleh menggunakan kombinasi gelling agent HPMC : XG = 1 : 1 dengan jumlah 2 gr (2% b/b) dengan oil loss sebesar 3,99%.

Pengaruh Penggunaan Bioreaktor Dua Tahap terhadap Pengolahan Anaerobik Lindi Sampah Kota Laily Isna Ramadhani; Alifa Dewi Kirana; Ghinaa Annisa Khairani; Herawati Budastuti; Dhyna Analyes Trirahayu; Keryanti
Jurnal Serambi Engineering Vol. 9 No. 4 (2024): Oktober 2024
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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

The generation of waste in landfills can result in the production of wastewater, commonly referred to as leachate. This leachate has the potential to pollute the surrounding environment, as it can enter the groundwater or be transported by surface flows. Consequently, leachate treatment is conducted through a two-stage anaerobic process. The method was selected due to its capacity to decompose waste with high organic content and to produce optimal biogas. The objective of this study is to ascertain the impact of employing a two-stage anaerobic bioreactor on the proliferation of anaerobic microorganisms in the context of leachate treatment. The application of an acidic pH in the acidogenic bioreactor influences the growth of acidogenic bacteria, resulting in a shorter lag phase in comparison to the single bioreactor. This also impacted the reactor's performance in reducing the concentration of chemical oxygen demand (COD). The two-stage bioreactor demonstrated a superior COD reduction efficiency of 78%, in comparison to the single-stage bioreactor, which exhibited an efficiency of 69%.

Performance of Cellulose and Gum-based Oleogelators to Form Oleogels in Different Oil Systems Trirahayu, Dhyna Analyes; Abidin, Akhmad Zainal; Putra, Ridwan P.; Hidayat, Achmad Syarif; Perdana, Muhammad Iqbal
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 2 (2024): June 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i2.137

One of the formed fats that is attracting attention as an alternative to trans-fat is oleogel. Oleogels can be formed using edible and non-edible vegetable oils, depending on the desired application. In this study, we used an emulsion-template approach with three oil systems: canola oil, sunflower oil, and castor oil, and combined hydroxypropyl methylcellulose (HPMC) and xanthan gum (XG) as oleogelators in specific ratios to form oleogel. Stable oleogels were formed when both oleogelators were present in the system. The oil binding capacity of the oleogel with respect to the amount of oil loss varied from less than 5% to more than 30%, depending on oil saturated fatty acid composition and HPMC:XG ratio. Higher saturated fatty acid concentration in the oil strengthens the oleogel matrix and reduces the oil loss rate. High HPMC composition and low XG composition reduce the oil binding ability of oleogels. In oleogel systems, HPMC acts as an emulsifier and XG acts as a thickener, resulting in a lower-than-average XG concentration and a thinner gel. Although the structure and color of oleogels are very stable over 28 days of storage, the rate of oxidation still needs to be minimized. Heating the oleogel system and the presence of aqueous phase can accelerate the oxidation of the oleogel, which can shorten its shelf-life and limit its applications, especially in the food industry.

Evaluation of Counter Current Horizontal Screw Extractorâ€™s Performance in Determining Leaching Equilibrium of Clitoria ternatea Anthocyanins Ramadhani, Laily Isna; Hidayatulloh, Irwan; Nurcahyo; Trirahayu, Dhyna Analyes
KOVALEN: Jurnal Riset Kimia Vol. 10 No. 2 (2024): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2024.v10.i2.17005

Anthocyanin compounds as natural coloring substances contained in Clitoria ternatea flowers have higher antioxidant activity than anthocyanins from other flower extracts. Obtaining anthocyanin extract from Clitoria ternatea flower can be done using the solid-liquid extraction method. The objectives of this study include making a leaching equilibrium diagram of Clitoria ternatea flowers and determining the optimum L/S ratio and the number of equilibrium stages in the counter current horizontal screw extractor. In the maceration process, a leaching equilibrium diagram is produced, which is then used to design and determine the number of equilibrium stages. The equilibrium diagram of anthocyanins from Clitoria ternatea flowers with a gradient slope to the right is in accordance with the literature so that the equilibrium diagram can be used in the design of the extraction unit and the calculation of the theoretical stage of the multi-stage extraction unit. Based on the equilibrium diagram, the Number of Transfer Units (NTU) of 4 stages and the Height of the Transfer Unit value of this process is 0.105 m.

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