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All Journal Planta Tropika Biofoodtech : Journal of Bioenergy and Food Technology Journal of Innovation in Applied Natural Science
Widyowanti, Reni Astuti
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Physics

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The Potential of Biogas Slurry and Palm Oil Mill Effluent Slurry as Slow-Release Fertilizer Pellet Through Densification Widyowanti, Reni Astuti; Ginting, Candra; Renjani, Rengga Arnalis
PLANTA TROPIKA: Jurnal Agrosains (Journal of Agro Science) Vol 9, No 2 (2021)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/pt.v9i2.9588

Abstract

Organic fertilizer can yield higher production compared to regular fertilizer if properly applied. Thus, it can be a solution to improve nutrient content of soil. The biggest source of bio slurry in plantation is from Palm Oil Mill Effluent (POME) and cow dung biogas. This research aimed to analyze the residue’s potential from the result of biogas processing and bio slurry from POME as slow-release fertilizer pellet. Bio slurry was processed into pellet through densification process using pellet mill. The research was arranged in a Randomized Block Design method with five slurry compositions as treatments, including 70:30, 60:40, 50:50, 40:60, and 30:70 (ratio of biogas slurry and POME slurry), each consisted of three replications. According to the data obtained, fertilizer pellets had characteristics of 25 – 29 mm of length, 5.23 – 5.85 mm of diameter, 0.44 – 0.53 g/cm3 of density, 54.78% - 81.96% of durability, and 7.81% - 8.57% of moisture content. Based on density and durability aspects, 30:70 composition was the higher. Macronutrient content of the five compositions were 1.88% - 2.72%, in which on day 22, N, P, and K release was 0.36 – 1.01%, 73.51 – 97.48%, and 3.19 – 7.85%, respectively. Meanwhile, on day 17, the nutrition solution conductivity of all compositions had already reached 0.80 – 1 mS/cm.
Pengaruh Perbedaan Jenis Kulit Kopi dan Penambahan Daun Rosemary (Rosmarinus officinalis) terhadap Karakteristik Cascara Celup Butar-Butar, Awido; Sunardi; Widyowanti, Reni Astuti
BIOFOODTECH : Journal of Bioenergy and Food Technology Vol. 3 No. 1 (2024): JUNI
Publisher : Program Studi Teknologi Hasil Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55180/biofoodtech.v3i1.1324

Abstract

The objectives of this study are: (1) to determine the effect of coffee skin type with the addition of rosemary leaf powder on the characteristics of cascara dip; (2) to know the formulation of the type of coffee skin with the addition of rosemary leaf powder that produces the most preferred cascara dip for the panelists. The latest in this study is an innovation to eliminate the taste of cascara with rosemary leaf powder, as well as practical and contemporary presentation in the form of dip cascara. The research will use 2 factors. The first factor is type coffee skin (A) with 3 levels, namely A1= arabica coffee skin, A2= robusta coffee skin, and A3 = arabica and robusta coffee skin blend with a 1:1 ratio. The second factor is the addition of rosemary leaf powder by weight of cascara with 3 levels, namely B1= 2%, B2= 4%, and B3= 6%. The results of the study showed that: (1) The type of coffee skin with the addition of rosemary leaves had an effect on the tannin content, taste, and color of the cascara dip. But it has no effect on antioxidant levels, caffeine levels, total acidity, total color difference, and aroma. (2) Cascara dip made from arabica coffee bark with the addition of 2% rosemary leaves (A1B1) is a cascara that consumers prefer (somewhat like) has an antioxidant level of A1B1 37.397%, caffeine 0.97%, tannins 0.0080, total acid 0.109, total color difference 29.173, moisture content 5.57% and ash content 1.815%.
Karakteristik Papan Komposit dengan Substitusi Tandan Kosong Kelapa Sawit (TKKS) dan Perlakuan Susunan Serat Yahya, Alwi Mashudin; Partha, Ida Bagus Banyuro; Widyowanti, Reni Astuti
BIOFOODTECH : Journal of Bioenergy and Food Technology Vol. 4 No. 1 (2025): JUNI
Publisher : Program Studi Teknologi Hasil Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55180/biofoodtech.v4i1.1859

Abstract

Composite boards are generally made from plastic and natural wood, on the one hand, oil palm empty fruit bunches (TKKS) which are palm oil mill waste contain lignocellulose which is one of the requirements for composite board making materials. This study aims to determine the effect of TKKS fiber substitution on composite boards, determine the effect of TKKS fiber arrangement on composite boards, determine the composition of TKKS substitution and TKKS fiber arrangement that produces composite boards that are suitable for their uses. This research uses the Complete Block Design (RBL) method with 2 factors. The first factor is the substitution of TKKS based on 20 grams of sengon powder with 3 levels, namely 40% (8 grams), 50% (10 grams), 60% (12 grams). The second factor is the arrangement of the TKKS fibers with 3 levels, namely random, parallel, cross. The results of this study indicate that the substitution of TKKS with sengon powder base affects the chemical properties, namely water content, as well as physical properties in the form of water absorption, thickness development, density, porosity, and flexibility in composite boards. The arrangement of TKKS fibers affects the physical properties which include water absorption, thickness development, density, porosity, and flexibility of the composite board. The best results of this study were found in the treatment of 40% sengon powder: 60% TKKS fiber with an average value of 3,493% moisture content, 27,581% water absorption, 2,241% thick development, 2,13 g/cm3 density, 27,189% porosity, and 63.641 kgf/cm2 flexibility value is the most brittle sample so it is suitable to be applied to furniture such as tables, cabinets, and stacking shelves.  
Application of the Semi-Batch Method in Biodiesel Processing Using Refined Bleached Deodorized Palm Oil (RBDPO) with Variations in Feed Addition and Temperature Faizin, Indra Muhammad; Bimantio, Mohammad Prasanto; Widyowanti, Reni Astuti
Journal of Innovation in Applied Natural Science Vol. 2 No. 1 (2026): Journal of Innovation in Applied Natural Science
Publisher : CV Media Inti Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58723/jinas.v2i1.154

Abstract

Background: Biodiesel production efficiency is strongly influenced by reaction method, temperature, and reactant feeding strategy. Semi-batch transesterification offers better molar ratio control and reduced methanol waste compared to conventional batch systems. Aims: This study analyzes the effect of feed addition frequency and reaction temperature on biodiesel efficiency and characteristics using Refined Bleached Deodorized Palm Oil (RBDPO) as raw material. Methods: A Complete Block Design with two factors was applied: feed addition frequency (4×, 5×, 6× per period) and reaction temperature (40°C, 50°C, 60°C) with two replications. Biodiesel was produced using semi-batch transesterification with sodium methylate catalyst. Parameters measured included yield, density, pH, water content, glyceride profile, and methyl ester content. Data were analyzed using Duncan’s Multiple Range Test (5%). Result: The best treatment was 5× feed addition, 50°C, producing the highest methyl ester content (67.18%), yield (92.98%), density (877 kg/m³), pH 6.78, and low water content (1,401 ppm). Most quality parameters approached SNI 7182:2015 biodiesel standards. Conclusion: Semi-batch operation improves conversion control but is not yet fully optimal due to reverse reactions. Further optimization of methanol ratio and reaction time is required to suppress monoglyceride and diglyceride reformation.
Co-Authors Bimantio, Mohammad Prasanto Butar-Butar, Awido Candra Ginting Faizin, Indra Muhammad Ida Bagus Banyuro Partha Renjani, Rengga Arnalis Sunardi Yahya, Alwi Mashudin