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All Journal G-Tech : Jurnal Teknologi Terapan
Retno Dewati
Universitas Pembangunan Nasional “Veteran” Jawa Timur, Indonesia
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering

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Penelitian Pupuk Biofertilizer Berbahan dasar Kulit Buah Nanas dan Abu Rumput Gajah dengan pengaruh Berat bahan dan Durasi fermentasi Dian Pratiwi Tejo Kusumo; Dimas Arnanda; Kindriari Nurma Wahyusi; Dyah Suci Perwitasari; Retno Dewati
G-Tech: Jurnal Teknologi Terapan Vol 9 No 1 (2025): G-Tech, Vol. 9 No. 1 January 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i1.6013

Abstract

This research develops a biofertilizer production method using pineapple peel waste and elephant grass ash as raw materials. Pineapple peel contains nutrients that can improve soil fertility, while elephant grass, commonly used as livestock feed, has high silica content beneficial to the soil when used as fertilizer. The research aimed to produce a biofertilizer and examine the effects of material weight and fermentation duration on the levels of Nitrogen (N), Phosphorus (P), and Potassium (K), assessing whether the results meet Indonesian National Standard (SNI) fertilizer requirements. The fermentation process lasted approximately 35 days. The fermented biofertilizer was analyzed using the Micro Kjeldahl method for Nitrogen, UV-Vis Spectrophotometry for Phosphorus, and Atomic Absorption Spectrophotometry (AAS) for Potassium. The results showed the highest concentrations of Nitrogen (2.98%), Phosphorus (2.43%), and Potassium (3.39%) were obtained using 40 grams of elephant grass ash and 35 days of fermentation. The analysis indicated that increasing the amount of elephant grass ash and the fermentation duration resulted in higher N, P, and K levels. These findings align with SNI fertilizer standards, highlighting the potential of using sustainable and easily accessible materials to enhance organic fertilizer production efficiency.
Effect of Temperature and Cellulose Mol Ratio on the Optimization of Oxalic Acid Production from Kapok Fiber Akren Alvindo Pratama; Shofwatul Athiyah; Retno Dewati
G-Tech: Jurnal Teknologi Terapan Vol 9 No 2 (2025): G-Tech, Vol. 9 No. 2 April 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i2.6628

Abstract

Until now, kapok fiber has not been fully utilized. However, kapok fiber has a high cellulose content that can be used as a basic material in the manufacture of oxalic acid. The purpose of this study was to determine how the hydrolysis temperature and the number of moles of cellulose affect the oxalic acid content produced from kapok fiber. This research was conducted in four stages, namely hydrolysis, precipitation, acidification, and crystallization. Oxalic acid crystals were then analyzed using permanganometric titration to determine the levels contained, melting point analysis, and pH to compare the characteristics of the synthesized oxalic acid with standard oxalic acid. In addition, FTIR spectroscopy analysis to determine the functional groups contained in oxalic acid. The results showed that the highest oxalic acid content was obtained in the condition of 1 mole cellulose and 70°C hydrolysis temperature, which amounted to 17.45%. The FTIR analysis results of synthetic oxalic acid and standard oxalic acid show similarities, as seen from the O-H group length of 3406.29 cm⁻¹, the C=O group length of 1687.71 cm⁻¹, the C-O group length of 1132.21 cm⁻¹, and the C-H group length of 669.30 cm⁻¹.
Co-Authors Akren Alvindo Pratama Dian Pratiwi Tejo Kusumo Dimas Arnanda Dyah Suci Perwitasari Kindriari Nurma Wahyusi Shofwatul Athiyah