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Silica Extraction From Rice Husk As Slow Release Fertilizer Using Microwave Assisted Extraction (MAE)
Dina W Indriani1, N Barunawati2, S H Sumarlan1 and L Teresia 1

1 Departement of Agricultural Engineering, Faculty of Agricultural Technology,
Universitas Brawijaya, Malang, Indonesia
2 Department of of Agricultural Cultivation Faculty of Agricultural, Universitass Brawijaya, Malang, Indonesia


Abstract

The use of raw materials from waste is now one of the alternatives in the "zero waste" effort, rice husk is one of the wastes in the process of ignoring rice. Rice husk has a very high silica content of around 80-90. Extraction of silica from rice husk can be used to make slow release fertilizer. Slow release fertilizer is a fertilizer with a nutrient release mechanism that periodically follows the pattern of nutrient absorption by plants. The tablet fertilizer application allows plants to absorb nutrients throughout the period of growth and development by minimizing the risk of loss due to washing, and avoiding the risk of excess dissolved salt. This study aims to determine the optimization of rice husk tablets by extraction using Microwave Assisted Extraction (MAE) and determine the physical and chemical properties of the results of rice husk tablet extracts. This study used a Completely Randomized Design (CRD) with two factors, namely the concentration of KOH with variations in solvents 2.5%, 5%, and 7.5% and a comparison of warm-up times of 5 minutes, 7.5 minutes and 10 minutes. the largest yield were 7.5% KOH with the longest heating time of 10 minutes of 5.30%. XRF analysis, it was found that the largest silica value was 6.51% at 5% KOH with a heating time of 5 minutes. The data obtained from the hardness test obtained the smallest value of 1,131 Kgf and the largest was 3,356 Kgf. Based on comparison with the heating conventional method, extraction had not reached optimum results of silica extract.

Keywords: Extraction, MAE, Rice Husk, Silica, Slow Release Fertilizer

Topic: AGRICULTURAL ENGINEERING

Link: https://ifory.id/abstract/EPaAzhBynKJL

Conference: INTERNATIONAL CONFERENCE ON GREEN AGRO-INDUSTRY AND BIOECONOMY (ICGAB 2019)

Plain Format | Corresponding Author (Dina Wahyu Indriani)

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