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Harunsyah, H
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Materials Science & Nanotechnology

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CREATION OF LOCAL MICROORGANISMS (MOLES) WITH THE USE OF HOUSEHOLD VEGETABLE WASTE AS A STARTER/DECOMPOSER FOR COMPOST FERTILIZER MAKING Mukarramah, Cut; Harunsyah, H; Nahar, N
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.6145

Abstract

ABSTRACTLocal Microorganisms (MOL) are microorganisms made from natural materials as a medium for the development of microorganisms that are useful for accelerating the destruction/decomposition of organic matter (the process of decomposition into compost/organic fertilizer). In addition, it can also function as additional nutrients for plants, Local Microorganisms contain macro and micro nutrients and also contain microbes that have the potential to be a catalyst for organic matter, growth stimulants and as plant disease pest control agents. Based on the content contained in the MOL, MOL can be used as a decomposer, biofertilizer, and as an organic pesticide. This type of research is an experiment, by making a formulation of MOL solution based on the content/concentration of coconut water in the MOL solution, the bacterial content in the sample based on laboratory testing of Samples 1.2 and 3 with values (3.57 x 106 CFU/ml, 3.86 x 106 CFU/ml and 3.94 x 106 CFU/ml). The purpose of making the formulation of MOL solution in this study is to see the effectiveness of local microorganisms (MOL) in accelerating/shortening the time of the decomposition process of organic waste in making compost, the fastest decomposition value/time in samples 1-4 with the amount of stsrter/decomposer solution used 1 liter requires a decomposition time of 5 weeks.Keywords: Local Microorganisms, Starter/Decomposer, Compost Fertilizer
THE EFFECT OF CRITICAL PARAMETERS ON THE OIL SEPARATOR VESSEL (102D1) TO REDUCE THE VALUE OF FATTY ACID ESTER (FAE) IN THE GLYCERIN WATER PRETREATMENT UNIT AT PT. DOMAS AGROINTI PRIMA Siswanto, Rudi; Salmyah, S; Harunsyah, H
Jurnal Sains dan Teknologi Reaksi Vol 22, No 02 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i02.6151

Abstract

ABSTRACTGlycerin water produced from the hydrolysis process in the splitting column still contains impurities such as oil or fatty acids that are carried along with glycerin water or other impurities found in the raw oil itself such as solid particles and gum. Oil or fatty acids that are still present in glycerin water must be removed or lowered to the maximum permissible limit before further processing in glycerin evaporation units and glycerin distillation units. The quality standard set for glycerin water is the value of fatty acid ester (FAE) in glycerin water. Glycerin water will be treated first in the glycerin water pretreatment unit to remove the oil and fatty acid content. Oil separator vessel (102D1) is one of the tools in the glycerin water pretreatment unit, is one of the important ones to control in the glycerin water pretreatment unit. Where in this oil separator vessel there will be an initial separation between oil and fatty acid with glycerin water. Optimization of separation in oil separator will determine the decrease in FAE value in (102D1) treated glycerin water end product. Observations were made on the oil separator vessel, namely temperature and pH to see both parameters of this process against the decrease in the value of fatty acid ester, data collection for temperature and pH was carried out 3 times a day for 6 days for each still paremeter to determine the value of fatty acid ester. From the observed data on the oil separator device, there are two parameters that determine the separation of oil and fatty acid from glycerin water, namely temperature and pH. The results obtained that temperature and pH greatly affect the value of fatty acids, where the higher the temperature, the lower the FAE value, from the observation data the optimum temperature is 90 – 95 oC. pH also greatly affects the value of fatty acid ester after oil separator, where the clover's pH is low in its fatty acid ester value. From the observed data, the optimum pH is pH 2 – 3.5Keywords: Fatty Acid Ester, Oil Separator, Pretreatment Glycerin Water, pH, Temperatur
OPTIMIZATION OF SWEETENER ISOLATION FROM STEVIA LEAVES USING RESPONSE SURFACE METHODOLOGY (RSM) Kamila, K; Fachraniah, F; Harunsyah, H
Jurnal Sains dan Teknologi Reaksi Vol 23, No 02 (2025): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v23i02.8921

Abstract

The optimization of sweetener isolation from stevia leaves was carried out using the Response Surface Methodology (RSM). This study aimed to optimize the isolation process of sweeteners from Stevia rebaudiana Bertoni through RSM. The independent variables used were the number of extraction cycles (A) and particle size of the material (B), with four response parameters: extract yield percentage, sweetness level (%Brix), calorie content, and sweetness intensity. The experimental design applied the Central Composite Design (CCD) with quadratic regression model analysis. The results showed that both independent variables had significant effects on the response parameters, either individually or through interaction. Finer particle size (60–70 mesh) combined with the optimal number of extraction cycles enhanced sweetness and reduced the calorie content of the extract. The optimum conditions were obtained at 70 mesh particle size and two extraction cycles, with predicted values of 6.93% yield, 5.80% Brix sweetness, 27.02 kcal/100 g calories, and a sweetness intensity of 7.08. Model validation confirmed a good agreement between predicted and actual values, indicating that RSM is effective for optimizing the sweetener isolation process from stevia leaves. Keywords: Extraction, Extraction cycle, Optimization, Particle size, RSM (Response Surface Methodology), Stevia.
Co-Authors Fachraniah, F Kamila, K Mukarramah, Cut Nahar, N Rudi Siswanto, Rudi Salmyah, S