Equilibrium Journal of Chemical Engineering
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Synthesis and Characterization of Novel Bi-Functional Catalyst from Mixture of Agro-Wastes Using Hydrothermal-Sulphonation Method
Get PDFAbstract. This research illustrates the development of a bi-functional catalyst derived from a blend of agricultural waste materials, employing a hydrothermal method. The precursor materials included cocoa pods, eggshells, snail shells, and orange peels. The resulting bi-functional catalyst underwent characterization through a variety of techniques, such as FTIR, XRF, XRD, SEM, TGA-DTA, and both single-point and multi-point BET analyses. The FTIR and XRD analyses distinctly indicated the transformation of calcium carbonate (CaCO3) from the agro-waste precursors into calcium oxide (CaO). XRD further validated the crystalline structures and identified the oxide minerals present within the catalyst using an X-ray diffractometer. The DTA-DSC curve displayed notable endothermic peaks at 400 °C, indicating a decomposition reaction that leads to the formation of a new compound. The surface area of the bi-functional catalyst was assessed using single-point and multi-point Brunauer-Emmett-Teller (BET) methods, yielding values of 87.94 m²/g and 159.4 m²/g, respectively. Additionally, the adsorption surface area of the catalyst's pore size was measured at 165 m²/g, while the Langmuir surface area was found to be 2792 m²/g, as determined by the Barrett-Joyner-Halenda (BJH) method. The mean pore volume was calculated to be 812.5 cc/g, and the average pore diameter was 2.138 nm, as established through BJH analysis. The diverse surface property results underscore the substantial influence of surface area on the catalyst's activity, as a larger surface area facilitates more efficient interactions between reactants and active sites. Consequently, the agricultural waste materials represent a promising source of calcium oxide for various applications across numerous scientific and engineering disciplines. Keywords: Bi-functional, Cocoa pods, Eggshells, Snailshells, Orange peels
Tenebrio molitor Larvae Feeding Strategy to Degrade Polypropylene Components from Disposable Masks
Get PDFThe surge in mask consumption during the COVID-19 pandemic led to the widespread use of disposable polypropylene masks for protection. However, the accumulation of used masks poses environmental challenges due to the slow degradation of polypropylene. Here, we investigate the potential of Tenebrio molitor larvae in degrading polypropylene masks, exploiting their synthetic polymer-breaking enzymes and associated microflora. In this study, we implemented various feeding strategies and established specific feed compositions to assess T. molitor larvae's consumption behavior towards polypropylene masks. Over a 21-day observation period, we noted a consumption rate of 0.4% of masks, with a 7.5% mortality rate among the larvae. The average daily consumption rate was 0.201 grams, resulting in a 2.3% increase in larval weight and the production of 0.4635 grams of feces. Our findings highlight the potential of T. molitor larvae as effective mask degraders. Optimizing cultivation conditions and feeding strategies may further enhance microbial diversity, potentially introducing more polypropylene degraders within T. molitor, thereby expediting mask degradation. This study emphasizes the promising role of T. molitor larvae in addressing the environmental challenges posed by the accumulation of polypropylene masks.Keywords: Mask, Degrade, Tenebrio molitor, Microflora, Polypropylen
Utilization of Tofu Liquid Waste as Liquid Organic Fertilizer Using the Fermentation Method with Activator Effective Microorganisms 4 (EM-4): A Review
Get PDFLiquid organic fertilizer is organic fertilizer in liquid form which is partly or wholly derived from organic compounds such as plant, animal and industrial residues, in solid or liquid form. The nutrients contained in it are in the form of a very fine solution so that it is easily absorbed by plants, even the leaves or stems. Organic fertilizer is one solution to restore soil minerals physically, chemically and biologically from the bad effects of synthetic fertilizers. Liquid fertilizer is obtained from a solid fermentation process first, then followed by a liquid anaerobic fermentation and extraction process. In the fermentation process, the role of microbes greatly determines the product produced. Tofu liquid waste is made from cooking residue from cooked soybeans boiled and the water from the remaining tofu tends to be thrown into the surrounding environment. Waste Liquid tofu contains organic ingredients, namely carbohydrates reaching 20-50%, protein 40-60%, and 10% fat. It is known that this tofu waste can be used as liquid organic fertilizer by fermentation. Tofu liquid waste contains organic substances, namely carbohydrates, proteins and fats, which can be used as liquid organic fertilizer. These substances must first be broken down into simpler elements by a fermentation process so that they can be absorbed by plants. Effective Microorganisms-4 as inoculants to increase microbial diversity in soil and can control unpleasant odors, accelerate the decomposition process, maximize the decomposition process, increase nutrient content, reduce the growth of pathogenic microorganisms, improve the physical, chemical and biological structure of the soil and bioremediation.Keywords: Liquid Organic Fertilizer, Liquid Waste, Fermentation, Effective Microorganisms-4, Nutrien
The Influence of Aqua Regia Usage in the Leaching and Extraction Process of Silica from Coal Fly Ash
Get PDFWaste from coal-burning power stations and other sectors that rely on coal as a source of energy is one of the environmental issues. Fly ash obtained from burning coal causes pollution in the surrounding environment. Subsequently, a great deal of study was conducted on the application of flying ash coal. Among the techniques for making use of the flying ash of coal is the extraction of silica. This study carried out silica leaching using Aqua Regia (a combination of HCl and HNO₃) with various ratios of 1:1, 1:3, and 3:1. The leaching process was carried out at varying temperatures of 30, 45, 60, 75, and 90 °C, with a leaching time of 1 and 2 hours. Precipitates containing silica were analyzed for their levels using XRF. The results of the study show that the ratio HCl:HNO₃ 3:1 is able to extract more silica than other solvent ratios.Keywords:Silica, Fly Ash, Leaching, HCl, HNO
Effectiveness of Activated Carbon from Jackfruit Skin for The Heavy Metal Lead (Pb) Adsorption Using The Langmuir and Freundlich Equations
Get PDFActivated carbon is a commonly used medium for adsorption to combat environmental pollution in both water and air. It is produced from plant or plantation waste containing carbon. Jackfruit skin, often considered as plantation waste, contains lignocellulosic compounds and has the potential to be used as active carbon. Activated carbon from jackfruit skin has a good absorption capacity and can absorb heavy metal waste such as lead (Pb). A recent study aimed to evaluate the absorption effectiveness of active carbon from jackfruit skin. The process involved making activated carbon using the pyrolysis method, and then analyzing its lead absorption capacity in lead nitrate solution by varying the weight of the activated carbon (10g, 15g, 20g, 25g, 30g) and the adsorption time in minutes (40, 60, 80, 100, 120). The levels of absorbed lead on activated carbon were tested using Atomic Absorption Spectrophotometry (AAS) at a wavelength of 283.3 nm. The research findings indicate that the effectiveness of activated carbon absorption reaches 99%, and the appropriate equation model for the adsorption process is the Freundlich isotherm, indicating a multilayer adsorption process.Keywords:Adsorption Isotherm, Activated Carbon Jackfruit Skin, Lead (Pb
Application of Subcritical Water Hydrolysis (SCW) in Producing Reducing Sugar for Biofuel Production
Get PDFAbstract. This work aimed to produce reducing sugar from coconut husk using subcritical water hydrolysis. Coconut husk contains cellulose and hemicellulose that can be converted into reducing sugars and then fermented into biofuel. In this study, the subcritical water hydrolysis was carried out in a batch reactor at temperatures 120-260 oC and pressures, 40, 80, and 160 bar for 1 h. Subcritical water method obtained two products, namely (a) liquid containing sugar and (b) solid containing cellulose, hemicellulose and lignin. The liquid sugars were analyzed by HPLC and DNS, while crystal structure was characterized by XRD and SEM. The highest yield of reducing sugar obtained was 0.25 g/g cellulose+ hemicellulose at 150 oC and 80 bar.Keywords: Biofuel, Coconut husk, Lignocellulose, Reducing sugar, Subcritical wate
Optimizing Bioky Performance Using Super Small Vessel in Wastewater Treatment Installation at PT. X in Klaten
Get PDFOne of the causes of environmental pollution is liquid waste generated by industries, especially the printing industry. PT Macanan Jaya Cemerlang is one of the printing industries producing liquid waste that does not meet the quality standards. The purpose of this research is to optimize the performance of Bioky bacteria using the Super Small Vessel in the wastewater treatment plant at PT X Klaten. Treatment involves testing variables such as residence time and bacteria quantity's impact on TSS, MBAS, COD, BOD, pH, and ORP.The study employs anaerobic treatment with observed variables: residence time of 1; 2; and 3 days, and bacteria quantity of 2.4; 3.2; and 4 liters. Samples from each variable are then analyzed for pH, ORP, and TSS. COD, BOD, and MBAS are tested after obtaining the best TSS results from each variable.The research results indicate that longer residence time and increased bacteria quantity lead to greater reduction in TSS, COD, BOD, and MBAS, while pH approaches neutrality. Optimal conditions occur at a 3-day residence time with 4,0 liters of bacteria, resulting in a reduction of TSS, COD, BOD, and MBAS against the inlet by 99.75%, 95.47%, 94.84%, and 26.72%. Although the treated waste doesn't meet the established standards, it effectively reduces the pollution levels in PT X's wastewater. Keywords:Anaerobic, Efficiency, Printing Industry Liquid Waste, Super Small Vesse
The Effect of HCl Activator on PET Adsorbent to Reduce Phosphate Content in Laundry Waste
Get PDFPlastic waste is waste that cannot be decomposed so it will cause serious problems to the environment. The National Waste Management Information System (SIPSN) reported that in 2020 plastic waste was found to be 17.2% of the total waste collected. Several types of plastic can become porous charcoal through the heating process in a furnace so that it can be used as an adsorbent for liquid waste from the laundry industry. Laundry liquid waste containing excess phosphate will disrupt the environment such as eutrophication. This research aims to determine the effect of the HCl activator on carbon from polyethylene terephthalate (PET) plastic bottle waste to reduce phosphate levels in liquid laundry waste. This research uses varying concentrations of HCl as a carbon activator, namely 1M, 5M, and 10M. The activated carbon is added to the liquid laundry waste and stirred at a speed of 100 rpm. Phosphate content analysis was carried out using a spectrophotometer in liquid laundry waste before and after the adsorption process and BET (Brunauer-Emmet-Teller) analysis on activated carbon with activator HCl 10 M. The greatest decrease in phosphate levels was 10 M HCl concentration of 52.87%, with a carbon surface area of 203.1222 m²/g and a particle size of 29.53 nm. The adsorption capacity of activated carbon with a 10 M activator is 0.1499 mg/g. Keywords:PET, Adsorbent, HCl, Laundry Waste, Phosphate
Glucose Syrup from Purple Sweet Potatoes (Ipomoea batatas L. Poir) using Acid Hydrolysis Method
Get PDFAbstract. The making of glucose syrup from purple sweet potatoes is motivated by the high demand for alternative sugar in Indonesia. Through the processes that have been carried out and the results of previous studies, the potential of purple sweet potatoes to be processed into glucose syrup has been produced. This experiment was conducted to determine whether purple sweet potatoes can be processed into glucose syrup and to determine the suitability of the product to the standard. To convert purple sweet potatoes into glucose syrup, it is necessary to first extract the starch content in purple sweet potatoes and go through the process of making glucose syrup by the acid hydrolysis method using citric acid of various concentrations (0.2, 0.4, 0.6, 1 N). For the feasibility of consuming glucose syrup from purple sweet potatoes, a toxicity test was carried out using the Brine Shrimp Lethality Test (BSLT) method. Tests were also carried out on water, ash, reducing sugar, and starch content to then be compared with the Indonesian glucose syrup standard (SNI 01-2978-1992). The results showed that the reducing sugar content of purple sweet potato glucose syrup followed the glucose syrup quality standard, which was 43.31%, the lowest water content was 18.35%, the lowest ash content was 7.95% and there was no starch content in purple sweet potato liquid sugar. The aroma of the glucose syrup produced was following the Indonesian National Standard, but the color and taste produced were not yet in accordance. The toxicity test of purple sweet potato liquid sugar showed a lethal concentration value of LC50 >1,000 ppm, which means that purple sweet potato liquid sugar has no toxic potential so it is safe for consumption.Keywords:Purple Sweet Potatoes, Liquid Sugar, Acid Hydrolysi
Green Energy from Palm Kernel Shell Gasification – dual fuel engine performance analysis
Get PDFElectricity generation in Indonesia is mainly generated from non-renewable fuels. Based on these problems, this research utilizes palm kernel shells to be converted into producer gas as secondary fuel for a 5 kW diesel engine. Through a gasification process equipped with a cooling and gas cleaning system, low tar gas is fed to the diesel engine with variations of gas flow rate ratio to combustion air. A dummy load is installed to investigate the effect of load on diesel consumption. The diesel engine vibration increases due to using two fuel types was measured by installing a vibration meter. The research results show that the higher the load and the greater the ratio of producer gas injected, the less diesel consumption. At a gas ratio of 4:1 and an increase of load from 1 to 5 kW, the diesel fuel flow rate reduces by 25 - 31%. The most significant reduction in diesel consumption occurred at a load of 5 kW, valued at 38.49%. On the other hand, increasing the gas ratio causes an increase in diesel engine vibration. The research results showed an increase in engine vibration of 5.84% - 10.25%. The largest vibration was recorded at a load of 5 kW with a value of 92.4 m/s².Keywords:Gasification, Palm Kernel Shell, Dual Fuel Engine, Diesel Consumption, Diesel Engine Vibratio