Abstract— To reuse treated wastewater, water quality must be improved. Adsorption is a simple, cost-effective method for eliminating toxicities and poisnous anions. The adsorbent's features and properties determine the method's effectiveness. This research examines the adsorption of carbonate and sulphate anions onto plantain peels modified with 2-amino-4,6-dihydridoxypyrimidine. Characterization was done using SEM, XRD, and FTIR. UV-visible spectroscopy was used to measure initial and equilibrium concentrations, and Langmuir and Fremdliuch isotherms were used to analyze the data. The best parameters for adsorbing 150 mg/L CO32- and SO42- were: pH 2, and 4, 0.8 g adsorbent, 120 min contact time, and 330 K temperature. Kinetic study used pseudo-first-order reaction equations, and both ion uptake processes followed pseudo-first-order rate expression. ΔG (-3.772 kJ/mol) for CO32- and ΔG (-3.047 kJ/mol) for SO42- were negative, and ΔH (-22.04 kJ/mol) and (-39.92 kJ/mol) were also negative, indicating the adsorption process was feasible, spontaneous, and exothermic. Modified plantain peels had high adsorptivity and were a cost-effective adsorbent for CO32- and SO42- from aqueous solutions.
2. Research into the Possibility of Regenerating Silica Gel using Vacuum
Abstract— Gases used in industry must meet the required technological parameters for the production process, such as the content of gaseous impurities, moisture content and mechanical impurities. Their presence has a significant limiting effect for their further use in technical practice. One of the effective methods of removing moisture from gas is its adsorption, in which the gas passes through a bed of adsorbent, which subsequently binds this moisture on its surface. The article deals with the regeneration of this adsorbent, as it is advantageous from an economic point of view if it is possible to use this adsorbent repeatedly in the gas drying process. By reusing the adsorbent, there is an overall reduction in the cost of operating the equipment and the ecological burden caused by the production of a new adsorbent. The article primarily discusses the influence of the temperature of the dried medium on the speed of its regeneration using vacuum.
3. Structural Design of Atypical Metal hydride Tank and Investigation of Generated Temperature Fields: Part I
Abstract— The article describes the structural design of an atypical metal hydride storage tank for hydrogen storage for mobile operations such as cars, buses, etc. The structural design of the tank consists of three main parts, namely an atypical bottom of an elliptical shape with a flange on which there is a 1/4NPT” thread, three seamless pipes and a second atypical bottom as a cap. Hydrogen storage works under low pressure of up to 30 bars and is based on TiFe alloys. In the next part, the article deals with the investigation of the temperature fields created in an atypical metal hydride tank, and then it is devoted to an effective method of cooling the metal hydride tank during the process of hydrogen absorption into the structure of the metal alloy.
4. Gas Transmission System Optimization with Natural Gas Transportation
Abstract— In connection with the heated political situation to the east of the European Union (EU) borders, there is a growing interest in the discovery of new reserves of natural gas or new suppliers of this fossil fuel. This situation consequently requires new and unconventional ways of solving the storage and transportation of gas in large quantities and over long distances. The following article discusses the methods of storage and transportation of natural gas through the gas network.
5. Design of A Model of Liquid Feeder to an Incinerator of Hazardous Waste and its Optimization from the Cooling Point of View: Part I
Authors: Ivan Mihálik, Marián Lázár, Tomáš Brestovič
Abstract— A series of articles aimed at the cooling of the liquid radioactive waste feeder into the incinerator space optimization. The first part of the article offers a theoretical analysis of radioactive waste and the possibilities of its incineration. It also deals with the heat transfer within the waste feeder by means of the criterion equations for the transverse flow around the pipe at an angle, thanks to which the required mass flow of the cooling medium is determined.
6. Design of An Experimental Device for the Analysis of the Influence of Sound Waves on the CPU Cooling Process - Part I
Abstract— The article discusses the design and preparation of the experimental equipment for the analysis of the cooling power of air cooling at various operating parameters. The basis of the article is an analysis of the needs and maximum thermal output of the CPU. Subsequently, it presents the design of the experiment with the calibration requirements. It describes processes for creating a basic package of data as an initial point for experimental analysis and solving the problem of increasing the air-cooling efficiency using acoustic waves.
7. Device for Researching the Cooling Intensity of Flowing Media
Authors: Mária Čarnogurská, Miroslav Příhoda, Tomáš Brestovič
Abstract— The article describes the construction of a device for researching the effect of air flow speed on the intensity of cooling of the medium that flows in the ribbed tubes of the cooler. The measure of cooling intensity is the overall heat transfer coefficient k. It is a model of a tubular heat exchanger in which horizontal and vertical movement of the individual tubes of the heat exchange surface is possible. The device will be used to obtain information about the influence of the arrangement of the heat exchange surface on the cooling performance of the exchanger. The measured values of the relevant quantities will be used as input data for the ANSYS CFX software. The software will allow to simulate the current ratios in the radiator tubes, the temperature fields along the length of the tubes and in the individual tubes of the exchanger arranged according to its height.
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Agriculture Journal IJOEAR
International Journal of Environmental and Agriculture Research