Journal of Engineering & Processing Management (EPM)
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EFECTS OF CHEMICAL COMPOSITION ON THE MICROSTRUCTURE AND PROPERTIES OF THE CU-Ge-Sb ALLOYS
Full text linkIn the current study a ternary Cu-Ge-Sb system has been experimentally assessed. Chemical and phase compositions of the alloy samples from three vertical sections Cu-GeSb, Ge-CuSb and SbCuGe were studied using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) and confirmed by X-ray diffraction analysis (XRD). Hardness of the alloys was measured by Brinell method while hardness of phases was measured using micro Vickers method. Electrical conductivity of the studied alloys was measured using eddy current instrument. Based on experimentally determined values iso-lines of hardness and electrical conductivity for the whole ternary system were calculated using assumed mathematical models
ADSORPTION OF METHYLENE BLUE DYE ON ACTIVATED CARBON OBTAINED FROM THE FRUIT OF PLANE TREES
No full textThe fruit of plane trees is used to obtain the powdered activated carbon. As the activating agent is used in the preparation of concentrated phosphoric acid. Completed the equilibrium adsorption of cationic methylene blue dye in the synthesized material. These results were fitted with three adsorption equilibrium model. The experimental results were analyzed by the Langmuir isotherm, Freundlich isotherm in the Temkin isotherm. The best fit of the experimental results with theoretical models is obtained in the case of Langmuir's equilibrium models. According to the Langmuir model, achieved the best adsorption capacity of the adsorbent color which is 354.60 mg g-1 when activated carbon treated with NaOH
QUALITY OF WASTE WATER AND POLLUTED AIR GALVANIC-CHEMICAL PROCESSES
No full textThe process of galvanic-chemical protection according to the qualitative and quantitative characteristics, is one of the most complex wastewater pollutants. Also, from the surfaces of industrial solutions, as well as the protected parts of the stages of care, there are significant fumes, which pollute the surrounding air, which is to be treated prior to discharge into the environment. Depending the way they emerged, wastewater contains: the free acids and bases; specific contaminants: cyanide, chromium and nitrate and dissolved heavy metals: Fe, Cd, Ni, Cu, Zn, Ag, etc. Polluted air is full with mixed vapors of acids and bases, as well as the specific chromium and cyanide vapors. The paper shows the procedures, as well as, mechanisms of treatment of wastewater and poluted air generated in the process of galvanicchemical protection in the collective of "Orao" JSC for production and overhaul Bijeljina. The results obtained were compared with the values prescribed by regulations in the Republic of Srpska in the field of waste water and emissions of air pollutants
MANAGEMENT OF CHEMICAL AND MICROBIOLOGICAL WATER QUALITY IN POOLS FOR SWIMMING AND RECREATION
No full textUse of water for recreation or treatment of very it’s very important to maintain health and working capacity of the population. A significant number of people temporarily or permanently, used pools for that purpose. That is why today, in the developed countries, great attention is paid to the quality of water for recreation. The aim of this work is to manage pools in terms of managing chemical and microbiological quality of water. Consideration of the problem of managing chemical microbiological quality of water in swimming pools is based on the relevant Recommendations of the World Health Organization. Retrospective-descriptive method is used to analyze the results of laboratory tests of swimming pool water in the city of Banja Luka in 2013 and 2014. Results of the analysis showed that the physical and chemical inadequacy of water is mainly related to increased chloride content in water, while microbiologically defectives are caused by the increased number of coliform bacteria
ANANALYTICAL STUDY OF MARBLE CONSOLIDATION BY OXALATE PRECIPITATION USING DENSITY, FTIR AND POWDER-XRD MEASUREMENTS
Full text linkOur recent study on consolidation of marble samples with the purpose of culture heritage protection occurred by periodical calcium oxalate precipitation on top of quasi parallelepipedic samples. The overall process consisting of three stages of treatment, starting with 5 % calcium acetate solution for 60 minutes at 20°C, a draining step at 70°C for 30 min, followed by a treatment with 5 % ammonium sulfate solution, it followed with the third stage which includes the treatment with 5% ammonium oxalate solution revealed a continuous density increace, determined using ethanol. As the natural samples had an initial density of 2.5871 g/cm3 , it increased up to 2.6980 g/cm3 for 50 times treatments. The precipitation of oxalate on top of calcium carbonate substrate, in form of calcite, revealed two distinguished infra-red bands, at 1316 cm-1 and 1624 cm-1 unsymmetrically located around the carbonate one at 1426 cm-1 .The intensity of the bands was proportional to the number of treatments. The continuous surface coverage investigated in parallel by powder XRD evidenced the presence of whewellite crystallites deposited on top of calcite, and their intensity increasing as well with the number of treatments. This method exhibits a reliable oxalate coverage of marble sample surfaces which doesn’t influence considerably their water solubility
PRODUCTION OF GLASS-CERAMICS FROM WASTE MATERIALS AND OPTIMIZATION OF THE MAIN PROCESS PARAMETERS
Full text linkIn this study the 3D surface model was successfully applied in investigating the influence of the process parameters on the physical and mechanical properties of the glass-ceramics. Glassceramics was produced from coal fly ash and waste glass through the sintering method. The raw material was taken from “REK Bitola”, a thermal power plant in the Republic of Macedonia. Glass-ceramics was obtained through the process of consolidation. Compacts with different ratio of fly ash and waste glass were pressed at 45 MPa, sintered in the temperature interval from 1000 to 11000C, and isothermal time at the final temperature from 1h to 5h. The process of optimization was conducted on the process parameters such as quantity of glass, sintering temperature and isothermal time. According to the results of the process of optimization presented by the software package, a final model equations of the density and bending strength dependence were obtained
SHORT OVERVIEW OF ENCAPSULATION TECHNOLOGIES FOR DELIVERY OF BIOACTIVES TO FOOD
Full text linkEncapsulation strategy has emerged as a mean to protect sensitive bioactive compounds, to improve their stability and to deliver their active forms to the targeted place. A number of bioactives can be encapsulated – cells, enzymes, vitamins, minerals, aromas and flavours, food colourants, antioxidants, etc. Over the years various encapsulation technologies were employed in encapsulation of bioactive compounds intended to the application in food industry. This paper gives a short overview of commonly used technologies for the encapsulation of food bioactives
NEW APPROACH TO DETERMINING OF COMPRESSED AIR TANK MINIMAL VOLUME
No full textBased on relations for the maximum work at the closed thermodynamic system, the paper presents implementation of a general model for determining the minimum storage volume for compressed air. Due to the mechanical and thermodynamic imbalance of observed model, there are the conditions for obtaining the maximum work. Derived relations, which represent a new model, can be directly used in technical practice for the case that are known parameters that define the initial state in the reservoir, the parameters of the environment, and energy to get from the compressed air. For a complete presentation of the reporting process, it is presented in the working p-v and thermal T-s diagram. In addition to the screening, the paper presents and graphic design of the problem, which can also be used to control of the results. Also, it is illustrated the application of the model on a practical case, where a certain minimum volume of the storage tank filled with air
DETERMINATION OF STEAM-BOILER PIPES FILTHINESS IN THERMAL POWER PLANTS
No full textA reliable operation of the equipment is primarily important for each installation. One of the measures of safe operation steam-boiler systems is purity pipes. Very acceptable method of determining the soiling pipe is a method of staining.In this paper is described the determination of soiling boiler tubes in power plant Ugljevik after a decade of operation of the plant
MATERIAL AND ENERGY FLOW MANAGEMENT- LIFELONG LEARNING COURSES EXPERIENCES
Full text linkMaterial and energy flow management is among the most important factors for the economic growth of a society in harmony with nature and it will play the main role only in the area of sustainable development. The three lifelong learning courses were developed in order to introduce this concept to the industry professionals and administration at the city and regional level. The main goal was to heighten awareness of participants to this topic, as in Serbia it is relatively new approach in corporate and administrative management. The results of the courses confirmed the interest in this kind of lifelong learning courses with suggestion to join it in a single course with emphasise on the specific participant’s problems