Journal of Engineering & Processing Management (EPM)
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THE AGE-HARDENING MECHANISM OF Au585Ag90Cu264Zn61 GOLD ALLOY FOR JEWELRY PRODUCTION
No full textThe researches in this paper are conducted on Au585Ag90Cu264Zn61 gold alloy for jewelry production by plasic processing. Jewelry manufacturing, in contemporary goldsmith industry, beside modern design and great appearance, also demands great mechanical and technical and technological properties. In ternary alloys of Au-Ag-Cu system, structural changes happens, but not yet inestigated enough, both in alloys and in different stages of processing. In this paper, beside theoretical explanation of hardening mechanism by annealing on temperatures below the recrystallization temperatre that is by aging, the results obtained by annealing are also presented
EFFECT AIRCRAFT EXHAUST GASES ON SUM OF GREEN-HOUSE ATMOSPHERE GASES
No full textGlobal Warming Potential – GWP is an agreed quantity which enables determination of an individual green-house gas effect on a global warming process. GWP quantity illustrates how a unit mass of an observed gas contributes to increase of global warming more than an unique mass of CO2, during certain period of time. The paper shows gases and substances resulted from combustion of aircraft engine fuel , so as their affect to the atmosphere. The paper is a short view of an ecological aspect of aeronautics contibution to climate changes, as well as to results of green-house gas emission
ANALYSIS OF CHANGES IN THE PARAMETERS OF THE MATURATION OF SREMSKI SAUSAGE WITH PREVIOSLY GIVEN TEHNICAL CHARACTERISTICS OF THE CHAMBER
Full text linkSrem sausage belongs to the group of durable delicatessen products whose production is known since a long time ago. It is produced by selected recipe at precisely determined tehnical characteristics of the maturation chamber. The change of relative humidity, air temperature during the maturation and changes of pH values in the stuffing mass has been analyzed Also the difference in the mass of the Srem sausage has been determined at the begining and the end of maturation. The bacteriological state and organoleptic characteristics are examined.The processed data of changes are given in a tabular display
SULFIDE OXIDATION IN TANNERY WASTEWATER WITH H2O2
No full textHigh concentrations of sulfide in (cumulative) tannery wastewater are the direct cause of very high toxicity of this effluent. Therefore it is necessary to remove this pollutant by the oxidation process. Hydrogen-peroxide is the oxidizing agent, which increasingly acts as an "environment friendly" due to multiple uses for purification, detoxification and removal of odors from wastewater and waste gases. Wastewater treatment with H2O2 can be used as a separate procedure, or as an improvement of an existing mechanical or biological treatment processes. In conducted research, H2O2 was used for the oxidation of sulfide in samples of cumulative wastewater from processing of leather, after completion of gravitational sedimentation. The following parameters were varied: the concentration of H2O2, oxidation temperature and oxidation time. The achieved degree of oxidation of sulfide was 87,9-99,6 % at temperature t = 22 °C, with simultaneous reduction of COD values of 25-35 %. Verification of successful treatment of wastewater by hydrogen-peroxide was confirmed by toxicity tests on Daphnia magna. The results, expressed as 24-96hLC50, showed a significant decrease in toxicity, respectively treated wastewater was 100 times less toxic than the initial water samples
EXAMINATION OF AFLATOXINS IN MILK AND ACCURACY OF THE METHOD
Full text linkIn this study, we determined the accuracy Vicam method for the determination of aflatoxin B1 in feed and aflatoxin M1 in milk and dairy products by applying the method of standard addition. Analytical yield in all causes ranged from 93 to 95%, indicating a high accuracy of the method. The determination was made on aflatoxin B1 in (n = 20) samples of corn and adequately in milk and dairy products taken from animals that were fed the same corn. The samples are taken from small farms Pelagonia region. The results were in the normal range for corn and matches the reference value given approval for accreditation of laboratories in our country. For milk that was not sufficiently investigated field we get results that are in accordance with the Rules of the European Union, the aflatoxin M1 presence to 0.05 ppb. We conclude that the determination of aflatoxin B1 important, their presence in animal feed in order to avoid the presence of aflatoxin M1 in milk and dairy products, and it certainly depends on the season when the use of corn in the diet, time, storage temperature, etc
PEROXIDE TREATMENT IN EFFLORESCENCE PREVENTING
Full text linkEfflorescence is a crystalline deposit of water soluble salts on the surface of ceramic masonry. In most cases, efflorescence can be removed by various cleaning methods depending on the chemistry of the crystalline deposit. But this, sometimes, may even worse the problem. Therefore, it would be most desirable to minimize or to prevent the efflorescence through the proper selection of raw materials and by addition of appropriate admixtures and supplementary materials. Using clay with a high content of soluble salts, the aim of this experimental work was to evaluate the effect of H2O2 addition in efflorescence minimization. Some experiments are done using various concentrations of aqueous solutions of hydrogen peroxide. The oxidizing solutions are added to clay during various mixing times, prior to the forming stage. The content of the soluble salts in the fired clay specimens is evaluated qualitatively and quantitatively
INFLUENCE OF USED LUBRICANTS TO ENVIRONMENT
No full textIn the according with very intensive application of lubricant, the very large amounts of used lubricants which are harmful to the environment and human health are produced. In the European Union countries, the problem of used lubricants are permanently solved and many directives about this problem is setted (in the starting EEC Directive 75/439 and the end 2008/98/EC). In undeveloped countries similar with Bosnia and Herzegovina there is no organized management of used lubricants yet, because we do not have adequate legislation as well as the bad environmental awareness. In due to these facts used lubricants, although treated as hazardous waste are improperly disposed near roads, streams, fields, used for burning weeds, as a fuel, for impregnating wood, etc..). These effects can be dangerous for the environment and human health. Another problem is that these lubricants are mostly poorly degradable, and some of their components are not only toxic, but carcinogenic properties. In this paper, the method of disposal of used lubricants in the municipality of Zvornik is tested. The study was conducted by interview of institutions, public companies, private companies, craft stores and citizens, and collecting statistical data. In order to study used lubricants, analysis of water and soil from selected location (near roads, companies and auto repair shops) is performed
A THERMODYNAMIC ASPECTS OF METALLIC SECONDARY RAW MATERIALS RECYCLING POSSIBILITY
No full textIndustrial products are made from different materials, therefore existing metallurgical plants are not always able to adequately process them. Knowing the thermodynamic parameters, possibility and degree of removal of contamininats from the base metal in the recycling process can be predicted. Such approach facilitates a decisions about products design, selection of recycling technology, reduces contamination and increases the system resources. In addition, recycling process becomes more profitable, reducing energy costs and increasing environmental protection. In this way, the use of resources becomes more sustainable
INVESTIGATION OF THE EXTRACTION KINETICS OF MARIGOLD BY ETHANOL
No full textMarigold (Calendula officinalis L.) defined the particle size was extracted using 40, 50 and 60% ethanol as a solvent by classical procedure of maceration. The kinetics of extraction by given ethanol concentrations in relation to drug:solvent = 1:10 was studied. The quantity of total substances (q0, g/100g drugs), and the quantity of the residue substances which can be extracted from the drugs (qi , g/100g drugs) during the extraction were determined. On the basis of experimentally obtained values of qi , q0 and τ, coefficient of fast extraction (b*) and coefficient of slow extraction (k) were calculated. The obtained results show that by using 40% ethanol as solvent the coefficient of fast extraction has been the highest value. With using other two solvents the coefficient of fast extraction has been the same value. These results are in agreement with the theoretical assumption that the fastest solubility is achieved in the most polarity solvent
MEMBRANE PROCEDURES IN COMMUNAL WASTE LANDFILL LEACHATE TREATMENT
No full textOne of basic problems faced in practice of landfill waste treatment is a problem with landfill leachate. The intensity of their production, thus their quantity, depends on numerous factors: landfill age, waste types, microclimatic parameters and similar. This leachate must not be discharge directly into the environment without their previous collection and treatment. The water found in solid waste, as well as waters that infiltrate into the landfill form a medium that dissolves all soluble substances and causes the unreacted material move downwards, towards the landfill bottom. This water is known as leachate. Leachate chemical properties are influenced by biological disintegration of biodegradable organic matter, chemical oxidation processes and disintegration of organic and non-organic matters found in waste