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1.
INJECTION MOULDING PROCESS OPTIMIZATION OF CITRUS FIBER BIOCOMPOSITES BY SIMULATIONS AND TAGUCHI EXPERIMENTAL DESIGN
Peter Fajs, 2019, master's thesis

Abstract: The objective of the master thesis is to determine the filling properties of injection moulding process for newly created material, and to understand how the variation of processing parameters affects the flow possibilities. In thesis two materials were analysed, i.e. neat PLA material, which was used as a benchmark material and newly created composite CitrusPLA that is based on biodegradable PLA matrix and reinforced with citrus fibres. To fulfil the aim, the virtual and experimental design of experiment with the Taguchi methodology was conducted with use of spiral flow test, where the flow length of material through mould cavity was observed. The experimental results were the basis for the accuracy validation of numerical results and also to determine the optimum process parameters for injection moulding products with best flow conditions through statistical evaluation. It has been concluded that the newly created composite has lower viscosity compared to benchmark virgin PLA which results in better flow conditions in spiral flow test analysis. Both materials have the same optimal conditions in terms of flow conditions. The contribution of mould temperature is in both cases negligible. However, other two variated parameters i.e. melt temperature and injection speed have higher influence on filling characteristics for both materials.
Keywords: injection moulding optimization, material characterization, Moldflow, injection moulding simulations, Taguchi DOE, bio-composites, citrus waste fibres, PLA
Published: 07.06.2019; Views: 704; Downloads: 0

2.
Koncept Zero Waste v hotelu
Andreja Dremelj, 2018, bachelor thesis/paper

Abstract: Zaradi želje, da bi znižali negativen vpliv na okolje in poslovali racionalno in trajnostno smo se uprli na koncept Zero Waste. Po preučitvi obstoječega stanja smo preko smernic koncepta Zero Waste in primerov dobrih praks drugih hotelov raziskali, kako bi le te lahko vključili v naše delovanje in okolje.
Keywords: Zero Waste hoteli in restavracije, trajnostni – zeleni turizem, zmanjševanje količin odpadkov, zamenjava izdelkov za enkratno uporabo
Published: 19.11.2018; Views: 614; Downloads: 48
.pdf Full text (1,21 MB)

3.
Technological systems (TS) waste minimization, waste-free and environmentally friendly production
Manuela Ingaldi, Dorota Klimecka-Tatar, 2016, independent scientific component part or a chapter in a monograph

Keywords: technological systems, waste management, emission, pollution, companies
Published: 11.05.2018; Views: 975; Downloads: 61
.pdf Full text (772,32 KB)
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4.
Environmental management & audit 4: Environmental assessment - featured articles
2016, scientific monograph

Abstract: The present scientific monograph, entitled “Environmental management & audit“, is the result of three years’ work on an international project entitled “Environmental management in Russian companies – retraining courses for the sensibilization for and integration of Eco-Audit programs in corporate decision-making (RECOAUD)”. Within its more than 600 pages, the monograph features interesting texts written by 31 authors from the European Union and the Russian Federation, edited by dr. Borut Jereb, Darja Kukovič and dr. Daria Meyr. The monograph “Environmental management & audit“ is composed of four books: “Scarcity and Introduction of Environmental Management”, “Management Systems”, “Controlling and Stakeholders”, and “Environmental Assessment” (Featured Articles). These four topics reflect the complexity, heterogeneity and multidisciplinary of the project Tempus RECOAUD. The reader of the monograph gets a comprehensive overview of theoretical perspectives of environmental management and audit in the chosen areas. Furthermore, the monograph also highlights the results of research in the field of environmental management and audit as well as trends and challenges in the development of this field. Providing insight into theoretical and research findings, the monograph will prove useful to both practitioners and researchers in the field of environmental management and audit; it can also be used for study purposes.
Keywords: logistics, environment, climate change adaptation, sustainability, reverse logistics, life cycle assessment, environmental impact assessment, waste management, oil industry, gas industry, pollution
Published: 09.05.2018; Views: 818; Downloads: 83
.pdf Full text (5,51 MB)
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; This document is also a collection of 9 documents!

5.
3D-CO2-modelling for waste management in Styria/Austria
Wolfgang Fischer, Danko Simic, 2016, original scientific article

Abstract: The paper in hand focuses on a calculation model which had been developed for calculating the CO2 production of a garbage truck during a waste collection tour. The challenge is the integration of not only the distance and loading weight but also the different petrol consumption and therefore CO2 production in regard to the topography of the whole collection tour. Additionally the increase of waste load at each stop during the whole collection tour has to be taken into account for the calculation. The model has been developed on basis of Excel. In order to get the real data from the collection tours these had been accompanied. There not only the whole tour but also all waste bins and stops for loading the waste had been registered. Both GPS (Global Positioning System) and RFID (Radio-Frequency Identification) had been used. The huge amount of data had to be scrubbed. This process of amending or removing data in a database that is incorrect, incomplete, improperly formatted, or duplicated was an important step to have reliable data for further calculation processes. The identification of the CO2 production during a waste collection tour including the topography and continuous revenue load had not been done so far and allows the identification of tour segments with lower but mainly higher or very high ecological impact. However, this is the basis for further discussions about options for optimizing the actual tours and habits of waste collection. That approach is part of a more comprehensive investigation of waste collection tours with general focus on economic, ecologic and social potentials for optimization.
Keywords: waste management, CO2 production of trucks, Styria, Austria
Published: 17.04.2018; Views: 525; Downloads: 61
.pdf Full text (665,97 KB)
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6.
Synergistic chemo-enzymatic hydrolysis of poly (ethylene terephthalate) from textile waste
Felice Quartinello, Simona Vajnhandl, Julija Volmajer Valh, Thomas Farmer, Bojana Vončina, Aleksandra Lobnik, Enrique Herrero Acero, Alessandro Pellis, Georg M. Gübitz, 2017, original scientific article

Abstract: Due to the rising global environment protection awareness, recycling strategies that comply with the circular economy principles are needed. Polyesters are among the most used materials in the textile industry; therefore, achieving a complete poly(ethylene terephthalate) (PET) hydrolysis in an environmentally friendly way is a current challenge. In this work, a chemo-enzymatic treatment was developed to recover the PET building blocks, namely terephthalic acid (TA) and ethylene glycol. To monitor the monomer and oligomer content in solid samples, a Fourier-transformed Raman method was successfully developed. A shift of the free carboxylic groups (1632 cm$^{−1}$) of TA into the deprotonated state (1604 and 1398 cm$^{−1}$) was observed and bands at 1728 and 1398 cm$^{−1}$ were used to assess purity of TA after the chemo-enzymatic PET hydrolysis. The chemical treatment, performed under neutral conditions (T = 250 °C, P = 40 bar), led to conversion of PET into 85% TA and small oligomers. The latter were hydrolysed in a second step using the Humicola insolens cutinase (HiC) yielding 97% pure TA, therefore comparable with the commercial synthesis-grade TA (98%).
Keywords: textile waste, waste recycling
Published: 16.11.2017; Views: 850; Downloads: 271
.pdf Full text (304,48 KB)
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7.
Proceedings XI. international conference on logistics in agriculture 2017
2017, proceedings of peer-reviewed scientific conference contributions (domestic conferences)

Abstract: 11th International Conference of Logistics in Agriculture is a traditional conference in the field of logistics, which is very important in agriculture. The conference is organized by the Municipality of Sevnica, Grm Novo mesto – Centre of Biotechnics and Tourism, University of Maribor, Faculty of Logistics and Landscape Governance College. This year the topic of the conference is Short supply chain in Logistics in Agriculture. Our conference proceedings have several papers on different topics which are especially dealing with the distribution of locally produced food. This is one of the most important things for improving the tourism in the region. A part of this year’s conference is also a Round table on Challenges of plastics in agriculture.
Keywords: agriculture, logistics, locally produced food, waste, packaging
Published: 16.11.2017; Views: 1115; Downloads: 312
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8.
Kinetic studies of catalytic ozonation of atrazine
Brigita Tepuš, Marjana Simonič, 2008, original scientific article

Abstract: The aim of our work was to degrade atrazine by the ozone treatment of both a model and the original drinking water samples, using Pt-catalyst, and to evaluate the performance of this catalyst. The rate constant for the reaction of atrazine with ozone was determined in the model water sample. The activation energies and the reaction orders of ozone decomposition were determined in both the model and the drinking water samples. Ozone treatment using Pt-catalyst has some influence on the loss of atrazine in the sources of drinking water. The concentration of some metabolites in the model and drinking water was observed during ozone treatment. The toxicity of atrazine to crustacean Daphnia magna in the original drinking water and in the ozone treated water samples was also assessed.
Keywords: ozone, Pt-catalyst, atrazine, water treatment, waste water, kinetics
Published: 05.07.2017; Views: 559; Downloads: 68
.pdf Full text (185,82 KB)
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9.
Neutralization of waste filter dust with CO[sub]2
Ana Kračun, Ivan Anžel, Lidija Fras Zemljič, Andrej Stergaršek, 2015, professional article

Abstract: In this paper we report on the possibility of neutralizing filter dust from Talum Livarna d.o.o. The filter dust that remains after cleaning flue gas with the classification number of waste 10 10 09* is alkaline and contains heavy metals, non-metals, organic pollutants, and, therefore, has the properties of hazardous waste. The possibility of neutralizing this dust with CO2 was studied. The results showed that the treatment successfully lowered the pH value between the limits 6 and 9, which is within the legal constraints of pollution for strong acidic or alkaline waste. The contents of the hazardous substances were lowered, i.e., As, Cu, Ba, Zn, Cd, Cr, Ni, Pb, Sn, Mn and V, with percolation values that are below the level of the prescribed threshold-limit values for substances that allows their disposal in non-hazardous waste landfills. Only the percolation values of Sb, Cd, Mo and Se exceed the prescribed threshold limit values of substances that allow their disposal in inert waste landfills. The XRD analysis after the neutralization of the filter dust using CO2 showed no presence of CaO. The neutralized filter dust can be land filled as a stabilized and unreactive waste in landfills for nonhazardous wastes. Their properties also offer the possibility for incorporating them into some other material or product, such as the production of new composite materials, their use in construction products and perhaps cements or usage in backfills.
Keywords: hazardous waste, filter dust, neutralization, stabilization, chemical properties
Published: 17.03.2017; Views: 637; Downloads: 88
.pdf Full text (438,33 KB)
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10.
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