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Improving decentralized economic growth and reducing energy consumption in the European Union with the application of ecologically oriented innovations
Niko Natek, Boštjan Krajnc, 2020, strokovni članek

Opis: This article presents applicable approaches for supporting the transition towards sustainable decentralized economic development within the European Union, based on the concept of supporting the development and market uptake of eco-innovations. The main topic addressed is achieving a more effective market uptake of ecologically oriented innovations facilitated through matchmaking, as well as knowledge and technology transfer between key actors of the innovation process.
Ključne besede: Energy efficiency, Ecology, Innovation, Economy, waste-water treatment, constructed wetlands, green-house gas emissions, EU
Objavljeno v DKUM: 15.11.2023; Ogledov: 208; Prenosov: 4
.pdf Celotno besedilo (803,56 KB)
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Kinetics study of hydrothermal degradation of PET waste into useful products
Maja Čolnik, Darja Pečar, Željko Knez, Andreja Goršek, Mojca Škerget, 2022, izvirni znanstveni članek

Opis: Kinetics of hydrothermal degradation of colorless polyethylene terephthalate (PET) waste was studied at two temperatures (300 °C and 350 °C) and reaction times from 1 to 240 min. PET waste was decomposed in subcritical water (SubCW) by hydrolysis to terephthalic acid (TPA) and ethylene glycol (EG) as the main products. This was followed by further degradation of TPA to benzoic acid by decarboxylation and degradation of EG to acetaldehyde by a dehydration reaction. Furthermore, by-products such as isophthalic acid (IPA) and 1,4-dioxane were also detected in the reaction mixture. Taking into account these most represented products, a simplified kinetic model describing the degradation of PET has been developed, considering irreversible consecutive reactions that take place as parallel in reaction mixture. The reaction rate constants (k1–k6) for the individual reactions were calculated and it was observed that all reactions follow first-order kinetics.
Ključne besede: PET waste, subcritical water, kinetics, degradation, TPA
Objavljeno v DKUM: 18.09.2023; Ogledov: 419; Prenosov: 16
.pdf Celotno besedilo (2,22 MB)
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Degradation of polyvinyl chloride (PVC) waste with supercritical water
Maja Čolnik, Petra Kotnik, Željko Knez, Mojca Škerget, 2022, izvirni znanstveni članek

Opis: The chemical degradation of PVC waste in SCW between 400 and 425 °C and reaction times from 30 to 60 min was studied. The PVC waste in SCW decomposed into the gas, oil, water soluble, and solid phases. The highest yield of the gas and oil phases was achieved at the temperature of 425 °C after 60 min. By increasing the reaction time at 400 °C, the yield of chloride ions in the aqueous phase increased and reached the maximum at 60 min. The gas and oil phases contained many valuable compounds similar to crude oil. Alkanes and chloroalkanes; alkenes, alicyclic, and aromatic hydrocarbons; as well as alcohols were the main groups of hydrocarbons in the oil phase, while the gas phase contained only light hydrocarbons (C1–C6), CO2, and small amounts of H2. This confirmed that the largest chlorine content remains in the aqueous phase and does not pass into the gas phase. It can be concluded that SCW presents effective decomposition media for plastic waste.
Ključne besede: polyvinyl chloride, supercritical water, chemical recycling, plastic waste
Objavljeno v DKUM: 18.09.2023; Ogledov: 319; Prenosov: 16
.pdf Celotno besedilo (1,09 MB)
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Chemical recycling of polyolefins waste materials using supercritical water
Maja Čolnik, Petra Kotnik, Željko Knez, Mojca Škerget, 2022, izvirni znanstveni članek

Opis: In the following work, the hydrothermal degradation of polypropylene waste (PP) using supercritical water (SCW) has been studied. The procedure was carried out in a high-pressure, high-temperature batch reactor at 425 °C and 450 °C from 15 to 240 min. The results show a high yield of the oil (up to 95%) and gas (up to 20%) phases. The gained oil phase was composed of alkanes, alkenes, cycloalkanes, aromatic hydrocarbons, and alcohols. Alkanes and alcohols predominated at 425 °C and shorter reaction times, while the content of aromatic hydrocarbons sharply increased at higher temperatures and times. The higher heating values (HHVs) of oil phases were in the range of liquid fuel (diesel, gasoline, crude and fuel oil), and they were between 48 and 42 MJ/kg. The gas phase contained light hydrocarbons (C1–C6), where propane was the most represented component. The results for PP degradation obtained in the present work were compared to the results of SCW degradation of colored PE waste, and the potential degradation mechanism of polyolefins waste in SCW is proposed. The results allowed to conclude that SCW processing technology represents a promising and eco-friendly tool for the liquefaction of polyolefin (PE and PP) waste into oil with a high conversion rate.
Ključne besede: polypropylene, polyolefins, supercritical water, plastics waste, chemical recycling
Objavljeno v DKUM: 18.09.2023; Ogledov: 378; Prenosov: 14
.pdf Celotno besedilo (3,44 MB)
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Kinetic studies of catalytic ozonation of atrazine
Brigita Tepuš, Marjana Simonič, 2008, izvirni znanstveni članek

Opis: 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.
Ključne besede: ozone, Pt-catalyst, atrazine, water treatment, waste water, kinetics
Objavljeno v DKUM: 05.07.2017; Ogledov: 1174; Prenosov: 82
.pdf Celotno besedilo (185,82 KB)
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Application of cyclodextrins in textile dyeing
Bojana Vončina, 2011, samostojni znanstveni sestavek ali poglavje v monografski publikaciji

Ključne besede: textile dyeing, cyclodextrins, dyeing auxiliaries, polyfunctionalization, textile waste water
Objavljeno v DKUM: 01.06.2012; Ogledov: 1648; Prenosov: 92
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FP7 EU project AquaFit4Use - synergy of 4 industrial sectors with the goal of waste water recycling
Alenka Majcen Le Marechal, Simona Vajnhandl, Darko Golob, 2009, strokovni članek

Opis: Sustainable water use in industry is the goal of AquaFit4Use, by a cross-sectorial, integrated approach. The overall objectives are: the development and implementation of new, reliable, cost-effective technologies, tools and methods for sustainable water supply, use and discharge in the main water consuming industries in order to significantly reduce water use, mitigate environmental impact and produce and apply water qualities in accordance with industrial own specifications (fit - for - use) from all possible sources, and contributing to a far-going closure of the water cycle in a economical, sustainable and safe way while improving their product quality and process stability.
Ključne besede: waste water recycling, reduce water use, water quality, sustainable water supply
Objavljeno v DKUM: 31.05.2012; Ogledov: 2519; Prenosov: 33
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