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Authors = Xenofon Spiliotis ORCID = 0000-0003-4574-9050

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12 pages, 1315 KiB  
Article
Environmental Assessment of Alternative Strategies for the Management of Construction and Demolition Waste: A Life Cycle Approach
by Georgios F. Banias, Christos Karkanias, Maria Batsioula, Lefteris D. Melas, Apostolos E. Malamakis, Dimitris Geroliolios, Stamatia Skoutida and Xenofon Spiliotis
Sustainability 2022, 14(15), 9674; https://doi.org/10.3390/su14159674 - 5 Aug 2022
Cited by 20 | Viewed by 4739
Abstract
The management of solid waste is currently seen as one of the most important concerns that national authorities, particularly in south Europe, must address. In recent years, emphasis has begun to be paid to Construction and Demolition Waste (CDW) being the largest waste [...] Read more.
The management of solid waste is currently seen as one of the most important concerns that national authorities, particularly in south Europe, must address. In recent years, emphasis has begun to be paid to Construction and Demolition Waste (CDW) being the largest waste stream in the European Union that is produced by renovation and repair work on buildings, roads, bridges, and other constructions made of bulky materials such as asphalt, bricks, wood, and plastic. Many EU countries responded quickly as a result of the large amounts of such waste and the presence of hazardous substances in their composition. This study illustrates the anticipated outcomes of several CDW management strategies other than final disposal, such as recycling, reuse, and incineration, for a public-school building in Greece. In order to assess how well the chosen schemes performed in terms of various environmental criteria, the SimaPro software suite and the Ecoinvent v.3 Life Cycle Inventory database were used. In order to enhance the quality of the outcomes, inventory data from earlier studies were also employed as input data for the Life Cycle Assessment tool. Full article
(This article belongs to the Special Issue Sustainability in Circular Bioeconomy)
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14 pages, 1504 KiB  
Article
Effect of Anaerobic Digestate on the Fatty Acid Profile and Biodiesel Properties of Chlorella sorokiniana Grown Heterotrophically
by George Papapolymerou, Athanasios Kokkalis, Dorothea Kasiteropoulou, Nikolaos Gougoulias, Anastasios Mpesios, Aikaterini Papadopoulou, Maria N. Metsoviti and Xenofon Spiliotis
Sustainability 2022, 14(1), 561; https://doi.org/10.3390/su14010561 - 5 Jan 2022
Cited by 3 | Viewed by 2595
Abstract
The growth kinetics and the lipid and protein content of the microalgal species Chlorella sorokiniana (CS) grown heterotrophically in growth media containing glycerol and increasing amounts of anaerobic digestate (AD) equal to 0%, 15%, 30%, and 50% was studied. The effect of the [...] Read more.
The growth kinetics and the lipid and protein content of the microalgal species Chlorella sorokiniana (CS) grown heterotrophically in growth media containing glycerol and increasing amounts of anaerobic digestate (AD) equal to 0%, 15%, 30%, and 50% was studied. The effect of the AD on the fatty acid (FA) distribution of the bio-oil extracted from the CS, as well as on the fatty acid methyl ester (FAME) properties such as the saponification number (SN), the iodine value (IV), the cetane number (CN), and the higher heating value (HHV) was also estimated. The percentage of AD in the growth medium affects the rate of carbon uptake. The maximum carbon uptake rate occurs at about 30% AD. Protein and lipid content ranged from 32.3–38.4% and 18.1–23.1%, respectively. Fatty acid distribution ranged from C10 to C26. In all AD percentages the predominant fatty acids were the medium chain FA C16 to C18 constituting up to about 89% of the total FA at 0% AD and 15% AD and up to about 54% of the total FA at 30% AD and 50% AD. With respect to unsaturation, monounsaturated FA (MUFA) were predominant, up to 56%, while significant percentages, up to about 38%, of saturated FA (SFA) were also produced. The SN, IV, CN, and HHV ranged from 198.5–208.3 mg KOH/g FA, 74.5–93.1 g I/100 g FAME, 52.7–56.1, and 39.7–40.0 MJ/kg, respectively. The results showed that with increasing AD percentage, the CN values tend to increase, while decrease in IV leads to biofuel with better ignition quality. Full article
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6 pages, 773 KiB  
Proceeding Paper
Valorization of Bottom Oil Sludge in Red Ceramics—Inertization of the Contained Heavy Metals in the Ceramic Matrix
by Xenofon Spiliotis, Dorothea Kasiteropoulou, Dimitra Kaffe, Dimitrios Christodoulou, George Banias and George Papapolymerou
Mater. Proc. 2021, 5(1), 6; https://doi.org/10.3390/materproc2021005006 - 28 Oct 2021
Viewed by 3058
Abstract
Among the wastes produced in a refinery are solids containing water, in particular: (i) bottom sludge accumulated in storage tanks and (ii) sludge agglomerated during the processing of crude oil. Potentially useful industrial secondary resources, co-processed with clays lead to the manufacturing of [...] Read more.
Among the wastes produced in a refinery are solids containing water, in particular: (i) bottom sludge accumulated in storage tanks and (ii) sludge agglomerated during the processing of crude oil. Potentially useful industrial secondary resources, co-processed with clays lead to the manufacturing of novel ceramic building products. Among the expected advantages, resulting to industrial symbiosis, is the inclusion of ashes and residual metals from the wastes within the ceramic structure, leading to the inertization of inorganic ingredients, through the thermal processing of clay to building ceramic products. Full article
(This article belongs to the Proceedings of International Conference on Raw Materials and Circular Economy)
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