Environmental Pollution From Waste And Biomass Energy Generation

In the sectors of waste and biomass to energy, some debatable paradigms persist both among the specialists and among the population, concerning the performances of a few energy options. The present article wants to give a contribution to clarify the debate related to three cases: (a) local impact of waste to energy plants, from conventional solutions to innovative ones (thermochemical processes); (b) local impact of Solid Recovered Fuel generation before energy exploitation; (c) local impact of combustion of wood. Three key articles have been selected from the Author’s production (more than one hundred Scopus indexed works) in order to perform a deeper analysis. Results demonstrate that, changing the perspective, some paradigms on the environmental performances of a few waste and biomass options for energy generation must be at least modified

COVID-19 and municipal solid waste management

The present work analyses the scientific literature available on the impact of the SARS-CoV-2 in the sector of municipal solid waste. After a bibliometric analysis based on data taken from Scopus®, the analysis deals with effects on waste composition, waste quantity, collection, and treatment. As expected, results show that the most productive authors on this topic belong to scientific bodies located in the countries more affected from COVID-19 in the world. Moreover, different strategies of international journals resulted in an unbalanced concentration of papers on this topic. Effects have been observed concerning municipal solid waste composition and amount (mostly for the role of masks and packaging). Impacts on management and circular economy are discussed too

Uncovering Productivity Growth in the Disaggregate: Indonesia's Dueling Agricultural Sub-Sectors

The success of seed-fertilizer technologies and government subsidies in attaining nearly self-sufficient rice production in the mid-1980s encouraged the Indonesian government soon afterward to shift resources away from food crops and toward export-oriented crops. These shifts were reinforced by trade liberalization and a sharp devaluation of the rupiah after the 1997 Asian financial crisis, which exerted Indonesia’s comparative advantage in tropical perennial products. In the present paper, we ask whether such events have altered Indonesia’s agricultural growth strategy from a food-crop to an export-crop one. With an innovative multi-output stochastic distance frontier model and provincial production and policy-related data from 1985 to 2005, we estimate technology growth by agricultural subsector and efficiency improvement by political jurisdiction. The perennial-crop sector is found to have achieved the highest technology growth rate, followed by the livestock and annual-crop sectors. We find overall productivity growth to have been moderate, and suggest that little of it can be attributed to Indonesia’s public research efforts.agricultural research, Indonesia, Shephard distance function, stochastic frontier, technical change, technical efficiency, International Development, Productivity Analysis, Research and Development/Tech Change/Emerging Technologies,

Oscillatory subglacial drainage in the absence of surface melt

The presence of strong diurnal cycling in basal water pressure records obtained during the melt season is well established for many glaciers. The behaviour of the drainage system outside the melt season is less well understood. Here we present borehole observations from a surge-type valley glacier in the St Elias Mountains, Yukon Territory, Canada. Our data indicate the onset of strongly correlated multi-day oscillations in water pressure in multiple boreholes straddling a main drainage axis, starting several weeks after the disappearance of a dominant diurnal mode in August 2011 and persisting until at least January 2012, when multiple data loggers suffered power failure. Jökulhlaups provide a template for understanding spontaneous water pressure oscillations not driven by external supply variability. Using a subglacial drainage model, we show that water pressure oscillations can also be driven on a much smaller scale by the interaction between conduit growth and distributed water storage in smaller water pockets, basal crevasses and moulins, and that oscillations can be triggered when water supply drops below a critical value. We suggest this in combination with a steady background supply of water from ground water or englacial drainage as a possible explanation for the observed wintertime pressure oscillations

Improving the approach to efficiency assessment of investment projects in the energy sector

According to the annual world statistics, primary energy consumption demonstrated a steady growth over the past decade but in 2018, its average value was doubled. A rapid development of energy sector will not only lead to the growth of CO2 emissions and other negative consequences, but also to more intensive use of natural resources in the immediate future. Growing pressure on resources might give rise to a number of challenges in virtually all branches of human activity. The energy sector\u2019s impact on the environment is increasing at a high speed, which necessitates the efficiency assessment of investments in energy projects applying a system of technical, economic and environmental indicators. Nowadays, most of the energy projects comprise eco-friendly technological solutions that significantly decrease the use of natural resources but at the same time they might affect financial costs that dampen the attractiveness of investment projects at all. Despite that fact, the economic and environmental evaluation allows identifying the total exposure of the project in the long term and aids in measuring its multiplier effect on the region economy as lots of energy projects have a considerable innovative potential. The present study provides a system of environmental indicators that improves the efficiency assessment process of investment projects in the energy sector

Students' attitudes towards nuclear energy: Russian and Italian experience

Nowadays, the energy sector faces a lot of challenges because of environmental issues, the potential depletion of fossil fuels in the future, problems of technological development, etc. Despite the fact that alternative energy is a key factor of the energy sector's development, it still has several controversial questions, and one of them is "to what extent is nuclear energy safe for the world?" As a consequence, public acceptability has a role to play as it significantly affects the way nuclear energy should be developed in the next decades. In this paper, we provide the main results of the research made in December 2018 in Italy and Russia on students' attitude towards nuclear energy and its development in their homelands. The research method is a questionnaire which was carried out at the University of Trento, Italy, and at Ural Federal University, Russia. According to the given results, most of the students from both countries do not have a negative perception of nuclear energy. However, the opinions on its development in Italy and Russia are completely different: Russian students support the government's energy program in which nuclear energy is one of the most promising trends for the future, whereas Italian students do not accept the possibility that nuclear energy could come back into the Italian energy sector

Growth of bifidobacteria in mammalian milk

Microbial colonization of the mammalian intestine begins at birth, when from a sterile state a newborn infant is exposed to an external environment rich in various bacterial species. An important group of intestinal bacteria comprises bifidobacteria. Bifidobacteria represent major intestinal microbiota during the breast-feeding period. Animal milk contains all crucial nutrients for babies’ intestinal microflora. The aim of our work was to test the influence of different mammalian milk on the growth of bifidobacteria. The growth of seven strains of bifidobacteria in human milk, the colostrum of swine, cow’s milk, sheep’s milk, and rabbit’s milk was tested. Good growth accompanied by the production of lactic acid was observed not only in human milk, but also in the other kinds of milk in all three strains of Bifidobacterium bifidum of different origin. Human milk selectively supported the production of lactic acid of human bifidobacterial isolates, especially the Bifidobacterium bifidum species. The promotion of bifidobacteria by milk is species-specific. Human milk contains a key factor for the growth of specific species or strains of human-origin bifidobacteria compared to other kinds of milk. In contrast, some components (maybe lysozyme) of human milk inhibited the growth of Bifidobacterium animalis. Animal-origin strains of bifidobacteria were not able to significantly grow even in milk of animal origin, with the exception of B. animalis subsp. lactis 1,2, which slightly grew in sheep’s milk

Evaluation of key aggregate parameters on the properties of ordinary and high strength concretes

[EN] This paper reports the results of a study conducted to determine the influence of coarse aggregate type on the workability, compressive strength, and flexural strength of normal and high strength concretes with target 28-day compressive strengths of 30 and 60 MPa and two water/cement ratios of 0.44 and 0.27. The concretes were prepared using four types of natural coarse aggregates, namely diabase, calcareous, river gravel, and basalt, with maximum particle sizes of 12.7 and 19.1 millimeters. Silica fume was added to the high-strength concretes at a replacement ratio to Portland cement of 10% by mass. The results showed that among all aggregates, basaltic aggregate with a maximum particle size of 12.7 millimeters produced concrete with the highest compressive and flexural strength, followed by limestone and river aggregate, indicating that particle size, surface texture, structure and mineralogical composition play a dominant role in the behavior of concretes, especially high strength concretes. Normal strength concretes showed similar compressive strengths, while the concrete containing limestone gave slightly higher strength. These results show that for a given water/cementitious material ratio, the influence of the type of coarse aggregate on the compressive strength of the concrete is more important for high strength concrete than for normal strength concrete.Salas-Montoya, A.; Mira-Rada, BE. (2023). Evaluation of key aggregate parameters on the properties of ordinary and high strength concretes. VITRUVIO - International Journal of Architectural Technology and Sustainability. 8:76-85. https://doi.org/10.4995/vitruvio-ijats.2023.195967685

Energy and sustainability assessment of municipal wastewater treatment under circular economy paradigm

Climate change and anthropogenic pollution have put limited water resources under pressure. Lack of basic sanitation services as well as the discharge of improperly treated effluent from wastewater treatment plants (WWTP) result in the deposition of large amounts of organic matter and nutrients, which have major detrimental effects on health. Wastewater treatment (WWT) can reduce water pollution but at the cost of increasing energy consumption and the corresponding atmosphere and climate problems. Sustainable WWT management is a global challenge to preserve fresh water and decrease energy consumption. Nowadays it becomes obvious that existing WWTP operation model, based on the linear "take-make-dispose" pattern, is no longer sustainable. Furthermore, disposal of a product in landfill means that all residual energy is lost. The adoption of circular economy (CE) practices with its 3R principles of reducing, reusing and recycling material appears as a timely, relevant and practical option to meet the goals of sustainable development. WWTP is a critical element in CE implementation policy and to measure the degree of "circularity" there is a need for indicators. This study considers the holistic overview of measuring the progress of CE implementation at WWTP under 3R principles using life cycle analysis (LCA) and material flow analysis (MFA) frameworks. The paper presents the principles of CE indicators set construction using managerial approach. The proposed set of indicators and integral circularity index are studied under three scenarios, based on real performance of northern and southern WWTP in Ekaterinburg, Russia. This study provides an efficient assessment tool of CE progress, which is rather simple for calculation and interpretation and suitable for the use of wide range of stakeholders