Environmental life cycle assessment of industrialization process of calcined dredged sediments

This research focus on the life cycle assessment (LCA) of dredged sediments valorization. This tool is part of an environmental management approach, which makes it possible to compare the environmental loads of the different stages of the life cycle of the same product and, by the way to deduce the most polluting step in environmental terms and thus the industrialization process of dredging sediments of dams is optimized by modelling using the GEMIS (Global Emission Model for Integrated Systems) 4.95 software and the classification and characterization method. To propose a model that is the more respectful of the environment, by determining the most environmentally friendly scenario, in order to exploit these dredged sediments after calcination treatment to make them active in the field of the building’s construction. The results of this life cycle analysis study of the new industrialization process of dredged sediments show that climate change potential (GHG) is 0,246 ton of CO2eq/t of sediments, acidification potential is 4,55×10-4 ton of SO2 eq/t of sediments, the tropospheric ozone precursor potential is 9,97×10-4 ton of TOPP eq/t of sediments and the cumulative energy and exergy demand is 2506,75 in MJ/t of sediments, these values are compared to others carried out in Algeria

Environmental life cycle assessment of industrialization process of calcined dredged sediments

This research focus on the life cycle assessment (LCA) of dredged sediments valorization. This tool is part of an environmental management approach, which makes it possible to compare the environmental loads of the different stages of the life cycle of the same product and, by the way to deduce the most polluting step in environmental terms and thus the industrialization process of dredging sediments of dams is optimized by modelling using the GEMIS (Global Emission Model for Integrated Systems) 4.95 software and the classification and characterization method. To propose a model that is the more respectful of the environment, by determining the most environmentally friendly scenario, in order to exploit these dredged sediments after calcination treatment to make them active in the field of the building’s construction. The results of this life cycle analysis study of the new industrialization process of dredged sediments show that climate change potential (GHG) is 0,246 ton of CO2eq/t of sediments, acidification potential is 4,55×10-4 ton of SO2 eq/t of sediments, the tropospheric ozone precursor potential is 9,97×10-4 ton of TOPP eq/t of sediments and the cumulative energy and exergy demand is 2506,75 in MJ/t of sediments, these values are compared to others carried out in Algeria

Environmental life cycle assessment of industrialization process of calcined dredged sediments

This research focus on the life cycle assessment (LCA) of dredged sediments valorization. This tool is part of an environmental management approach, which makes it possible to compare the environmental loads of the different stages of the life cycle of the same product and, by the way to deduce the most polluting step in environmental terms and thus the industrialization process of dredging sediments of dams is optimized by modelling using the GEMIS (Global Emission Model for Integrated Systems) 4.95 software and the classification and characterization method. To propose a model that is the more respectful of the environment, by determining the most environmentally friendly scenario, in order to exploit these dredged sediments after calcination treatment to make them active in the field of the building’s construction. The results of this life cycle analysis study of the new industrialization process of dredged sediments show that climate change potential (GHG) is 0,246 ton of CO2eq/t of sediments, acidification potential is 4,55×10-4 ton of SO2 eq/t of sediments, the tropospheric ozone precursor potential is 9,97×10-4 ton of TOPP eq/t of sediments and the cumulative energy and exergy demand is 2506,75 in MJ/t of sediments, these values are compared to others carried out in Algeria

Mechanical Properties and Microstructure of Low Carbon Binders Manufactured from Calcined Canal Sediments and Ground Granulated Blast Furnace Slag (GGBS)

This research study evaluated the effects of adding Scottish canal sediment after calcination at 750 °C in combination with GGBS on hydration, strength and microstructural properties in ternary cement mixtures in order to reduce their carbon footprint (CO2) and cost. A series of physico-chemical, hydration heat, mechanic performance, mercury porosity and microstructure tests or observations was performed in order to evaluate the fresh and hardened properties. The physical and chemical characterisation of the calcined sediments revealed good pozzolanic properties that could be valorised as a potential co-product in the cement industry. The results obtained for mortars with various percentages of calcined sediment confirmed that this represents a previously unrecognised potential source of high reactivity pozzolanic materials. The evolution of the compressive strength for the different types of mortars based on the partial substitution of cement by slag and calcined sediments showed a linear increase in compressive strength for 90 days. The best compressive strengths and porosity were observed in mortars composed of 50% cement, 40% slag and 10% calcined sediment (CSS10%) after 90 days. In conclusion, the addition of calcined canal sediments as an artificial pozzolanic material could improve strength and save significant amounts of energy or greenhouse gas emissions, while potentially contributing to Scotland’s ambitious 2045 net zero target and reducing greenhouse gas emissions by 2050 in the UK and Europe

Evolution of Bioactive Components of Prickly Pear Juice (Opuntia ficus indica) and Cocktails with Orange juice

The Prickly Pear cactus (Opuntia ficus indica) adapted to the conditions of arid areas where it offers to man and animals its nourishingand therapeutics properties The importance of this crop is related to its diversity of use and ecological role The juice obtained from thefruit pulp is characterised by a high pH 5.8 making its conservation difficult and its preservation requires thermal treatment at over 115°C which is harmful for the bioactive constituents and color compared to orange juice, processed at temperatures below100°C. The objective of this study aims to valuing this wealth of bioactive molecules of prickly pear and increase its consumption in the form of cocktails with orange juice. A stabilisation treatment by heat, weakly affects polyphenols rate which decreases from 10.5% for cocktail of 30%. The loss is 12% in the prickly pear juice. However, the vitamin C content decreases from 25 to 29% following thermal treatment at 85°C for 30 min for the orange juice and prickly pear juice. Thermal treatment of these juices showed that the antioxidant activity decreases. It is 16% in the presence of 30% of prickly pear juice. During storage the loss of vitamin C is 25% in the presence of 30% pear juice; the loss in polyphenol is low. Microbiological quality control showed the effectiveness of pasteurisation at 85°C. Valorisation in the form of natural cocktail juice is particularly interesting due to the contribution of bioactives compounds. It showed acceptable sensory quality

Influence of calcined mud on the mechanical properties and shrinkage of self-compacting concrete

The use of SCC has a particular interest in terms of sustainable development. Indeed, their specific formulation leads to a greater volume of dough than for common concretes, thus, a larger quantity of cement. However, for economical, ecological and technical reasons, it is sought to limit their cement content [1]. It is therefore necessary to almost always use mineral additions as a partial replacement for cement because the technology of self-compacting concretes can consume large quantities of fines, in this case calcinated mud issued from dams dredging sediments that can give and/or ameliorate characteristics and performances of this type of concretes. Four SCCs had been formulated from the same composition where the only percentage of calcinated mud of Chorfa (west of Algeria) dam changed (0%, 10%, 20% and 30%). The effect of calcinated mud on characteristics at fresh state of SCC according to AFGC was quantified. Mechanical strengths and shrinkage deformation (total, autogenous, drying) were evaluated. The results show the possibility to make SCCs with different dosages of calcinated mud having strengths that can defy those of the control SCC. The analysis of free deformations indicates the beneficial impact of the mud by contributing to decrease the amplitudes of the shrinkage compared to those of the control SCC

Influence of calcined mud on the mechanical properties and shrinkage of self-compacting concrete

The use of SCC has a particular interest in terms of sustainable development. Indeed, their specific formulation leads to a greater volume of dough than for common concretes, thus, a larger quantity of cement. However, for economical, ecological and technical reasons, it is sought to limit their cement content [1]. It is therefore necessary to almost always use mineral additions as a partial replacement for cement because the technology of self-compacting concretes can consume large quantities of fines, in this case calcinated mud issued from dams dredging sediments that can give and/or ameliorate characteristics and performances of this type of concretes. Four SCCs had been formulated from the same composition where the only percentage of calcinated mud of Chorfa (west of Algeria) dam changed (0%, 10%, 20% and 30%). The effect of calcinated mud on characteristics at fresh state of SCC according to AFGC was quantified. Mechanical strengths and shrinkage deformation (total, autogenous, drying) were evaluated. The results show the possibility to make SCCs with different dosages of calcinated mud having strengths that can defy those of the control SCC. The analysis of free deformations indicates the beneficial impact of the mud by contributing to decrease the amplitudes of the shrinkage compared to those of the control SCC

Proposal of industrialization process of dredged sediments

Our study will focus on life cycle assessment (LCA) of dredged sediments in its environment from sediment extraction to waste treatment. This tool is part of an environmental management approach, to compare the environmental loads of the different stages of the life cycle of the same product and to deduce which stage of the scenario is the most polluting in environmental terms. Optimize the modeling of industrialization process of dredged sediments using the SimaPro 8.2.3 software to propose a model that is the most respectful of the environment. We will focus on the environmental impacts; we will try to propose the most environmentally friendly scenario to exploit these dredged sediments in the field of building construction

Proposal of industrialization process of dredged sediments

Our study will focus on life cycle assessment (LCA) of dredged sediments in its environment from sediment extraction to waste treatment. This tool is part of an environmental management approach, to compare the environmental loads of the different stages of the life cycle of the same product and to deduce which stage of the scenario is the most polluting in environmental terms. Optimize the modeling of industrialization process of dredged sediments using the SimaPro 8.2.3 software to propose a model that is the most respectful of the environment. We will focus on the environmental impacts; we will try to propose the most environmentally friendly scenario to exploit these dredged sediments in the field of building construction