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Leaching is a primary extractive operation in hydrometallurgical processing, by which a metal of interest is transferred from naturally occurring minerals into an aqueous solution. In essence, it involves the selective dissolution of valuable minerals, where the ore, concentrate, or matte is brought into contact with an active chemical solution known as a leach solution. Currently, the hydrometallurgical processes have a great number of applications, not only in the mining sector—in particular, for the recovery of precious metals—but also in the environmental sector, for the recovery of toxic metals from wastes of various types, and their reuse as valuable metals, after purification. Therefore, there is an increasing need to develop novel solutions, to implement environmentally sustainable practices in the recovery of these valuable and precious metals, with particular reference to critical metals; those included in materials that are indispensable to modern life and for which an exponential increase in consumption is already a reality, or will be in a short-term perspective. For publication in this Special Issue, consideration has been given to articles that contribute to the optimization of the kinetic conditions of innovative hydrometallurgical processes—economic and of low environmental impact—applied to the recovery of valuable and critical metals.

Research & information: general --- eudialyte --- rare earth elements --- dry digestion --- leaching --- neural network --- uranium --- contaminated groundwater --- permeable reactive barrier --- zero-valent iron --- Al-Ni alloys --- aluminothermic reactions --- reaction rate --- Al master alloys --- kinetics --- Hydrometallurgical processes --- Chalcopyrite --- low-pressure leaching --- mining waste --- hydrometallurgical processes --- leaching kinetic --- thiosulphate leaching --- electrowinning --- gold --- waste printed circuit board --- iodide --- iodine --- ascorbic acid --- precipitation --- thiosulfate oxidation --- catalysis --- oxygen --- high alumina fly ash --- desilication rate --- physical–chemical activation --- alumina silica mass ratio --- refractory gold concentrate --- resources depletion --- reducing harmful emissions --- arsenic --- nitric acid --- shrinking core model --- pyrite --- arsenopyrite --- clays --- nanoscale zero-valent iron --- groundwater --- wastewater --- geochemical characteristics --- pitchblende --- U neutral leaching --- ELZPA ore deposit in Pakistan --- n/a --- physical-chemical activation

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Leaching is a primary extractive operation in hydrometallurgical processing, by which a metal of interest is transferred from naturally occurring minerals into an aqueous solution. In essence, it involves the selective dissolution of valuable minerals, where the ore, concentrate, or matte is brought into contact with an active chemical solution known as a leach solution. Currently, the hydrometallurgical processes have a great number of applications, not only in the mining sector—in particular, for the recovery of precious metals—but also in the environmental sector, for the recovery of toxic metals from wastes of various types, and their reuse as valuable metals, after purification. Therefore, there is an increasing need to develop novel solutions, to implement environmentally sustainable practices in the recovery of these valuable and precious metals, with particular reference to critical metals; those included in materials that are indispensable to modern life and for which an exponential increase in consumption is already a reality, or will be in a short-term perspective. For publication in this Special Issue, consideration has been given to articles that contribute to the optimization of the kinetic conditions of innovative hydrometallurgical processes—economic and of low environmental impact—applied to the recovery of valuable and critical metals.

Research & information: general --- eudialyte --- rare earth elements --- dry digestion --- leaching --- neural network --- uranium --- contaminated groundwater --- permeable reactive barrier --- zero-valent iron --- Al-Ni alloys --- aluminothermic reactions --- reaction rate --- Al master alloys --- kinetics --- Hydrometallurgical processes --- Chalcopyrite --- low-pressure leaching --- mining waste --- hydrometallurgical processes --- leaching kinetic --- thiosulphate leaching --- electrowinning --- gold --- waste printed circuit board --- iodide --- iodine --- ascorbic acid --- precipitation --- thiosulfate oxidation --- catalysis --- oxygen --- high alumina fly ash --- desilication rate --- physical-chemical activation --- alumina silica mass ratio --- refractory gold concentrate --- resources depletion --- reducing harmful emissions --- arsenic --- nitric acid --- shrinking core model --- pyrite --- arsenopyrite --- clays --- nanoscale zero-valent iron --- groundwater --- wastewater --- geochemical characteristics --- pitchblende --- U neutral leaching --- ELZPA ore deposit in Pakistan --- eudialyte --- rare earth elements --- dry digestion --- leaching --- neural network --- uranium --- contaminated groundwater --- permeable reactive barrier --- zero-valent iron --- Al-Ni alloys --- aluminothermic reactions --- reaction rate --- Al master alloys --- kinetics --- Hydrometallurgical processes --- Chalcopyrite --- low-pressure leaching --- mining waste --- hydrometallurgical processes --- leaching kinetic --- thiosulphate leaching --- electrowinning --- gold --- waste printed circuit board --- iodide --- iodine --- ascorbic acid --- precipitation --- thiosulfate oxidation --- catalysis --- oxygen --- high alumina fly ash --- desilication rate --- physical-chemical activation --- alumina silica mass ratio --- refractory gold concentrate --- resources depletion --- reducing harmful emissions --- arsenic --- nitric acid --- shrinking core model --- pyrite --- arsenopyrite --- clays --- nanoscale zero-valent iron --- groundwater --- wastewater --- geochemical characteristics --- pitchblende --- U neutral leaching --- ELZPA ore deposit in Pakistan

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This Special Issue focused on innovative solutions for the biological treatment of organic waste from wastewater. In particular, research articles included in this SI are related to: Process mechanisms and operation, optimization, monitoring, modeling, and applications; Removal of pathogens and emerging pollutants; Reuse and circular economy; Resource recovery (e.g., nutrients recovery, high-value compounds) and energy valorization (e.g., biogas); Life cycle assessment and carbon footprint; Technoeconomic assessment and social perception of waste-to-resource processes; Low-cost technologies; Policy. Overall, this SI provides new ways to valorize organic waste from wastewater and describe novel processes as well as the environmental and social benefits in the frame of the Sustainable Development Goals.

Technology: general issues --- History of engineering & technology --- synthetic microbial community --- ammonium --- heterotrophic nitrification --- aerobic denitrification --- livestock wastewater --- anaerobic co-digestion --- food wastes --- waste-activated sludge --- nano magnetite --- iron oxide nano particles --- nano zero valent iron --- sewage sludge --- nano particles --- organic wastes --- anaerobic digestion (AD) --- biogas --- life cycle assessment (LCA) --- methane --- waste activated sludge (WAS) --- wastewater treatment plant (WWTP) --- anaerobic digestion acceptance --- structural equation model --- energy policy --- sustainable energy technology --- rural development --- mesophilic --- thermophilic --- temperature-phased anaerobic digestion (TPAD) --- dewaterability --- sludge quality --- sludge valorisation --- synthetic microbial community --- ammonium --- heterotrophic nitrification --- aerobic denitrification --- livestock wastewater --- anaerobic co-digestion --- food wastes --- waste-activated sludge --- nano magnetite --- iron oxide nano particles --- nano zero valent iron --- sewage sludge --- nano particles --- organic wastes --- anaerobic digestion (AD) --- biogas --- life cycle assessment (LCA) --- methane --- waste activated sludge (WAS) --- wastewater treatment plant (WWTP) --- anaerobic digestion acceptance --- structural equation model --- energy policy --- sustainable energy technology --- rural development --- mesophilic --- thermophilic --- temperature-phased anaerobic digestion (TPAD) --- dewaterability --- sludge quality --- sludge valorisation

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This Special Issue focused on innovative solutions for the biological treatment of organic waste from wastewater. In particular, research articles included in this SI are related to: Process mechanisms and operation, optimization, monitoring, modeling, and applications; Removal of pathogens and emerging pollutants; Reuse and circular economy; Resource recovery (e.g., nutrients recovery, high-value compounds) and energy valorization (e.g., biogas); Life cycle assessment and carbon footprint; Technoeconomic assessment and social perception of waste-to-resource processes; Low-cost technologies; Policy. Overall, this SI provides new ways to valorize organic waste from wastewater and describe novel processes as well as the environmental and social benefits in the frame of the Sustainable Development Goals.

synthetic microbial community --- ammonium --- heterotrophic nitrification --- aerobic denitrification --- livestock wastewater --- anaerobic co-digestion --- food wastes --- waste-activated sludge --- nano magnetite --- iron oxide nano particles --- nano zero valent iron --- sewage sludge --- nano particles --- organic wastes --- anaerobic digestion (AD) --- biogas --- life cycle assessment (LCA) --- methane --- waste activated sludge (WAS) --- wastewater treatment plant (WWTP) --- anaerobic digestion acceptance --- structural equation model --- energy policy --- sustainable energy technology --- rural development --- mesophilic --- thermophilic --- temperature-phased anaerobic digestion (TPAD) --- dewaterability --- sludge quality --- sludge valorisation --- n/a

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The recent developments in the environmental applications of heterogenous catalysis and photocatalysis are described in this book, focusing on air and water purification using innovative and performing catalysts and applying new green and sustainable processes.

Technology: general issues --- Chemical engineering --- ceria --- pesticide --- photocatalysis --- photo-Fenton --- AOPs --- thin films --- ZnO --- doping --- heterogeneous photocatalysis --- VOCs --- bimetallic catalysts --- air purification --- catalytic combustion --- China --- elimination technology --- pharmaceutical industry --- advanced oxidation processes --- ozone --- ultraviolet --- bleaching --- fabrics --- industrial wastewater --- zero valent iron --- magnetite --- hematite --- alkali-activated material --- geopolymer --- blast furnace slag --- catalytic wet peroxide oxidation --- Fe-catalyst --- bisphenol A --- Mn-Zr solid solution --- toluene --- active oxygen --- combustion --- VOC --- photothermo catalysis --- ethanol --- manganese oxide --- zirconium oxide --- hydrothermal preparation --- co-precipitation --- CuFeS2 --- Fenton-like reaction --- degradation --- environmental water samples --- ciprofloxacin --- levofloxacin --- gC3N4 --- rGO --- Au nanoparticles --- n/a