1,721,051 research outputs found
HydroWEEE project: Design and construction of a mobile demonstration plant
No full textThe objective of this chapter is to describe a mobile demonstration plant for the recovery of metals from waste electrical and electronic equipment and other waste such as spent batteries and exhausted industrial catalysts. The plant was designed within the European FP7 framework HydroWEEE demo (2012-16) and can offer an effective proposal to addressing the problem of electronic waste, reducing the environmental impact of their incorrect disposal, recovering critical materials such as rare earths and precious elements, and giving economic benefits
Valorisation of mining waste for gold recovery
No full textPurpose: the metals and industrial minerals contained in the tailings produced by mining and quarrying activities, are cause of environmental damage. The objective of this experimental work is the application of innovative technologies for the treatment and exploitation of mining tailings in Romania, in order to recover materials high grade raw to be placed on the market, reducing the volume of the wastes. Further objective, is to optimize some parameters relating to the dissolution of gold and the subsequent recovery from purified solutions, determining beforehand the technical feasibility of the scheme of process developed on a laboratory scale. Methods: the study is focused on hydrometallurgical process for the recovery of gold. The innovative treatment chosen is the thiosulphate process that, compared to conventional cyanide, has several advantages, first of all the most eco-friendly and non- toxic to humans. The conventional process shows operating limits in the case of auriferous minerals refractory materials, such as Romanian wastes object of the study. Another fundamental characteristic of the ammoniacal thiosulphate solutions, is the best selectivity towards gold, not attacking the majority of the gangue mineral constituents. Results: the dissolution rates of gold reached a final value of 70% Au – working at room temperature – with recoveries of the global process of about 65%, in line with the conventional process. Main conclusions: these results are very encouraging, considering that this is an innovative process, applied to a low content gold ore. The optimization of parameters and operating conditions, and the industrial treatment, continuous and scale greater would certainly permit to reach the best results in terms of process yields and energetic and reagents consumption
Pilot-scale experiences with aerobic treatment and chemical processes of industrial wastewaters from electronics and semiconductor industry
Full text linkTMAH is quaternary ammonium salt, consists of a methylated nitrogen molecule, and is widely used in the electronics industry as a developer and silicon etching agent. This substance is toxic and fatal if ingested. It can also cause skin burns, eye damage, and organ damage. Moreover, TMAH exhibits long-lasting toxicity to aquatic systems. Despite this known toxicity, the authorities currently do not provide emission limits (i.e., discharge concentrations) for wastewater by EU regulation. The current scenario necessitates the study of the processes for industrial wastewater containing TMAH. This work aims to present a successful example of the treatment process for the degradation of TMAH waste solutions of the E&S industry. Research was conducted at the pilot scale, and the process feasibility (both technical and economic) and its environmental sustainability are demonstrated. This process, which treats three exhausted solutions with a high concentration of toxic substances, is considered to be innovative
Treatment of concentrated arsenic(V) solutions by micellar enhanced ultrafiltration with high molecular weight cut-off membrane
No full textTreatment of concentrated arsenic (v) solutions by micellar enhanced ultrafiltration with high molecular weight cut off membrane
No full textIn this work arsenic removal by micellar enhanced ultrafiltration (MEUF) was investigated using cetylpyridinium chloride (CPC) and a crossflow
polyethersulphone (PES) membrane apparatus. The effects of some operating factors on permeate flux, arsenic and CPC rejections were
investigated and, in particular, transmembrane pressure, pH, CPC concentration, As concentration and ionic strength. The novel aim of this work is
evaluating the possible advantages of using large molecular weight cut-off membrane (100 kDa) and reduced surfactant concentrations (1–3 mM)
for treating high fluxes of concentrated arsenic-bearing solutions (6–10 ppm).
The experimental results reported in this paper show that PES membrane apparatus with high molecular weight cut-off allowed to treat large
fluxes of concentrated arsenic-bearing solutions (6–10 ppm) even by using low surfactant concentration (1–3 mM). In particular arsenic removal
ranged from 93–98% to 70–74% depending on initial As concentration (6 and 10 ppm, respectively). In addition surfactant leakage in the permeate
was always below CMC due to presieving of concentration polarisation layer. The favourable combination of high MWCO membranes and low
surfactant concentration can benefit to overall process economics for the lower membrane area requirement (due to greater flux) and the reduced
surfactant consumption
Review analysis with some experimental results in the characterization of waste printed circuit boards (WPCBs) by physical process for metals classification and precious metals recovery
No full textCyberful—Virtual reality in arm and hand rehabilitation
No full textZusammenfassung Die Umsetzung der spezialisierten Nachbehandlung von Funktions- und Schmerzstörungen des Arms und der Hand ist eine Herausforderung. Im Rahmen eines Verbundprojekts des Bundesministeriums für Bildung und Forschung (BMBF) wurde ein Virtual-Reality(VR)-System entwickelt. Durch eine innovative, nichtinvasive, orts- und infrastrukturunabhängige Visualisierungstechnologie führt es hochspezialisierte, etablierte Therapieansätze wie geführte Bewegungsübungen, Motor Imagery und Spiegeltherapie für eine nahtlose, hochspezifische und erfolgreiche sensomotorische Rehabilitation zusammen. Neben Amputationen und Nervenverletzungen adressiert diese VR-Therapie gleichermaßen weitere traumatische sowie neurologische Funktions- und Sensibilitätsstörungen der oberen Extremität und damit verbundene Schmerzphänomene. Dieser Beitrag beleuchtet die Grundlagen des Systems, seine therapeutischen Anwendungen und das Potenzial dieser innovativen Technologie zur Verbesserung der gegenwärtigen sensomotorischen Rehabilitation und Lebensqualität von Betroffenen.Abstract The implementation of specialized follow-up treatment of functional disorders and associated pain of the arm and hand is a challenge. As part of a collaborative project funded by the German Federal Ministry of Education and Research (BMBF), an innovative and noninvasive visualization technology was developed that is independent of the location and infrastructure. The virtual reality (VR) system NeuroXR integrates highly specialized and established treatment approaches, such as guided movement exercises, motor imagery and mirror therapy for successful seamless and highly specific sensorimotor rehabilitation. This VR treatment addresses not only amputations and nerve injuries but also other traumatic and neurological functional and sensory disorders of the upper extremities, along with associated pain phenomena. This article explores the fundamental principles of the system, its therapeutic applications and the potential of this innovative technology to improve current sensorimotor rehabilitation practices and improve the quality of life for affected individuals.Zusammenfassung Die Umsetzung der spezialisierten Nachbehandlung von Funktions- und Schmerzstörungen des Arms und der Hand ist eine Herausforderung. Im Rahmen eines Verbundprojekts des Bundesministeriums für Bildung und Forschung (BMBF) wurde ein Virtual-Reality(VR)-System entwickelt. Durch eine innovative, nichtinvasive, orts- und infrastrukturunabhängige Visualisierungstechnologie führt es hochspezialisierte, etablierte Therapieansätze wie geführte Bewegungsübungen, Motor Imagery und Spiegeltherapie für eine nahtlose, hochspezifische und erfolgreiche sensomotorische Rehabilitation zusammen. Neben Amputationen und Nervenverletzungen adressiert diese VR-Therapie gleichermaßen weitere traumatische sowie neurologische Funktions- und Sensibilitätsstörungen der oberen Extremität und damit verbundene Schmerzphänomene. Dieser Beitrag beleuchtet die Grundlagen des Systems, seine therapeutischen Anwendungen und das Potenzial dieser innovativen Technologie zur Verbesserung der gegenwärtigen sensomotorischen Rehabilitation und Lebensqualität von Betroffenen.Abstract The implementation of specialized follow-up treatment of functional disorders and associated pain of the arm and hand is a challenge. As part of a collaborative project funded by the German Federal Ministry of Education and Research (BMBF), an innovative and noninvasive visualization technology was developed that is independent of the location and infrastructure. The virtual reality (VR) system NeuroXR integrates highly specialized and established treatment approaches, such as guided movement exercises, motor imagery and mirror therapy for successful seamless and highly specific sensorimotor rehabilitation. This VR treatment addresses not only amputations and nerve injuries but also other traumatic and neurological functional and sensory disorders of the upper extremities, along with associated pain phenomena. This article explores the fundamental principles of the system, its therapeutic applications and the potential of this innovative technology to improve current sensorimotor rehabilitation practices and improve the quality of life for affected individuals
Leaching of yttrium from cathode ray tube fluorescent powder: Kinetic study and empirical models
No full textReducing acid leaching of manganiferous ore: effect of the iron removal operation on solid waste disposal
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