1,721,034 research outputs found
Plastic waste monitoring and recycling by hyperspectral imaging technology
No full textEnvironmentally sound management of plastic waste is a fundamental achievement in order to move towards circular economy and sustainable patterns of consumption and production. In this work, different emerging applications for plastic waste monitoring and recycling based on hyperspectral imaging (HSI) technology, coupled with chemometric logics, are presented and discussed. Marine microplastics, one of the main environmental concerns, can be recognized and characterized by HSI, providing at the same time information related to the particle morphological and morphometrical attributes. Furthermore, some critical issues in plastic recycling can be solved by HSI, as separation of polyolefins, identification of black polymers and recognition of biopolymers in conventional plastic recycled streams
Fast and effective classification of plastic waste by pushbroom hyperspectral sensor coupled with hierarchical modelling and variable selection
No full textPlastic waste management represents a global challenge in the framework of sustainable production and consumption of resources. One of the most critical issues in plastic recycling is polymer separation, necessary to obtain high-quality secondary raw material flow streams. The aim of this work was to build a classification strategy, based on pushbroom hyperspectral imaging, able to recognize the most common polymers found in mixed plastic waste to be applied at recycling plant scale. After exploring polymer spectral differences by principal component analysis, a hierarchical partial least squares-discriminant analysis, based on the acquired full spectra, and a hierarchical interval partial least squares-discriminant analysis, based on selected variables, were tested and their performances were evaluated and compared. High quality classification results were obtained in both cases, demonstrating that the developed multi-class models can be utilized in a flexible way for quality control and/or for on-line sorting actions in recycling plants
Near infrared hyperspectral imaging-based approach for end-of-life flat monitors recycling. Nahinfrarot-Hyperspektralbild-basierter Ansatz zum Recycling alter Flachbildschirme
No full textThe technological innovation and the relentless marketing of new electronic products with improved performance generate increasing quantities of Waste from Electrical and Electronic Equipment (WEEE). In this scenario, End-Of-Life (EOL) flat monitors and screens represent a category generating, as a consequence of the rapid change in technology, an important amount of waste. Considering future estimations, the implementation of an adequate recycling infrastructure is necessary. An efficient, reliable and low-cost analytical tool is thus needed to perform detection/control actions in order to assess: i) waste composition and ii) physical-chemical attributes of the resulting materials. The knowledge of these information is a requirement to set-up and to implement correct recycling actions. In this study, a cascade identification approach, based on Near InfraRed (NIR) - HyperSpectral Imaging (HSI), was carried out. More in detail, a four-steps classification was designed, implemented and set-up in order to recognize different materials occurring in a specific WEEE stream: EOL milled monitors and flat screens. Adopting the proposed approach, different material categories are correctly recognized and classified. Obtained results can be useful not only to set-up a quality control system, but also to improve sorting actions in this specific recycling sector
Analisi e gestione dei suoli contaminati da amianto
No full textLa gestione dei suoli contaminati da amianto rappresenta una tematica di interesse dal punto di vista dei possibili rischi per la salute degli operatori e della popolazione residente nelle aree limitrofe ai luoghi in cui tali suoli sono presenti. Il presente fact sheet, incentrato sui metodi analitici tradizionali ed innovativi per l’analisi dei suoli contenenti amianto, rappresenta uno strumento utile innanzitutto per gli addetti al campionamento ed alle analisi di laboratorio, ma anche per gli altri operatori addetti alla gestione di tali suoli e gli amministratori locali e i cittadini che vogliono informarsi su tale problematica
Ottimizzazione della risorsa idrica e gestione automatica del canale adduttore Tirso-Arborea. Nota II: Ottimizzazione e gestione automatica del canale.
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