Feasibility of Acoustic Sorting for Black Materials in Solid Waste Processing

During the last decade sensor based sorting like 3D cameras and Near – Infra – Red (NIR) sorting made a huge technical improvement and enabled its industrial implementation. One of the still remaining problem lies within the sorting of black materials like plastics and rubbers which are very difficult to sort by using conventional visual sensors. This results from absorption of NIR emissions. The black materials have different structures and acoustic emissions when an impact is given. By using the acquisition and analysis of the acoustic signals from the impact in frequency-domain, the characteristics and features of different materials can be extracted and then transferred to the sorting system as sorting criteria. The key device of acoustic signal acquirement and analysis is the Data Acquisition (DAQ) card. With the high development of signal processing technologies, the capacity, compatibility, stability and flexibility of a soundcard is already adequate for industrial measurements and its price is much lower than the professional DAQ cards. The Signal acquirement and analysis systems which are discussed in this paper are therefore based on computer soundcards.

Sensor based sorting, Impact acoustic, Spectrum analysis, LabVIEW

1 Introduction
2 Preparation of the Experiment
2.1 Construction of the Experimental System
2.2 Demand of Software and Device
2.3 The Method of Signal Processing and Analysis
3 Configuration of the Device Parameters
3.1 Settings for FFT Analysis
3.1.1 The Aliasing Effect
3.1.2 The Leakage Effect and Window Functions
3.2 Configuration of Soundcard
4 Process of Experiment and Analysis of Results
4.1 Selection of a suitable Shape for Particles
4.2 The Feature of the Impact Plate
4.3 Analysis of the obtained Results
5 Conclusion

Copyright: © Wasteconsult International
Quelle: Waste-to-Resources 2009 (Mai 2009)
Seiten: 21
Preis inkl. MwSt.: € 10,50
Autor: M.Sc. Jiu Huang
Prof. Dr.-Ing. Thomas Pretz

Artikel weiterleiten In den Warenkorb legen Artikel kommentieren

Diese Fachartikel könnten Sie auch interessieren:

The new Waste Framework Directive and its impact on textile waste
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2020)
In the course of implementing the circular economy package of the European Union, the Waste Framework Directive was amended recently. Textiles are no longer the poor relation of waste management but have come to the fore.

Development of local municipal solid waste management in the Western Transdanubia region of Hungary
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2020)
Hungarian municipal solid wastes (MSW) management has developed tremendously over the past 15 years. More than 3,000 landfills and dumps had been closed, just to mention one improvement. However, still, lots of work is necessary to accomplish the EU’s ambitious aim of decreasing landfilling and increasing recycling and composting.

Tex2Mat: The recycling of towels and laundry made from PET and cotton
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2020)
The project “Tex2Mat” was a cooperation between companies working in the field of recycling or textiles and universities specializing in the field of polymer engineering and recycling. There were two polymers (PET and PA) examined and the whole project divided into two subprojects.

State-of-the-art and future perspectives in textile recycling
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2020)
Today, the blending of materials within textiles is an asset in the design of protective clothing and various technical applications, but material mixes and blends also found their way into retail trade. The rise in end-of-life items is thus putting pressure on waste management to develop suitable recycling processes. Still, in the textile sector, waste prevention claimed by policy seems to be a pious wish.

Residual municipal waste composition analysis – New methods for Czech waste management
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2020)
Relevant information about MW composition and proper forecasting of MW composition is crucial for relevant technical and economical modelling and business planning in the field of waste management. These include techno-economical models of MW treatment units, e.g. sorting line, transfer station, energy recovery, waste collection and transport or a regional waste collection and treatment system modelling (Kropáč et al. 2018) and complex business models concerning specific investments in waste management. In this context, there is a project under the Ministry of Environment of the Czech Republic.



 Angemeldet bleiben

Passwort vergessen?

Der ASK Wissenspool
Mit Klick auf die jüngste Ausgabe des Content -Partners zeigt sich das gesamte Angebot des Partners

Selbst Partner werden?
Dann interessiert Sie sicher das ASK win - win Prinzip:
ASK stellt kostenlos die Abwicklungs- und Marketingplattform - die Partner stellen den Content.
Umsätze werden im Verhältnis 30 zu 70 (70% für den Content Partner) geteilt.

Neu in ASK? Dann gleich registrieren und Vorteile nutzen...