AUTOMATED SORTING OF CONSTRUCTION AND DEMOLITION WASTE BY ADVANCED SPECTRAL IMAGING

Author(s): Frank Hollstein, Iñigo Cacho, Markus Wohllebe, Sixto Arnaiz
Paper category: Proceedings
Book title: IV International Conference Progress of Recycling in the Built Environment
Editor(s): Isabel M. Martins, Carina Ulsen, Yury Villagran
ISBN:
e-ISBN: 978-2-35158-208-4
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 37-45
Total Pages: 09
Language : English

Abstract: There is great growth potential for both environmental conservation and business develop-
ment through recycling of C&DW materials since they contain valuable resources and are

massively produced. C&DW is increasingly complex and therefore there is a need for shifting
from inefficient traditional recycling approaches to novel recycling solutions. One basic step

to achieve this objective is an improvement in (automatic) sorting technology. The best pro-
spects for achieving the target are sensor-based sorters equipped with advanced spectral im-
agers. However, the industrial distribution of spectral imaging in the C&DW recycling branch

is currently insufficiently widespread due to high investment costs, still insufficient robust-
ness of optical sensor hardware in harsh ambient conditions and, because of the need of sen-
sor fusion, not well-engineered special software tools to perform the sorting tasks. The contri-
bution on hand gives an overview on the state of the art according to both advanced industrial

spectral imaging systems for object classification and briefly to mechanical fractionation of
C&DW items. The main focus is placed on the closure of the two recycling circuits “grey to
grey” (concrete/plastering to concrete/plastering) and “red to red” (bricks/ceramics to
bricks/ceramics) by Mid-Wave-Infrared Hyperspectral Imaging because of their outstanding
potential for sustainability in conservation of construction resources.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00