Optimization and dust emissions analysis of the air jigging technology applied to the recycling of construction and demolition waste

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Defense date2020-07-15
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Abstract
This work aims to evaluate the use of the air jigging technique, a density-based separation technology commonly
applied in mineral processing, to upgrade the quality of mixtures (density and geometric properties) that represents
the typical composition of construction and demolition waste (CDW) produced in Brazil. In this sense,
tests involving the variation of the main operational parameters of jigging (bed expansion rate, pulsation frequency
and jigging time) were carried out aiming to find those which provided the best recycled aggregates
quality after processing. Also, fines and dust emissions generation during jigging were measured in order to
estimate their potential impacts on human health and environment. The results showed that the air jigging
process is adequate to improve the quality of CDW by increasing the concrete concentration in the dense product.
The use of high bed expansion rates showed to be of major importance to decrease the content of ceramic aggregates in the dense product, allowing obtaining products richer in concrete. Also, the measured properties of
the obtained aggregates (size distribution, shape, etc) met the usual standards required for natural aggregates.
Finally, material losses and dust emissions generated were negligible in comparison to the total mass processed,
although special attention must be given to safety measures due the presence of inhalable particles (<10 µm).
Description
© 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
CitationWaskow, R. [et al.]. Optimization and dust emissions analysis of the air jigging technology applied to the recycling of construction and demolition waste. "Journal of environmental management", 15 Juliol 2020, vol. 266, p. 110614: 1-110614: 8.
ISSN0301-4797
Publisher versionhttps://www.sciencedirect.com/science/article/pii/S0301479720305466
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