Publication detail

Modification by washing of recycled aggregates from construction and demolition waste for vertical subsurface flow constructed wetlands

ZEDNÍK, O. KRIŠKA-DUNAJSKÝ, M.

Original Title

Modification by washing of recycled aggregates from construction and demolition waste for vertical subsurface flow constructed wetlands

Type

conference paper

Language

English

Original Abstract

As the planet’s population increases, pollution entering waterways increases, and the availability of non-renewable raw resource materials reduces. It is possible to reduce this pollution by constructing treatment wetlands, but these wetlands use significant amounts of natural aggregates. The question arises: is it not possible to replace non-renewable resources with recycled materials made from construction and demolition waste? This article examines the applicability of recycled building materials as filter media for vertical subsurface flow filters. The recycled aggregates of the 0–4 mm fraction are evaluated in terms of grain size and hydraulic conductivity. For the Czech Republic’s available raw recycled aggregates, washing methods are proposed to produce materials that meet the required grain size limits. Untreated aggregates contain a significant proportion of particles smaller than 0.063 mm (up to 21.8%), significantly reducing their hydraulic conductivity and preventing their use in water filtration. However, concrete and masonry aggregates with dust particle contents of 0.3% and 1.5% can be obtained through washing. The washed materials subsequently show an increase in hydraulic conductivity up to the required range of values, that is 10−4–10−3 m s−1. According to the evaluation carried out, it is possible to apply treated recycled materials to wastewater filtration. At the same time, the application of construction waste in constructed treatment wetlands creates opportunities to use fine recycled aggregates (0–4 mm) in these areas, which are currently limited, in the future.

Keywords

Construction and demolition waste, Recycled aggregates, Filter materials, Vertical flow constructed wetlands

Authors

ZEDNÍK, O.; KRIŠKA-DUNAJSKÝ, M.

Released

9. 12. 2022

Publisher

STEF92 Technology

Location

Bulgaria

ISBN

978-619-7603-50-7

Book

Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022

Edition

Energy and Clean Technologies

Edition number

1

ISBN

1314-2704

Periodical

International multidisciplinary geoconference SGEM

Year of study

22

Number

4.2

State

Republic of Bulgaria

Pages from

1

Pages to

8

Pages count

8

BibTex

@inproceedings{BUT180341,
  author="Ondřej {Zedník} and Michal {Kriška-Dunajský}",
  title="Modification by washing of recycled aggregates from construction and demolition waste for vertical subsurface flow constructed wetlands",
  booktitle="Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022",
  year="2022",
  series="Energy and Clean Technologies",
  journal="International multidisciplinary geoconference SGEM",
  volume="22",
  number="4.2",
  pages="1--8",
  publisher="STEF92 Technology",
  address="Bulgaria",
  doi="10.5593/sgem2022V/4.2/s18.10",
  isbn="978-619-7603-50-7",
  issn="1314-2704"
}