Environmental impact of concrete and concrete-based construction waste leachates

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22320%2F19%3A43917934" target="_blank" >RIV/60461373:22320/19:43917934 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1755-1315/290/1/012023" target="_blank" >https://iopscience.iop.org/article/10.1088/1755-1315/290/1/012023</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1755-1315/290/1/012023" target="_blank" >10.1088/1755-1315/290/1/012023</a>

Result language

angličtina

Original language name

Environmental impact of concrete and concrete-based construction waste leachates

Original language description

Studies concerning environmental impact of construction materials are very rarely based on experiments performed with real mixed samples and test organisms (ecotoxicological bioassays). In our study, ecotoxicity of two concrete samples from different producers and one concrete-based construction waste in leachate form were assessed. Leachates were treated by various designs, i.e. i) without any treatment, ii) original pH + nutrients addition, iii) pH adjustment to 7.0, and iv) pH adjustment to 7.0 + addition of inorganic nutrients. Ecotoxicological bioassays with freshwater algae Desmodesmus subspicatus, freshwater plant Lemna minor and freshwater invertebrate Daphnia magna were performed. The metal content was determined both in solid samples and leachates. Results showed differences in toxicity level among the concrete sources when original leachates without any treatment were tested. On the contrary, the test design recommended by Czech legislation, i.e. lowering of the pH and addition of nutrients usually significantly decreased the sample toxicity and the potential differences among concrete samples. We suggest that the toxicity of concrete leachates may result not only from the highly alkaline pH but also from the potential persistence of high pH values both within dilution process and time. The higher toxicity was in accordance with higher level of leachate conductivity. Therefore, for the purposes of aquatic ecotoxicity assessment, we recommend either making no pH adjustment or performing the bioassays both with treated and untreated leachates.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

IOP Conference Series: Earth and Environmental Science

ISBN

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ISSN

1755-1307

e-ISSN

1755-1315

Number of pages

8

Pages from-to

1-8

Publisher name

IOP Publishing

Place of publication

Bristol

Event location

Praha

Event date

Jul 2, 2019

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

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