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Title:

USING DEMOLITION CONCRETE FOR DYE ADSORPTION IN TEXTILE WASTEWATER TREATMENT

Document type:
Konferenzbeitrag
Contribution type:
Poster
Author(s):
Behringer, Martin; Hilbig, Harald; Helmreich, Brigitte; Machner, Alisa
Abstract:
BACKGROUND: Fast fashion causes significant environmental issues in modern societies. In many producing countries in the global south, the lack of strict regulations poses hazards to flora, fauna, and humans. Existing methods for dye removal from textile wastewater are often expensive. Given that cementitious materials can adsorb dyes, this study investigates the use of demolition concrete as a potential adsorption material for textile wastewater treatment. Within this study, we evaluate five different concrete mixes using a CEM II/B-M (V-LL) with two different water-to-solid ratios, a CEM II/C-M (S-LL), a CEM II/B-M (S-LL), and a CEM III/A on their dye uptake potential. Samples were prepared with a granulate size ranging from 0.1 mm to 2 mm. The decolourisation properties of these samples were tested using the anionic dye Reactive Blue 19 in various environments, such as a low and high pH, and in different salts, including MgSO4, Na2SO4, and NaCl. RESULTS & DISCUSSION: The highest adsorption capacity of 1.6 mg/g was determined for the sample with the CEM II/B-M (V-LL), whereby the difference between the five concrete designs was slight. Decolourisation was less effective at a pH of 5 than in a neutral system despite several cementitious phases showing higher adsorption capacities at lower pH values in our preliminary studies. Looking at different salts in the wastewater revealed that MgSO4 significantly enhances the dye uptake to 4.3 mg/g, whereas other salt solutions showed similar values compared to the pure system. CONCLUSION: Demolition concrete can be used to partially cleanse textile wastewater by the adsorption of the anionic dye Reactive Blue 19. The highest adsorption capacity was measured in solutions containing MgSO4, where the adsorption capacity is approximately twice as high as of a pure dye solution. The choice of the concrete mix design regarding supplementary cementitious materials does not significantly impact the decolourisation efficacy in the tested environment. Therefore, a variety of concrete waste can be effectively utilized in wastewater cleansing applications.
Book / Congress title:
Waste to Materials in Building and Construction
Congress (additional information):
Conference for Young Researchers and Professionals
Organization:
DTU Sustain - Department of Environmental and Resource Engineering
Date of congress:
11. - 13.09.2024
Year:
2024
Reviewed:
nein
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