<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The main source of usable water supply in Poland is surface water. The most frequently used methods of surface water treatment are coagulation and filtration processes. During these processes post-coagulation sludge is generated, which is the main waste produced in water treatment plants. This sludge is characterized by an amorphous structure with a strongly developed specific surface, similar to sewage sludge. Dried and crushed post-coagulation sludge was used in the studies as an adsorbent of two acid dyes: Acid Red 18 (AR 18) and Acid Green 16 (AG 16). The most favourable pH of process and contact time as well as sorption isotherm were established. For both dyes the most favourable pH value was equal 2. The tests showed that in the case of AR 18 (180 min) a longer contact time was necessary to reach the equilibrium than for AG 16 (120 min). Moreover, based on the different isotherm two-parameter models, the sorption capacity, type of sorption and energy of sorption were calculated based on linear and non-linear regression. The tests showed that in the case of dye AG 16 monolayer sorption occurred - the analysis showed better fitting the results to Langmuir model. Moreover, for both dyes, physical adsorption took place - it was indicated by the values of parameter 1<italic>/n</italic> (computed from the Freundlich model).</p></abstract>

The main source of usable water supply in Poland is surface water. The most frequently used methods of surface water treatment are coagulation and filtration processes. During these processes post-coagulation sludge is generated, which is the main waste produced in water treatment plants. This sludge is characterized by an amorphous structure with a strongly developed specific surface, similar to sewage sludge. Dried and crushed post-coagulation sludge was used in the studies as an adsorbent of two acid dyes: Acid Red 18 (AR 18) and Acid Green 16 (AG 16). The most favourable pH of process and contact time as well as sorption isotherm were established. For both dyes the most favourable pH value was equal 2. The tests showed that in the case of AR 18 (180 min) a longer contact time was necessary to reach the equilibrium than for AG 16 (120 min). Moreover, based on the different isotherm two-parameter models, the sorption capacity, type of sorption and energy of sorption were calculated based on linear and non-linear regression. The tests showed that in the case of dye AG 16 monolayer sorption occurred - the analysis showed better fitting the results to Langmuir model. Moreover, for both dyes, physical adsorption took place - it was indicated by the values of parameter 1/n (computed from the Freundlich model).

Post-Coagulation Sludge as an Adsorbent of Dyes from Aqueous Solutions

Faculty of Energy and Environmental Engineering

Ecological Chemistry and Engineering S

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Post-Coagulation Sludge as an Adsorbent of Dyes from Aqueous Solutions"}

The main source of usable water supply in Poland is surface water. The most frequently used methods of surface water treatment are coagulation and filtration...

Post-Coagulation Sludge as an Adsorbent of Dyes from Aqueous Solutions

Published Online: Oct 11, 2019

Page range: 509 - 520

DOI: https://doi.org/10.1515/eces-2019-0038

Keywords
water treatment, dye adsorption, waste sorbents, sorption isotherm

© 2019 Barbara Pieczykolan et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Post-Coagulation Sludge as an Adsorbent of Dyes from Aqueous Solutions

Published Online: Oct 11, 2019

Page range: 509 - 520

DOI: https://doi.org/10.1515/eces-2019-0038

Keywordswater treatment, dye adsorption, waste sorbents, sorption isotherm

© 2019 Barbara Pieczykolan et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
water treatment, dye adsorption, waste sorbents, sorption isotherm