| Autor: |
Bedrnová E; Faculty of Chemical Technology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic., Doušová B; Faculty of Chemical Technology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic., Koloušek D; Faculty of Chemical Technology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic., Maxová K; Faculty of Chemical Technology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic., Angelis M; Faculty of Chemical Technology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic. |
| Abstrakt: |
Two selected waste building sludges (WBS) were used in this study: (i) sludge from the production and processing of prestressed concrete pillars (B) and (ii) sludge from the production of technical stone (TS). The materials were used in their original and Fe-modified forms (B Fe /TS Fe ) for the adsorption of NH 4 + and PO 4 3- from contaminated waters. The experiments were performed on a model solution simulating real wastewater with a concentration of 1.7 mmol·L -1 (NH 4 + ) and 0.2 mmol·L -1 (PO 4 3- ). The adsorption of PO 4 3- had a high efficiency (>99%) on B, B Fe and TS Fe , while for TS, the adsorption of PO 4 3- was futile due to the high content of available P in the raw TS. The adsorption of NH 4 + on all sorbents (B/B Fe , TS/TS Fe ) had a lower efficiency (<60%), while TS proved to be the most effective. Leaching tests were performed according to the CSN EN 12457 standard for B/B Fe and TS/TS Fe before and after NH 4 + and PO 4 3- sorption when the contents of these ions in the leachates were affected by adsorption experiments in the cases of B and TS. For B Fe and TS Fe , the ion content in the leachates before and after the adsorption experiments was similar. |
