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/TS) for the adsorption of NH and PO from contaminated waters. The experiments were performed on a model solution simulating real wastewater with a concentration of 1.7 mmol·L (NH) and 0.2 mmol·L (PO). The adsorption of PO had a high efficiency (>99%) on B, B and TS, while for TS, the adsorption of PO was futile due to the high content of available P in the raw TS. The adsorption of NH on all sorbents (B/B, TS/TS) 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 and TS/TS before and after NH and PO sorption when the contents of these ions in the leachates were affected by adsorption experiments in the cases of B and TS. For B and TS, the ion content in the leachates before and after the adsorption experiments was similar.
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| http://dx.doi.org/10.3390/ma16041448 | DOI Listing |
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