期刊
MINERALS
卷 11, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/min11040349
关键词
chromate; wastewaters; adsorption; biogenic iron precipitates; alginate beads
资金
- Spanish Ministry of Economy and Competitiveness [MAT2014-59222R]
Iron nanoparticles produced by a microbial consortium showed promising adsorption capabilities for metal removal from electroplating industry wastewaters. Optimization of fixed-bed columns can be achieved to enhance adsorption performance, with the up-flow system significantly improving metal uptake efficiency.
Nanoparticles of iron precipitates produced by a microbial consortium are a suitable adsorbent for metal removal from electroplating industry wastewaters. Biogenic iron precipitates were utilized as adsorbents for chromate and zinc in batch conditions. Furthermore, the iron precipitates were embedded in alginate beads for metal removal in fixed-bed columns, and their performance was evaluated in a continuous system by varying different operational parameters such as flow rate, bed height, and feeding system (down- and up-flows). The influence of different adsorption variables in the saturation time, the amount of adsorbed potentially toxic metals, and the column performance was investigated, and the shape of the breakthrough curves was analyzed. The optimal column performance was achieved by increasing bed height and by decreasing feed flow rate and inlet metal concentration. The up-flow system significantly improved the metal uptake, avoiding the preferential flow channels.
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