The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters
Journal: Water, 201810, 4: 1 - 17
DOI: https://doi.org/10.3390/w10040417
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7008
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7008
Ndé-Tchoupé, Arnaud; Makota, Suzanne; Nassi, Achille; Hu, Rui; Noubactep, Chicgoua, 2018: The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters. In: Water, Band 10, 4: 1 - 17, DOI: 10.3390/w10040417.
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Continuous gravity-fed column experiments using the methylene blue (MB) discoloration
method were performed to characterize the suitability of a pozzolan (PZ) specimen as alternative
admixing aggregate for metallic iron filters (Fe0-filters). Investigated systems were: (i) pure sand,
(ii) pure PZ, (iii) pure Fe0, (iv) Fe0/sand, (v) Fe0/PZ, and (vi) Fe0/sand/PZ. The volumetric proportion
of Fe0 was 25%. The volumetric proportions of the Fe0/sand/PZ system was 25/45/30. The initial
MB concentration was 2.0 mg Lð€€€1, 6.0 g of Fe0 was used, and the experiments lasted for 46 days.
The individual systems were fed with 3.9 to 8.4 L (7.80 to 16.69 mg of MB) and were characterized by
the time-dependent changes of: (i) the pH value, (ii) the iron breakthrough, (iii) the MB breakthrough,
and (iv) the hydraulic conductivity. Results showed that the Fe0/sand/PZ system was the most
efficient. This ternary system was also the most permeable and therefore the most sustainable.
The suitability of MB as a powerful operative indicator for the characterization of processes in
the Fe0/H2O system was confirmed. The tested PZ is recommended as an alternative material for
efficient but sustainable Fe0 filters.
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