The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters
AbstractContinuous 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·L−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. View Full-Text
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Ndé-Tchoupé, A.I.; Makota, S.; Nassi, A.; Hu, R.; Noubactep, C. The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters. Water 2018, 10, 417.
Ndé-Tchoupé AI, Makota S, Nassi A, Hu R, Noubactep C. The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters. Water. 2018; 10(4):417.Chicago/Turabian Style
Ndé-Tchoupé, Arnaud I.; Makota, Suzanne; Nassi, Achille; Hu, Rui; Noubactep, Chicgoua. 2018. "The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters." Water 10, no. 4: 417.
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