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Water 2018, 10(4), 417; https://doi.org/10.3390/w10040417

The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters

1
Department of Chemistry, Faculty of Sciences, University of Douala, Douala BP 24157, Cameroon
2
School of Earth Science and Engineering, Hohai University, Fo Cheng Xi Road 8, Nanjing 211100, China
3
Department of Applied Geology, University of Göttingen, Goldschmidtstraße 3, Göttingen D-37077, Germany
4
Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha 447, Tanzania
*
Author to whom correspondence should be addressed.
Received: 6 March 2018 / Revised: 26 March 2018 / Accepted: 28 March 2018 / Published: 2 April 2018
(This article belongs to the Section Water and Wastewater Treatment)
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Abstract

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·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
Keywords: aqueous corrosion; packed-bed filters; pozzolan; water treatment; zero-valent iron aqueous corrosion; packed-bed filters; pozzolan; water treatment; zero-valent iron
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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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.

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