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

被引：11

作者：

Nde-Tchoupe, Arnaud Igor ^{[1
]}

Makota, Suzanne ^{[1
]}

Nassi, Achille ^{[1
]}

Hu, Rui ^{[2
]}

Noubactep, Chicgoua ^{[3
,4
]}

机构：

[1] Univ Douala, Fac Sci, Dept Chem, BP 24157, Douala, Cameroon

[2] Hohai Univ, Sch Earth Sci & Engn, Fo Cheng Xi Rd 8, Nanjing 211100, Jiangsu, Peoples R China

[3] Univ Gottingen, Dept Appl Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany

[4] Nelson Mandela African Inst Sci & Technol, Dept Water & Environm Sci & Engn, Arusha 447, Tanzania

来源：

WATER | 2018年 / 10卷 / 04期

关键词：

aqueous corrosion; packed-bed filters; pozzolan; water treatment; zero-valent iron; COMPOSITE IRON MATRIX; MIXING GRANULAR IRON; METALLIC IRON; ARSENIC REMOVAL; METHYLENE-BLUE; DRINKING-WATER; HOUSEHOLD FILTER; SAND; GROUNDWATER; DISCOLORATION;

D O I：

10.3390/w10040417

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 (Fe-0-filters). Investigated systems were: (i) pure sand, (ii) pure PZ, (iii) pure Fe-0, (iv) Fe-0/ sand, (v) Fe-0 / PZ, and (vi) Fe-0/ sand / PZ. The volumetric proportion of Fe-0 was 25%. The volumetric proportions of the Fe-0 / sand / PZ system was 25 / 45/ 30. The initial MB concentration was 2.0 mg. L-1, 6.0 g of Fe-0 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 Fe-0 / 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 Fe-0 / H2O system was confirmed. The tested PZ is recommended as an alternative material for efficient but sustainable Fe-0 filters.

引用

页数：17

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