Arsenic removal from high-arsenic water by enhanced coagulation with ferric ions and coarse calcite
| Autor: | C. Peng, D.J. Hernandez-Campos, Shaoxian Song, M.G. Monroy-Fernandez, I. Razo-Soto, Alejandro Lopez-Valdivieso |
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| Rok vydání: | 2004 |
| Předmět: |
inorganic chemicals
Flocculation Environmental Engineering Microfiltration Iron Mineralogy chemistry.chemical_element Mining Membrane technology Arsenic Calcium Carbonate Water Purification chemistry.chemical_compound medicine Water Pollutants Waste Management and Disposal Water Science and Technology Civil and Structural Engineering Calcite integumentary system Filter paper Ecological Modeling Pollution Calcium carbonate chemistry Chemical engineering Ferric Filtration medicine.drug |
| Zdroj: | Water research. 40(2) |
| ISSN: | 0043-1354 |
| Popis: | Arsenic removal from high-arsenic water in a mine drainage system has been studied through an enhanced coagulation process with ferric ions and coarse calcite (38–74 μm) in this work. The experimental results have shown that arsenic-borne coagulates produced by coagulation with ferric ions alone were very fine, so micro-filtration (membrane as filter medium) was needed to remove the coagulates from water. In the presence of coarse calcite, small arsenic-borne coagulates coated on coarse calcite surfaces, leading the settling rate of the coagulates to considerably increase. The enhanced coagulation followed by conventional filtration (filter paper as filter medium) achieved a very high arsenic removal (over 99%) from high-arsenic water (5 mg/l arsenic concentration), producing a cleaned water with the residual arsenic concentration of 13 μg/l. It has been found that the mechanism by which coarse calcite enhanced the coagulation of high-arsenic water might be due to attractive electrical double layer interaction between small arsenic-borne coagulates and calcite particles, which leads to non-existence of a potential energy barrier between the heterogeneous particles. |
| Databáze: | OpenAIRE |
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