Iron Oxides Minimize Arsenic Mobility in Soil Material Saturated with Saline Wastewater
| Autor: | Madhubhashini B. Galkaduwa, Ganga M. Hettiarachchi, Gerard J. Kluitenberg, Stacy L. Hutchinson |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Iron chemistry.chemical_element Wastewater 010501 environmental sciences Management Monitoring Policy and Law 010502 geochemistry & geophysics Ferric Compounds complex mixtures 01 natural sciences Arsenic Soil Ferrihydrite Soil Pollutants Waste Management and Disposal Dissolution Effluent 0105 earth and related environmental sciences Water Science and Technology Chemistry Pollution Flue-gas desulfurization Environmental chemistry Soil water Saturation (chemistry) Oxidation-Reduction |
| Zdroj: | Journal of Environmental Quality. 47:873-883 |
| ISSN: | 0047-2425 |
| DOI: | 10.2134/jeq2018.01.0022 |
| Popis: | The soil material in constructed wetlands is effective in retaining Se from flue-gas desulfurization (FGD) wastewater (WW), but reducing conditions can enhance native-soil As mobility. A laboratory-based soil column experiment was performed to assess the effectiveness of ferrihydrite (Fh) in minimizing the mobility of native-soil As in water-saturated soil material. A saline FGD WW mixture (i.e., influent) was delivered to columns of untreated and Fh-treated soil for 60 d. One untreated column and one Fh-treated column were then subjected to drying, followed by an additional 30 d of influent delivery. Although the influent was low in As (∼1 μg L) and the soil As level was normal, the total dissolved As concentration of effluent from the untreated columns increased with time, from ∼1 μg L to a maximum of ∼27 μg L. In contrast, effluent from the Fh-treated columns remained low in As (i.e. |
| Databáze: | OpenAIRE |
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