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Emergency Water Treatment with Ferrate(VI) in Response to Natural Disasters

Abstract

Frequency and magnitude of natural disasters (e.g. hurricanes) increased globally over the past century. Clean water is a top priority for disaster-affected populations. However, existing emergency water treatment (EWT) methods are not all feasible or technically effective at many emergency situations. The recent Puerto Rican water crisis after Hurricane Maria highlights research needs and new challenges for new EWT technologies. In this study, bench scale experiments were carried out to evaluate ferrate(VI) for the treatment of simulated disaster-polluted water. Results show that ferrate(VI) treatment could simultaneously and effectively inactivate bacterial indicators, remove metal and metalloid contaminants, degrade dissolved organic matters, and reduce turbidity, while insignificantly increasing total dissolved solids (TDS) to ensure an acceptable TDS ≤ 1,000 mg/L (the recommended minimum TDS standard for emergency water supply). Ferrate(VI) dose played a key role, because it directly influenced the removal efficiencies and also affected size distributions of iron and metal/metalloid contaminants after treatment. As ferrate(VI) dose increased, the fractions of soluble and colloidal iron and metal/metalloid contaminants decreased, while their particulate portions increased, implying that the contaminants were associated with ferrate(VI) resultant iron particles. Therefore, an increased ferrate(VI) dose could accelerate the aggregation of fine iron particles, thereby facilitating the removal of associated toxic metals and metalloids in ensuing solid-liquid separation. Ferrate(VI) opens a new opportunity for EWT to provide safe and sufficient water for disaster-affected populations and rapid disaster relief. The knowledge can also be applied to ferrate(VI) treatment design for municipal water treatment and reuse, supporting urban water sustainability.

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Publication details

The article was received on 04 Nov 2017, accepted on 06 Jan 2018 and first published on 08 Jan 2018


Article type: Paper
DOI: 10.1039/C7EW00467B
Citation: Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript
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    Emergency Water Treatment with Ferrate(VI) in Response to Natural Disasters

    J. Cui, L. Zheng and Y. Deng, Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C7EW00467B

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