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Field studies were conducted to evaluate the feasibility of an in situ formed Fe–Mn binary oxide (in situ FMBO) for improving arsenic (As) removal in the aeration-direct filtration process. The transformation and transportation of As, Fe, and Mn in the filter bed were also investigated. The in situ FMBO increased the As removal efficiency by 20–50% to keep the residual As below 10μg/L. The optimum...
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