Abstract
This study was conducted using natural waters to determine the influence of biochemical and chemical changes on the removal of iron during filtration. It was conducted using a pilot plant at Clinton, Illinois, where there have been problems with iron removal. The continuous flow pilot plant was designed to include an integrated series of unit operations. Aeration was accomplished by using diffused air in a multiple‐pass aerator. At various stages of treatment, analyses were performed for alkalinity, hardness, pH, oxidation‐reduction potential (ORP), temperature, total dissolved solids, chlorides, nitrates, nitrites, ammonia, total iron, filterable and total ferrous iron, dissolved oxygen, chemical oxygen demand, organic nitrogen, bacterial count and chlorine demand. All analyses were performed as per Standard Methods except for the two forms of ferrous iron and ORP.
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