Overland Flow for Iron Removal From Potable Water
John H. Zirschky, Liisa Carlson · American Water Works Association · 1984
Overland flow, an effective wastewater treatment process, can also be used for potable water treatment. Many groundwaters contain excessive amounts of ferrous iron that result in a water of poor aesthetic quality. The natural reaeration that occurs during overland flow oxidizes ferrous iron to the more insoluble ferric form. The resulting precipitate then settles on the slope. An existing overland‐flow treatment system in Salo, Finland, achieves 97 percent iron and manganese removal. A brief description of that treatment system is presented.