Publications by authors named "Signe Haukelidsaeter"
Article Synopsis
- * The study examined how backwashing impacts the microbial community and chemical composition in a dual-media filter of anthracite and sand while tracking the removal efficiency of Fe, Mn, and NH over time.
- * Results showed that backwashing improved Fe removal efficiency and led to a mixed microbial community across the filter layers, with specific microorganisms playing key roles in oxidation and nitrification processes.
Rapid sand filtration is a common method for removal of iron (Fe), manganese (Mn) and ammonium (NH) from anoxic groundwaters used for drinking water production. In this study, we combine geochemical and microbiological data to assess how filter age influences Fe, Mn and NH removal in dual media filters, consisting of anthracite overlying quartz sand, that have been in operation for between ∼2 months and ∼11 years. We show that the depth where dissolved Fe and Mn removal occurs is reflected in the filter medium coatings, with ferrihydrite forming in the anthracite in the top of the filters (< 1 m), while birnessite-type Mn oxides are mostly formed in the sand (> 1 m).
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