Water with higher iron concentration must be treated. Water containing iron is generally reduced- or low-oxygen water in which the iron is usually dissolved in bivalent form. Compressed air or oxygen is mixed with the raw water upstream of the filter to oxidise the iron. The bivalent iron oxidises with oxygen and forms undissolved rust, which is held back in the filter bed. The held back iron leads to an increase in the differential pressure in the filter. Back-flushing generally occurs, depending on the throughput.
An extremely effective iron removal method remains the classical multi-layer filtration with preceding oxygen enrichment - in particular at high iron concentrations in raw water. Iron results in good flocculation that can be separated excellently. In the case of organically bound iron ozone may be necessary for oxidation. The use of membrane systems to remove iron can be considered in case of lower iron contents.
Tel. +49 751 6009-47
Tel. +49 5241 9760-56