Uklanjanje željeza, mangana i H2S iz vode predstavlja važan zadatak u pročiščavanju vode, jer oni mogu graditi netopive hidrokside koji mogu ugroziti vitalne dijelove sistema za pročiščavanje. Obično je gornja granica sadržaja željeza u vodi za piće 0.3 mg/l, a mangana 0.05 mg/l.

Deferizatori rade na principu oksidacije otopljenog dvovalentnog željeza i mangana u njihov trovaletan oblik koji je netopljiv i separabilan.

Za potrebe formiranja deferizacijskih uređaja koristimo razne vrste filtracijskih medija u zavisnosti od osobina same vode i želja korisnika.

Koristimo filtracijske materijale kojima se radni vijek produžava regeneracijom ali i one koje je dovoljno samo protu strujno isprati.

• Zeleni pijesak - GS
• Birm - BI
• FMH - FMH
• Crystal Right - CR
• Pirolizit - PY

Iron equivalent (mg/l) = 1 x Fe index (mg/l) + 2 x Mn index (mg/l)
Determination of the Filtration velocity according to iron equivalent:
Iron equivalent Filtration velocity<0.2 mg/l 18 m/h

• 0.5 mg/l 15 m/h
• 1.0 mg/l 12 m/h
• 1.5 mg/l 10m/h
• 2.0 mg/l 8 m/h
• 3.0 mg/l 6 m/h

Required filtering surface (m2) = Flow rate (m3/h) / Filtration velocity (m/h)

• Birm capacity: 1,4gFe/l
• Backwash: 25-30m/h
• Bed depth: 75-90cm
• Water pH-range: 6,8 – 9,0

The solve oxigene index has to be 15% of the iron index.
The free chlorid index has to be lower than 0,5 mg/l.
The sulphurhydrogene has to be removed before the filter.

Iron equivalent (mg/l) =1 x Fe index (mg/l)+ 2 x Mn index (mg/l)+ 5 x H2S (mg/l)
Determination of the filtration velocity according to iron equivalent:
Iron equivalent Filtration velocity

• <0.2 mg/l 18 m/h
• 0.5 mg/l 15 m/h
• 1.0 mg/l 13 m/h
• 1.5 mg/l 12 m/h
• 2.0 mg/l 10 m/h
• 3.0 mg/l 8 m/h

Required filtering surface (m2) = Flow rate (m3/h) / Filtration velocity (m/h)
Important working conditions of Pyrolox:

• Backwash: 60-70m/h
• Bed depth: 45cm
• Water pH-range: 6,5 – 9,0
• Free volume: min. 40% of the bed depth
• Resistant opposite the clorine.

Iron equivalent (mg/l) = 1 x Fe index (mg/l) + 2 x Mn index (mg/l)
Determination of the filtration velocity according to iron equivalent:
Iron equivalent Filtration velocity

• <0.2 mg/l 18 m/h
• 0.5 mg/l 15 m/h
• 1.0 mg/l 12 m/h
• 1.5 mg/l 10m/h
• 2.0 mg/l 8 m/h

Required filtering surface (m2) = Flow rate (m3/h) / Filtration velocity (m/h)

Important working conditions of Green Sand:

• Backwash: 30-35 m/h
• Water pH-range: 6,2 – 8,5
• Bed depth: 600–900 mm
• Free volume: min. half of the bed depth
• The ongoing water should’nt contain oil or poliphosphats.
• Solution of regeneration: max.2,5 – 3 g KMnO4 / l water of KMnO4 solution tank
• KMnO4 solution: 10ºC water 30g KMnO4 / liter H2O

Capacity of BlueSoft CR = CR liter x 1,7

Determination of the ºdH capacity for the equipement:

• 1mg Fe = 1 ºdH , 1mg Mn = 1 ºdH
• ºdH + Fe (mg/l) + Mn (mg/l) = ºdH equivalent

Working conditions:

• pH-range: 5 – 14,0
• Total hardeness: > 2,9 ºdH
• TDS: > 80 mg/l
• CO2: < 40 mg/l

The regeneration of the charge is done with salt pills.