selective ion exchange

Selective ion exchange processes

Selective ion exchange resins are characterized by functional iminodiacetate groups with high chelating power, thus with high affinity with heavy metals.

This allows us to utilize selective ion exchange systems in several application fields:

  • “end of pipe” removal of residual heavy metals concentrations coming from chemical-physical wastewater treatment systems
  • direct treatment of wastewaters arriving from the electrodeposition treatments
  • selective removal  of heavy metals present in contaminated ground waters
  •  removal of interfering metal ions in the galvanic baths

TECN.A. has developed a large experience in using selective ion exchange resins, because we have worked for years in the P.W.B. field, whose wastewaters contain high levels of heavy metals (especially copper) in the complexed and ion form.

Our systems, properly dimensioned and in the right operating conditions, allow to respect the very strict limitations of disposal for Cu2+, Ni2+, Zn2+, Cd2+, Pb2+, also when complexes such as multivalent carbonic acids are present (oxalic, tartaric, citric, gluconic, ammonia, aliphatic amines (ethylenediamine, diethylenetriamine, triethanolamine), hydroxyalkylamines (quadrol, pluriol), alkyl phosphonic acids (turbinal)

The resins we utilize are resins of the highest grade and chelating power, with a selectivity scale that puts in the last places the calcium ion, so they are especially suitable as polishing resins after chemical physical treatment.



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