a phosphonate-based cooling water treatment in canada

a phosphonate-based cooling water treatment in canada
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  • Why are phosphonates used in water treatment?
  • Phosphonates are multi-functional metal ion control agents. The unique combination of properties found in phosphonates makes them well suited to address many of the problems encountered in the use of water. Thus, they have become a widely used component in water treatment formulations.
  • Which phosphonates can be preconcentrated in a wastewater treatment plant?
  • Successful preconcentration of the phosphonates NTMP, EDTMP and DTPMP from natural waters or wastewaters was achieved using freshly precipitated CaCO 3. Recoveries at the 1 μM level were 95–102% for an influent sample of a wastewater treatment plant. 3.2. Concentrations in the environment
  • Do phosphonates remobilize during water treatment?
  • Phosphonates have a very strong interaction with surfaces, which results in a significant removal in technical and natural systems. Due to this strong adsorption, little or no remobilization of metals is expected. No biodegradation of phosphonates during water treatment is observed but photodegradation of the Fe (III)-complexes is rapid.
  • Are phosphonates biodegraded during water treatment?
  • No biodegradation of phosphonates during water treatment is observed but photodegradation of the Fe (III)-complexes is rapid. Aminopolyphosphonates are also rapidly oxidized in the presence of Mn (II) and oxygen and stable breakdown products are formed that have been detected in wastewater.