tertiary treatment

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The main purpose of tertiary treatment is:

  • colour removal;
  • hard COD and suspended solids reduction.

The following are the most frequently used techniques:

  • coagulation-flocculation with the negative impact of additional costs for reagents and processing additional sludge output;
  • ozonation or ozonation followed by the BIOFOR (Oxyblue) which presents a number of advantages:
    • compactness;
    • high efficiency;
    • little or no sludge production;
    • when ozone is produced from pure oxygen, the excess oxygen is recovered and re-injected into the biological aeration tank, thus reducing aeration power consumption.
treatment textile industry colour removal Secured image
Figure 50. General treatment scheme for the textile industry, with thorough colour removal