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COD removal with ozone

Process description

Not all waste water can be cleaned sufficiently in a biological waste water treatment plant. Industrial waste water requires a supplementary treatment when it contains organic compounds which are difficult to break down, colourants or toxic substances. Municipal waste water needs additional treatment to remove so-called “micro-pollutants.

Gas application

The strong oxidising agent ozone eliminates many problematic substances totally, or oxidises them to the extent that they can then be treated biologically. Supplementary treatment with ozone is carried out before or after biological cleaning.

Ozone consists of three oxygen atoms and is seen as one of the strongest oxidising agents. Nevertheless, it reacts to form relatively unproblematic oxidation products and oxygen and does not lead to salting up of the treated waste water.  Depending on the task, ozone is used for direct and specific reaction with individual wastewater constituents or, in the so-called Advanced Oxidation Process, for the formation of extremely reactive but non-selective OH radicals. Ozone cannot be stored and so must be produced on site from oxygen in ozone generators.  

The advantages of ozone treatment at a glance:

  • Increases COD breakdown rate 
  • Ensures compliance to limits consent levels and annual loads for COD, colour, and other sum parameters.
  • Avoids salination of water and facilitates the reuse of treated water   
  • Eliminates micro-pollutants

Messer solution

With experience and know-how, Messer ensures that you can take full advantage of the benefits of an ozone treatment with pure oxygen supply at your waste water treatment plant. For this purpose Messer offers:

  • Complete pilot plants for feasibility studies on a laboratory scale
  • Experiments in expert laboratories
  • Oxygen storage and oxygen supply
  • Ecovap evaporator for an environmentally friendly and cost-effective use of the inherent coldness of cryogenic oxygen
  • Supervision of the tests and commissioning
  • Support from our national and international experts