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Water quality keeps improving

  • By implementing the best available techniques for wastewater treatment, the sector has continued to reduce the chemical oxygen demand (COD) of its effluents, despite an increasing production. The decoupling between COD and production is going on and has reached a new record.
  • The sector has reduced its specific COD load by more than 90% since the reference year 1987.
  • Process wastewater in our sector is typically treated either in-house (about 40% of organic load) or in public wastewater treatment plants (about 60%) against payment of taxes.
  • Organic pollutants in effluent need oxygen to be completely chemically oxidized. Hence, the pollutant load of wastewater can be measured from the chemical oxygen demand (COD), expressed in tonnes of oxygen needed.