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Neutralisation of Waste Water

Process description

Alkaline wastewater is produced in a wide variety of industrial facilities. Relevant quantities of these effluents must be neutralised before being discharged into a sewage treatment plant or surface water. Many neutralisations still use mineral acids.  

Gas application

Today, safe and economical neutralisation of alkaline wastewater is carried out with carbon dioxide (CO2). The environmentally friendly carbon dioxide prevents over-acidification and increased salt content of the water.  

Advantages of CO2 compared to mineral acids:

  • Safe and simple pH-control; over-acidification is not possible
  • No handling of dangerous, aggressive acids 
  • No pungent vapours and no corrosion of the surrounding plant equipment  
  • No increase in salt content; relevant for discharge approval    
  • Lowers corrosion risk when re-using treated water 
  • No investment costs for acid storage   
  • Low operating costs

Messer solution

Messer's Neutra Process allows the safe and economical neutralisation of alkaline wastewater with carbon dioxide. For the rapid and complete dissolution of CO2 into water, Messer supplies the technology that best suits the local conditions and actual CO2-consumption. Our broad Neutra Portfolio ranges from injection lances with nozzles for gaseous or liquid CO2, to tube reactors and the Neutrabox technology for the injection of liquid CO2.  For new neutralisations and in retrofits of existing plants Messer determines the CO2 demand, draws up a process proposal and supplies the entire CO2 plant, hardware for injection and dissolution included. Retrofits can also be tested on a trial basis. Of course, every commissioning is supervised by our experts.