More efficient alkalisation with ground limestone in groundwater treatment

  title={More efficient alkalisation with ground limestone in groundwater treatment},
  author={Jarmo T Sallanko and Johanna Hietala and Robin Lindstr{\"o}m and A. Kyt{\"o}vaara and Timo V{\"a}is{\"a}nen},
Most Finnish groundwater must be alkalised before use as municipal drinking water because it is corrosive. The corrosiveness is due to low pH and softness of water. Groundwater also often contains aggressive carbon dioxide (CO2), so there is more free CO2 than is required to keep calcium and hydrogen carbonate in solution. The most popular alkalisation method in the past was addition of sodium hydroxide, but use of limestone (calcium carbonate) for alkalisation is becoming increasingly popular… CONTINUE READING

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