Water treatment

Our subsidiary Götaverken Miljö AB’s water treatment system is custom-designed for your specific needs.

We have managed all sorts of requirements to the system designs, the flue gas treatment, and water emission levels. With this experience we can help find the right water treatment solution for your plant.

Adding to the complexity is that the consumption of water and chemicals depends on the type of residue, water treatment, and degree of stabilisation that is required.

Basic sub-systems

  • When designing a water treatment installation there are some basic sub-systems we use, such as traditional sedimentation systems (neutralisation, flocculation, precipitation, and sedimentation)
  • Ion-exchanger systems
  • UF (ultra filtration)
  • RO (reversed osmosis)
  • Gypsum precipitation

Götaverken Miljö has designed the basic process of the water treatment systems at all their gas treatment installations.

Water treatment to I/S Vestforbrænding

Götaverken Miljö built a combined water treatment plant for I/S Vestforbrænding.

In the plant, scrubber water from four flue lines with a total flue-gas flow of approximately 400,000 Nm3/h is cleaned. The water treatment plant processes both the acid and the alkaline scrubber water, and includes gypsum formation, gypsum dewatering, and ash stabilisation using sulphide and hydroxide sludge.

What is the process?

The flue gases from the gas treatment lines 1-4, and now also line 5, are cleaned in the existing scrubbers installed by Götaverken Miljö AB in 1992. At the request of I/S Vestforbrænding, Götaverken Miljö AB has upgraded the plant with a total water treatment system comprising two identical lines.

The combined water treatment cleans the output water from both acid and alkaline scrubbers.
During the treatment process, controlled gypsum formation takes place in a separate process stage, with subsequent gypsum dewatering. For gypsum formation, the neutralized acid scrubber water is used, and is mixed with the output water from the alkaline scrubbers. Nominal gypsum production is 230 kg/h based on 100% TS. Following the gypsum separation, the water is treated with precipitation and flocculation chemicals, with subsequent filtration. Sludge from the precipitation stage is used to stabilize the fly ash with the “Bamberg method.”

Read more about water treatment.

If you are interested in hearing more about water treatment at waste-to-energy plants please contact Per Lindgren, per.lindgren@gmab.se, (+46) 708 964 682