Added: Oct 01, 2020
Last edited: Aug 10, 2021
During a pilot study to decolour drinking water, Vitens discovered that the perceived waste stream removed actually contained humic acids and table salt. Vitens searched for a method to reduce the residual as much as possible and strive for a Zero Liquid Discharge (ZLD) operations. An extensive market scan showed that humic acids are valuable substances, with different market applications in agriculture and horticulture fertilizer, plant breeding and even as a supplement for animal nutrition.
The installation at Spannenburg will process the total residual of 4,100 m3 into 810 m3 per year. This residual comprises of less than 0.25% salt and 20% humic acid.