Swedish sewerage sludge treatment policy has a one-sided focus on phosphorous recycling. But nitrogen, potassium and sulfur are more important in both economic and environmental regards, says SIANI-associated researchers in a recent debate article in Dagens Nyheter.
The article has led to some discussion on plant nutrient recycling and its overall importance for fertilizer use and environmental goals. In a final reply on August 3, the researchers again stress that high amounts of mineral fertilizers end up in Swedish sewerage water (20% of N, 50% of P, and 55% of S), and that there is a high value in recycling not only phosphorous, but all these nutrients.
Read both articles here (in Swedish):
Photo credit: Steve Snodgrass