The membranes will be able to treat more wastewater over a smaller area, and the water will be cleaner than it is at present.
Membrane technology is a very efficient way of removing both nitrogen and phosphorus. We will also meet future environmental requirements for Stockholm's wastewater treatment by a decent margin, and so water quality in Lake Mälaren and the Baltic Sea will improve.
Another advantage of membranes is that they do not allow particles and particle-bound contaminants to pass through. This will make it possible in future to aftertreat and treat wastewater further to remove bacteria, viruses, microplastics and drug residues.