Source separated wastewater systems enable a circular economy through the return of plant nutrients, reduced water use, reduced energy use, increased biogas production and reduced greenhouse gas emissions.
Sweden Water Research conducts research into water and develops new, effective solutions to meet the future challenges facing the water services industry.
We create, run, participate in and initiate projects that seek out suitable partnerships, with the ultimate aim of increasing knowledge of successful methods for the development and climate change adaptation of the cities of the future. Projects within Sweden Water Research are run in close collaboration with the owner municipalities and will, in either the short or the long term, benefit day-to-day operations.
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Sweden also has a water shortage some summers. In 2018, more than 80 municipalities needed to introduce restrictions on water use. With source-sorting sewage technology, the possibility of using greywater for irrigating green areas is opened up.
The world food supply is entirely dependent on the use of fertilisers. However, the current fertiliser production practices are not sustainable. Domestic wastewater is an important carrier of resources: especially water, energy and nutrients. In the current centralised wastewater management systems these resources are hardly recovered.
Straw has an untapped potential for domestic biogas production of at least 4.3 TWh.
The NPHarvest process consists of a pre-treatment process for ballasted sedimentation with lime for removal of particles and recovery of phosphorus as well as nitrogen recovery by ammonia stripping with hydrophobic gas-permeable membranes. The new process has low energy requirements, and uses standard chemicals. The products are pure ammonium salt and hygienically solid material containing phosphorus.
Cultivating urban bazaars is an innovation project whose goal is to build a small-scale, sustainable industry through urban cultivation that creates new jobs and the opportunity to reach out to start-up companies focused on innovative environmental technology.
Recycling of nutrients from wastewater in Sweden today takes place almost exclusively by spreading sludge on arable land. But what are the alternative options for recycling nutrients from wastewater streams?
In 1981, field trials were started to investigate the short- and long-term effects of the spread of municipal sewage sludge on arable land. Initially, there were five test fields, but for a long time the project has been concentrated on two of them: Igelösa outside Lund, which receives sludge from the Källby Wastewater Treatment Plant (WWTP), and Petersborg outside Malmö, which receives sludge from the Sjölunda WWTP. The project has so far had nine stages of four years each. The period 2018-2021 will be the tenth stage of the project.
Is the use of municipal sewage sludge on arable land a spreading route for PFAS?
Supply of digested sewage sludge to arable land provides significant carbon storage in the soil and thus contributes to reduced greenhouse gases in the atmosphere.
Pyrolysis of dried sewage sludge generates a sludge biochar that can be used in several applications. VA SYD participates in the project Residues to best use to increase its knowledge about biochar and its possibilities.
Seven water and wastewater service organisations, together with two research institutes, have evaluated the conditions for opening up municipally owned wastewater treatment plants to test techniques for recovering nutrients from wastewater streams.