On a global scale, less than half of all wastewater is collected and less than one fifth is treated. This and the threat of water scarcity underline the need for more efficient and smarter wastewater treatment across the world. This white paper provides lessons learned from Danish stakeholders within wastewater treatment.
The lack of proper wastewater treatment can result in severe environmental degradation of inland and sea waters around the world. Water scarcity and population growth, furthermore, underline the importance of treating and understanding the value of wastewater.
Energy producing wastewater treatment plants
Approximately 2 per cent of the world’s total energy consumption is used for collecting and treating wastewater.
In Denmark 2-3 per cent of the country’s total energy use relates to wastewater.
As a result, most Danish wastewater treatment plants have invested in an assessment of different ways to reduce their energy consumption and are increasingly focusing on energy production. As a next step, some water utilities are also looking into recovering the heat from the wastewater before it is discharged with the additional benefit of reducing the temperature impact on the receiving waters.
Using wastewater as a resource
Considering wastewater a resource is a relatively new perspective. However, today it is widely recognised that the organic content in the wastewater can be a resource for energy production and phosphorus can be used for fertiliser production with several advantages compared to the application of sewage sludge on agricultural land. Finally, the water itself can be cleaned to such high standards that it can be reused in a number of ways – e.g. for flushing toilets, laundry machines or irrigation for crops.
Find inspiration for your own wastewater projects
This white paper features lessons learned from different Danish stakeholders within wastewater treatment. It is meant to serve as a tool for inspiration for reaping the benefits of using wastewater as a resource.