CLEAN core member City of Aarhus and the utility company Aarhus Water has bold ambitions for the city to be at the forefront. In line with the ambitions of the Energy in Water project, Aarhus Water is taking these ambitions to new highs as a showcase and an example of what is actually possible, with technologies that have a payback time of less than 5 years.    

Water and wastewater facilities are usually high energy consumers. Typically water and wastewater-treatment processes account for 25 - 40 percent of the municipality's electricity bill - energy that can be saved and money that can be freed up and put to better use elsewhere. The answer lies in understanding that the technology and knowledge is available to make water-management systems energy neutral. In 2015, Marselisborg WWTP had a total energy production of 9,628 MWh/ year and an energy consumption of 6,311 MWh/year, equivalent to a net energy production of 153 percent (2015) . Most of the installed technologies have a payback time of less than 5 years. Over the past five years Aarhus Vand has put great focus on energy savings and energy production. At Marselisborg Wastewater Treatment Plant we have implemented energy-saving technologies such as an advanced SCADA control system, a new turbo compressor, sludge liquor treatment based on the anammox process, as well as optimised the fine bubble areation system. This has resulted in a reduction in power consumption of approximately 1 GWh/year which corresponds to about 25 percent in total savings.

For information: http://www.aarhusvand.dk/international

Video: https://www.youtube.com/watch?v=2P4G0HP08iQ&feature=youtu.be&list=PL5yt…