The initial treatment step involves pressure filtration. A natural process where the water is mixed with compressed air and goes through depth filtration. Impurities are captured through the carefully chosen filter media, including sand and anthracite. In combination also called a multi-media filter. This process leads to high water quality and efficient operation with minimal energy consumption.
The second treatment step involves ultrafiltration which similar to pressure filtration also use a natural filtration process. Ultrafiltration utilizes membrane technology, making it highly effective for filtration of water with diverse quality. This system can eliminate particles as small as 0.02 micrometers and serves as a physical barrier against bacteriological contamination.
The purified water is stored in a clean water tank and pumped to consumers using frequency-controlled pumps that ensure a consistent water pressure.
Clean water tank
The purified water is led to a clean water tank. The tank can hold 55 cubic metres, which corresponds to an average daily consumption. The treated water is referred to as secondary water, which can only be used for toilet flushing and laundry.
Consumers are supplied with the desired amount of water at a consistent water pressure from a completely traditional pumping system - all of which are frequency-controlled and can operate individually or together, with an emphasis on minimizing energy consumption.
Before the water is supplied to the citizens, it undergoes UV disinfection to ensure that the water is free of unwanted bacteria.
UV disinfection system
As an additional safety barrier to ensure that the water does not contain unwanted bacteria, a UV disinfection system is installed as the final treatment step. This system employs ultraviolet light (UV) at a specific wavelength to effectively inhibit microbiological growth (including bacteria, viruses, algae, and fungi) in water by disrupting the DNA of microorganisms.
The centralised secondary water solution is established and operated by Aarhus Vand, which means that the citizens of Nye can enjoy a sustainable lifestyle without the responsibility, expense and hassle normally associated with secondary water use. A professionally run centralised treatment plant guarantees safe operation and peace of mind for citizens.
The project is supported by the Danish Ministry of Environment and Food's Environmental Technology Development and Demonstration Programme (MUDP) and is carried out in collaboration with the following companies:
Design and delivery of the water treatment solution for secondary water.
The Nye neighbourhood is developed based on sustainable principles. People live in respect for nature and their surroundings. Therefore, new solutions have been devised in terms of resource consumption, environmental impact, transport and nature. The neighbourhood has approx. 15,000 inhabitants.