Motion Control & Drives


Danfoss addresses the challenges in water and wastewater applications

July 2020 Motion Control & Drives

As the world population rises and people pursue higher standards of living, more water is needed in homes and for the production of food and other products. By 2050, the United Nations projects global water demand to increase by 55%. However, freshwater supplies are limited, and groundwater, which is the source of drinking water for at least half of the global population, is used much faster than it is replenished. In just 10 years, 50% of the global population is expected to live in water-stressed areas.

Danfoss has solutions which help countries and municipalities worldwide save water and energy within water supply, wastewater treatment and irrigation of farming areas. For example, the company has supported Denmark in becoming one of the pioneering countries in the water and energy field. The country has grown its economy by 80% since 1980, while reducing water consumption by nearly 40%, and keeping energy use at the same level. Structured water management and innovative technologies have contributed to this decoupling of economic growth, water consumption, and energy use.

Electricity and heat production

In municipalities, water and wastewater facilities account for the largest consumption of electricity, typically 25-40% of the total power use. In the Danish city of Aarhus, a local water company has managed to transform a wastewater facility from being just a wastewater plant into also functioning as a combined heat and power plant, delivering an energy surplus. The plant produces 90% more energy than it consumes. The excess heat is led into the district heating system in the city, thereby reducing its carbon footprint. This is feasible thanks to advanced process optimisation and by using more than 140 variable speed drives from Danfoss as control handles on almost all rotating equipment. Done optimally, this also creates the maximum amount of sludge and carbon. In a digester, this is transformed into gas used for both electricity and heat production.

“It’s a ground-breaking innovation that shows what is possible with advanced process control,” says Ferdie Fortuin, sales manager, general industry, at Danfoss Drives South Africa. “As far as we know, no other country has managed to get a water treatment plant to actually produce so much additional energy based on normal household wastewater. It means that the huge energy consumption from water and wastewater facilities could be avoided, turning the single largest electricity consumer in municipalities into an energy-neutral party.”

The case has attracted attention in cities worldwide. At the beginning of 2015, Aarhus Water signed a cooperation agreement with the water supply company in Chicago (MWRD), which faces the same kind of challenges and pursues the same goals. With the agreement, they have started to share knowledge about water technologies, climate adaption and energy neutrality.

Irrigation of farming areas

When it comes to water supply and irrigation of farming areas, another huge potential is the reduction of water losses in pipework due to leakage. According to the international consultancy firm McKinsey, $167 billion is wasted every year due to leakage in cities around the world. However, leakages can typically be reduced by 30-40% using technologies like variable speed drives and sensors, which control the pressure in the pipes to avoid water flooding out of holes.

“The global water and climate challenges are a difficult code to crack, but the solutions to meet them are ready and we also see that focus on leakage reduction and energy efficiency is increasing,” explains Fortuin. “Last year, we experienced double-digit growth in our water and wastewater business, and the positive trend continues.”

Besides saving water and energy in countries and municipalities, Danfoss is also helping produce drinking water in remote locations like islands, drilling platforms and cruise ships. Here, Danfoss takes part in turning seawater into drinking water using advanced high-pressure pumps and energy recovery devices for desalination systems. The Danfoss solutions save up to 50% energy, which is important for the deployment because around 70% of the total costs in desalination systems are related to energy use.

Fortuin concludes: “The World Economic Forum ranked water crisis and failure of climate change adaption among the top 5 global risks and encouraged decision-makers worldwide to take collective action to address them. There is no reason to wait. Well-proven solutions, which meet the water and climate challenges, are ready and they are paid back fast.”

For more information contact Lynne McCarthy, Danfoss, +27 11 785 7628, mccarthyl@danfoss.com, www.danfoss.co.za


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