This is a demanding task, particularly for coffee manufacturers, as coffee production is very water intensive. In fact, the UN estimates that it takes?140 litres of water?to grow, process, and transport enough coffee beans for just a single cup (UN). 

Together with Alfa Laval, one coffee producer in Spain has significantly reduced its overall water consumption and is now saving thousands of litres of water every day by reusing cooling water previously lost to the drain. 

Founded in 1998, Prosol produces more than 13 million cups of coffee and coffee products a day and exports them to more than 30 countries around the world from its manufacturing facilities in Palencia, in the Castile-León region of northern Spain. 

A signatory to the UN Global Compact and with a strong focus on sustainability and circularity in its operations, the company identified significant potential for improvement in the amount of water used separation phase of the coffee production process where disc-stack centrifuges are in use. 

“We have always promoted sustainability,” explains Francisco Javier Cantero, technical and process manager at Prosol. “And today, it’s not an option: It’s a responsibility. Joining the Global Compact and promoting the Sustainable Development Goals is a major step towards improving the future of everyone.” 

At the time the company was scrutinizing potential water-reduction measures at its Palencia plant, 240 litres of fresh water every hour were going straight down the drain after completing the job of cooling the high-speed separator. This amounted to a total of 5,700 litres a day. 

So, as part of their drive towards reducing this high level of water consumption, Prosol reached out to Juan Miguel Comillas from Alfa Laval’s Global Technology Business Development in BU High Speed Separators. As luck would have it, the team was in the process of developing new technology – specially adapted for applications with cold media, such as brewery, beverage and dairy processes and now called Optiwia – that could recover this cooling water for reuse. 

Following testing during 2021-2022, the final commercial product was installed for use in 2024.   

“The Optiwia technology means that Prosol can recover the cooling water and use it to flush the machine after every discharge,” Juan Miguel explains. “Before, it was going to waste, but now, we are collecting it in a tank and reusing it.”  

Every day the company reuses the entire amount of recovered water of 5,700 litres - 2,040 litres are used in flushing, while the remaining is used as a cooling water supply, says Juan Miguel.  

“They are very happy at Prosol, and we now know that with Optiwia, food & beverage producers can save up to 70% of the total water consumption, and we can confidently say to the market that we supply the perfect centrifuge for all cold food applications with respect to water.”