Sweden embraces Royal HaskoningDHV's innovative Nereda wastewater treatment technology

Posted: Friday 9th June 2017

In a first for wastewater treatment in Sweden, Royal HaskoningDHV's Nereda technology has been selected as the preferred solution for a new wastewater treatment plant in Stromstad.

Stromstad is renowned in Sweden as a proactive municipality that is always prepared to be innovative when it comes to improving its infrastructure. Jerry Johansson of the municipality of Stromstad, responsible for the wastewater plant said: "We needed to increase the capacity of its wastewater treatment works while reducing the operational costs and the energy consumption. Several different types of wastewater treatment technology were considered before being rejected in favour of Nereda, which is a natural sewage treatment process that purifies water without chemicals by using the patented aerobic granular sludge technology."

Located close to the Norwegian border, Stromstad is an increasingly popular holiday destination for tourists and the town's population swells enormously during the summer months, more than doubling the number of residents. As a result, the municipality knew that the new plant would need to be able to cope with widely varying volumes of wastewater. The plant also has to remain efficient during very cold conditions in the Swedish winter. Furthermore, Stromstad was seeking the most competitively priced solution in terms of operational costs over its lifetime, as well as its initial construction.

Project Manager Bert Bakker of Royal HaskoningDHV commented: "This technology has been tried and tested all over the world, from hot and arid conditions in South Africa to very cold winters in Poland so we knew that low temperatures in Sweden would not present a problem. It also can easily adapt between high and low volumes of wastewater. When it comes to long term running costs, Nereda is so efficient, particularly in terms of energy consumption, that it was by far the most competitive solution."

The construction phase of the project has started with the plant scheduled to be ready by June 2018. Econet Vatten & Miljeteknik has been appointed by the municipality of Stromstad to deliver and install all the mechanical equipment.

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