About the Nereda® WWTP DodewaardDodewaard is located in the province of Gelderland, in the centre east of the Netherlands.
The challengeAs a number of WWTP’s in the surrounding area of Dodewaard were reaching the end of their lifetime, the Dodewaard plant had to take on an increasing capacity year by year. In 2018, The Water Authority of Rivierenland decided to put a best value procurement tender to the market for the replacement of the old plant, in which the capacity could be more than doubled. However, there were two strict requirements for the new plant; It had to be energy neutral and it must fit on the same plot of land.
The solutionTo win this Design and Construct Contract, Eliquo Water and Energy selected Nereda as the most suitable technology and this became the winning tender. Nereda was both chosen because of its efficient energy consumption and small footprint. This made it possible to build the plant next to the existing plant, while keeping it in operation.
It is a contractual requirement to run the WWTP on the energy from a small solar park next to the plant. The reduced energy consumption of the Nereda plant meant that the size of the solar park could be small and built within the plot of land.
Additionally, the choice was made to give the existing aeration and settling tanks a new purpose, to not waste any resources. One tank will be used as a Nereda buffer tank and the other one as a storm water tank.
The outcomeThe new Dodewaard plant started operations in October 2020 without storm water buffer and Nereda buffer tanks. In June 2021 the full capacity of 70.000 p.e. became available, when the existing tanks were retrofitted to buffer tanks. The small solar park built next to the plant fully compensates for the energy consumption, fulfilling the goal of making the plant energy neutral.
Interview with Plant Operator