Facts & Figures

Wastewater typeMunicipal
LocationGermany, Altena
Operation start2021
Project typeRetrofit
Capacity9 MLD
Calculated capacity16,300 PE
Peak flow1080 m3/hour
Nereda reactors3 x 1,705 m3
Post-treatmentEffluent equalization
In the media--

About the Altena WWTP

Ruhrverband operates more than 60 wastewater treatment plants (WWTP) in North Rhine-Westphalia and cleans the wastewater of more than two million people and numerous commercial enterprises.


The challenge

The Altena WWTP in German Sauerland was built in 1984 for a capacity of 52,000 p.e. Over the years, the plant has deteriorated and the population it serves has increased substantially. To meet the increased demands on the plant, Ruhrverband identified that it needed to be replaced. However, limited space and access constraints at the site for heavy construction equipment, represented significant challenges.


The solution

Nereda® technology was selected due to its small footprint and high levels of robustness, as well as a lower operating cost and reduced maintenance requirements. The new plant will treat predominantly municipal wastewater, along with some industrial wastewater from the metal industry. Additionally, Nereda was chosen due to its excellent biological phosphorous and nitrogen removal qualities, with little or no chemical dosing.


The outcome

The new plant at Altena WWTP will serve a population of 72,000 p.e. Ruhrverband expects to improve current flow values, save significant cost on chemical use and reduce the energy demand by at least 30 percent. 







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The local benefits of the project

Nereda logo small Small physical footprint
Nereda logo small Cost effective
Nereda logo small Considerable energy savings
Nereda logo small Greater treatment capacity
Nereda logo small  Chemical cost savings