Facts & Figures
|Client||Water Authority Vallei & Veluwe|
|Location & start-up||Epe, The Netherlands, 2011|
|Average capacity||8,000 m3/day │ 54,000 p.e. (54 g BOD) inclusive 13,750 p.e. from industrial discharges|
|Peak Flow||1,500 m3/hour|
|Pre-treatment||screening, sand trap and oil &grease removal (to cope with slaughterhouse emissions)|
|In the media||water-technology.net|
About the Epe Nereda WWTP
The first Dutch municipal full-scale plant was constructed at Epe WWTP. The Epe WWTP was designed and constructed by Royal HaskoningDHV in 2010-2011 and is operational since September 2011. Prior to design, a pilot trial was carried out for four years and the data was used to design the full scale plant. The plant consists of the following main processes; inlet works with screens and grit removal, followed by three Nereda reactors and effluent polishing via gravity sand filters. The Nereda reactors are designed to take flows with an average daily flow of 8,000 m3/day and a peak flow of 1,500 m3/hour. The waste sludge is thickened via a gravity belt thickener and transported off-site. Pre-treatment: screening, sand trap and oil &grease removal (to cope with slaughterhouse emissions).
Image: Overview of the Nereda wastewater treatment plant in Epe
Results are exceeding expectations
After 16 months the first results were reported. It was already clear Nereda has a very small footprint (up to only 25% compared to conventional technologies) and is more cost-effective than conventional systems (savings more than 25% in investment and operational costs). With 16 months of successful operation the Epe WWTP also proves now Nereda’s sustainable character.
Extensive monitoring of the Epe plant, shows that the performance of Nereda even exceeds expectations. The energy consumption of the WWTP including sand filtration and sludge treatment is significant less than any type of similar-sized conventional treatment plant in the Netherlands. Furthermore the effluent quality meets the highest standards in The Netherlands, achieving total Nitrogen and Phosphorous concentrations lower than 5 and 0.3 mg/l.
High biological sludge loads
Remarkably is the observed robustness and stability of the treatment process under strong varying influent load conditions and extreme influent pH fluctuations. Another interesting observation is that even at wintry conditions extensive nitrogen removal could be established at surprising high biological sludge loads.