30-50% energy savings: no use of chemicals
Extensive life cycle analyzes reveal Nereda as a truly sustainable technology. Compared to conventional wastewater treatment processes, Nereda not only has significantly lower energy consumption and associated greenhouse gas emission, but also produces, commonly without the use of waste generating chemicals, a remarkably high effluent quality. In addition, the technology requires fewer construction materials and less mechanical equipment resulting in a better environmental construction profile and a small physical footprint.
- Remarkably high effluent purity
- Pure biomass
- No/minimal waste generating chemicals
- Significantly lower energy consumption (up to 50%)
- Compact - Less construction materials required
- Small footprint
- No odor
Examples of energy savings
Nereda generates energy savings of up to 50% compared to conventional BNR activated sludge. This is achieved in two ways.
- Nereda requires a lower amount of mechanical equipment. (e.g. Nereda does not require return sludge pumps, mixers in anaerobic tanks, mixers in selector tanks, propulsion in activated sludge reactors). The energy savings from reduction in mechanical equipment are typically in the range of 25-35%.
- On top of that, additional energy savings of typically 30% are achieved from a reduction in air requirements. This is achieved by the difference in bacterial behavior (substrate and oxygen utilization) between flocs and granules.
Full-Scale Power Consumption Data from Garmerwolde WWTP (Nereda runs in parallel to CAS) showing 50% energy savings
Aeration efficiency versus CAS at Frielas WWTP in Lisbon, Portugal
- Approx. 30% less aeration than parallel operated CAS.
- Up to 50% less energy considering also savings on settler and recirculation pumps