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Table 2

Nereda® configurations

Nereda® ConfigurationTypical LayoutConfiguration characteristicAdvantagesReference examplesPotential Applications
Continuous feed, 3 + reactors 3 reactors  At least 1 reactor in feed phase at any given time Scalable for application to large (>100 ml/d) and mega (>500 ml/d) treatment plants Epe STP (Netherlands)
 
‘Greenfield sites’; or extension to existing plants with parallel Nereda® system 
Influent buffer followed by X reactors 1 buffer +2 reactors  Buffer stores influent between feeds to reactors Optimised investments (2 versus 3 reactors) Wemmershoek STP (South Africa)
 
‘Greenfield sites’; or extension to existing plants with parallel Nereda® system 
Hybrid 1 or more Nereda® reactors with excess sludge connection to activated sludge system  Waste Nereda® sludge to activated sludge system Enhance activated sludge system performance; Optimal use of existing infrastructure Vroomshoop STP (Netherlands)
 
‘Brownfield sites’;
Extension/optimisation scenarios, utilising existing infrastructure 
Retrofit Convert existing continuous activated sludge reactor, SBR or any suitable tank  Use existing tanks or CAS reactors Cost-effective capacity and performance enhancement using existing infrastructure Frielas STP (Portugal)
 
‘Brownfield sites’; Limited space or budget but require enhanced capacity and/or performance 
Nereda® ConfigurationTypical LayoutConfiguration characteristicAdvantagesReference examplesPotential Applications
Continuous feed, 3 + reactors 3 reactors  At least 1 reactor in feed phase at any given time Scalable for application to large (>100 ml/d) and mega (>500 ml/d) treatment plants Epe STP (Netherlands)
 
‘Greenfield sites’; or extension to existing plants with parallel Nereda® system 
Influent buffer followed by X reactors 1 buffer +2 reactors  Buffer stores influent between feeds to reactors Optimised investments (2 versus 3 reactors) Wemmershoek STP (South Africa)
 
‘Greenfield sites’; or extension to existing plants with parallel Nereda® system 
Hybrid 1 or more Nereda® reactors with excess sludge connection to activated sludge system  Waste Nereda® sludge to activated sludge system Enhance activated sludge system performance; Optimal use of existing infrastructure Vroomshoop STP (Netherlands)
 
‘Brownfield sites’;
Extension/optimisation scenarios, utilising existing infrastructure 
Retrofit Convert existing continuous activated sludge reactor, SBR or any suitable tank  Use existing tanks or CAS reactors Cost-effective capacity and performance enhancement using existing infrastructure Frielas STP (Portugal)
 
‘Brownfield sites’; Limited space or budget but require enhanced capacity and/or performance 
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