Project context and challenges
The client is collecting and digesting food waste on industrial scale, resulting in the production of biomethane which is injected into the grid. The digestate after digestion is separated and the liquid fraction is discharged via the city sewer. The client’s challenge was to select a robust and reliable waste water treatment solution which could deal with varying nitrogen loading after the digesters combined with varying hydraulic loadings, while maintaining the city’s stringent nitrogen emission levels.
The client chose to implement a ByoFlex® installation. The liquid fraction/wastewater from the digester, is drastically reduced in ammonium with the single ByoFlex® 20 unit. As result of the flexible operation window of the ByoFlex® 20 unit, the downstream MBBR is designed significantly smaller due to the reduced and stabilized ammonium/ammonia loading. As a result of this, the plant is able to consistently reach the stringent nitrogen emission levels.
