Byosis

Project’s 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.

Project’s context and challenges

The client is digesting agricultural feedstocks combined with a large portion of ‘dry’ chicken manure. The aim is producing biomethane to be injected into the grid. Because of the high nitrogen content in the feedstock the client’s challenge is preventing ammonium inhibition in the AD’s biology, and therewith stagnation of biogas production.  Simply diluting with fresh water isn’t feasible since this would result in unreasonable digestate discharge volumes.

Ammonium Control and Reuse  –  As the solution the thin fraction is drastically reduced in ammonium with the ByoFlex®2×10 system, after which the major part of the thin fraction is pumped back (recycled) to the front end of the AD to dilute the incoming feedstock.

End-of-Pipe – The remaining thin fraction is stripped because therewith it is being land applied on reduced land area (in the region) which significantly lowers transport and spreading costs.

Context

Wastewater (vapor condensate) from the digested sludge and the condensate from sludge drying, is drastically reduced in ammonium with ByoFlex® during the tourist peak periods on the island Rügen. The existing WWTP as a result can deal with increased hydraulic loadings, with reduced ammonium/ammonia concentrations. Herewith the Rügen plant is also ready for more stringent nitrogen emission levels in the future, without the need to expand the existing WWTP.

Solution

Byosis delivered and supervised the installation of the ByoFlex®5 unit, consisting of Stripping  column and 2 scrubber columns including heat exchangers with heat recovery. The system is configured to customer-specific parameters, such as the waste waters viscosity, variable throughput, dry matter content and the specific wastewater components. During the initial months of operation, Byosis ensures optimal and reliable performance by giving guidance on systems operation.

Context

A Dutch water board collects sludge from various wastewater treatment plants for processing in a digester to produce methane gas. The effluent from the digester is pretreated to reduce the ammonia load, thereby relieving the burden on the water treatment plant. The ByoFlex® Mobile unit has been tested to support a well-informed decision on how to replace the Anammox system.

Solution

Byosis installed the ByoFlex® Mobile unit for 3 months and tested the specific effluent in collaboration with the client. During the test period various scenarios are successful studied. Byosis is now, in cooperation with the client, configuring the final configuration.

Context

At a waste-to-energy plant in central Italy, a customer needed to pasteurize the digestate flow for further processing, while using a minimum amount of heat.

Solution

Byosis delivered and installed the ByoPast® unit consisting of 3 pasteurization vessels for a continuous flow of 10 m³/hr. The system was adapted to customer-specific parameters, such as the viscosity and dry matter content of the process water. During the initial months of operation, Byosis provided guidance on system operation and cleaning, as well as on ensuring optimal and reliable performance.