Waste-To-Energy

Project’s context & challenges

Rzeczyca Sp. z o.o. is a local company that processes agricultural waste and produces biogas. It owns and operates the Rzeczyca biogas plant, transforming organic materials into clean, renewable energy.

The plant uses heat from its combined heat and power (CHP) units for internal needs. It then uses the remaining energy to dry the solid fraction of the digestate, improving efficiency and sustainability.

Local farmers supply feedstocks such as grass, vegetable waste, distillery vinasse, and industrial by-products. The project focuses on sustainably managing these materials while generating green energy for the local power grid.

Nijhuis served as the general contractor, delivering the full technology package along with civil and electrical works, CHP units, and a direct connection to the grid.

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

Cedrob S.A., a leading poultry producer in Poland, aimed to become energy self-sufficient while reducing its environmental footprint. With multiple slaughterhouses, hatcheries, and feed production facilities, Cedrob needed a robust wastewater treatment and biogas recovery solution to handle complex and variable effluents. The goal: turn waste into value and meet stringent discharge standards.

Solution

Nijhuis Saur Industries (NSI), part of Saur Group, delivered a full-scale wastewater treatment and biogas plant for Cedrob. The system treats wastewater from slaughtering, poultry farms, and sanitation processes. It includes mechanical pre-treatment, dissolved air flotation, aerobic treatment, and advanced anaerobic digestion. The biogas is desulfurized and reused for heat production, while the digestate is dewatered and repurposed as fertilizer.

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.

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.