Degassing slurry in a biogas plant before it is spread in the field means, among other things, less odor nuisances, higher fertilizer value and less impact on climate.
A Danish farmer running a large pig farm and a biogas plant has invested DKK 14m in a pipe system to transport the slurry from local farms to the biogas plant and back to the fields where the degassed slurry is to be spread out. Knife gate valves are installed on manifolds between the farms and the biogas plant to ensure that the slurry is transported to the right places. Automated control of opening and closing the valves ensures that the slurry can be pumped in both directions in the system.
Pipe system for transporting slurry reduces traffic load
The farms being connected to the new pipe system save both time and operating costs. In addition, establishment of the system will also reduce the traffic load and the challenges related to this. Slurry tankers no longer need to drive back and forth between the farms and the biogas plant, and the need for driving back and forth between the fields and the storage tanks on the farms has also been minimised, because buffer tanks and taps have been established at the fields, .
Approximately 20 km of pipes connect 10 farms, a pumping station and the biogas plant, which processes up to 160,000 tons of biomass annually, and the pipe system results in a significant reduction of the traffic load.
Degassing results in less impact on climate and less odor nuisances
Slurry is pumped from the farms for degassing in the biogas plant, and then it is pumped back to the farms for storage in tanks directly by the fields. By degassing slurry before it is spread out, there will be several advantages. The degassed slurry provides a higher fertilizer value and the effect will be less odor nuisances and reduced methane emissions. Methane is a greenhouse gas that negatively impacts the climate far more than CO2, and thus the degassed slurry has less impact on climate.
Pipe system with 26 pcs. DN200 knife gate valves
The pipe system is dimensioned with 200 mm PE pipes and for a maximum pressure of 10 bar. Vatech 2000 has delivered 26 pcs. DN200 AVK knife gate valves with LINAK actuators (incl. motor/signal cables) for the project. Electrical actuators have been chosen because the valves are installed over a large area and to allow for feedback modules, which can provide an overview of the actuator settings.
Range of AVK knife gate valves
AVK valves for wastewater treatment withstand even the toughest conditions and last for decades. We deliver durable products that constitute the most cost-efficient solution in the long run.
See the range of AVK knife gate valves
Learn more about AVK knife gate valves
The design of our knife gate valves is simple and allows easy maintenance and cost-effective installation. The valves are bi-directional and allow installation without any restrictions as to the direction of the flow.
Go to insights