The new Pushige Biomass Energy Center in Hualien County on the east coast of Taiwan is the first biogas plant in the country to use livestock manure as its feedstock, using a digester mixing system made by Landia.
The plant features six of Landia’s externally mounted GasMix systems, which enhance biogas yields. The 18.5 kw units are helping generate what will amount to approximately 876,000 kWh of electricity each year for the Taipower grid (equivalent to the electricity capacity of 250 households) from 300 tonnes of livestock manure wastewater every day in the breeding area of Sanmin, Yuli Town where eight livestock farms are home to almost 10,000 pigs and close to 700 cows.
Benefitting from the Landia Chopper Pump, the digester mixing system draws thick liquid from the bottom of the 6,000 m3 tank, where solids are chopped to accelerate the digestion process and prevent clogging of pipes and nozzles. In the first stage of the mixing process, the livestock wastewater is injected into the upper half of the digester, whilst biogas is aspirated from the top of the tank and mixed into the liquid. This reduces buoyancy at the surface of the liquid, and the rising gas bubbles continue to mix after the pumps are switched off.