In order to increase the use of biogas plants in Korea, a farm-scale biogas plant with a working volume of 200 m3
was
constructed at the pig farm in Sung Hwan, Korea as a demonstration project supported by the Korean government. This
plant mainly consists of an anaerobic digester processing daily 10 m3
pig manure and a dual-fuel engine-generator to
produce heat and electricity. Digestion takes place in a semi-continuous, single stage, completely stirred anaerobic
digester under mesophilic temperatures with maximum 0.8℃ deviation per day from the setting temperature of 35℃.
The digester was constructed as cylindrical flat-bottomed tanks instead of general conical bottoms. But it did not cause
any serious mixing trouble. The results of solids profiles and temperature profiles inside the digester showed very small
variations, which mean adequate mixing performances. During anaerobic digestion, 55% of volatile solids (VS)
reduction in average was stably achieved. However no further VS reduction was occurred due to its inherent nonreadily
biodegradable materials. The average biogas yield was 0.70 m3
per kg of added volatile solids. The biogas
composition was relatively constant for the entire run with the 68-73% methane(V/V) and 27-30% carbon dioxide(V/V).
The produced biogas was effectively used in a dual-fuel engine-generator to produce heat and electricity.
In order to increase the use of biogas plants in Korea, a farm-scale biogas plant with a working volume of 200 m3 wasconstructed at the pig farm in Sung Hwan, Korea as a demonstration project supported by the Korean government. Thisplant mainly consists of an anaerobic digester processing daily 10 m3 pig manure and a dual-fuel engine-generator toproduce heat and electricity. Digestion takes place in a semi-continuous, single stage, completely stirred anaerobicdigester under mesophilic temperatures with maximum 0.8℃ deviation per day from the setting temperature of 35℃.The digester was constructed as cylindrical flat-bottomed tanks instead of general conical bottoms. But it did not causeany serious mixing trouble. The results of solids profiles and temperature profiles inside the digester showed very smallvariations, which mean adequate mixing performances. During anaerobic digestion, 55% of volatile solids (VS)reduction in average was stably achieved. However no further VS reduction was occurred due to its inherent nonreadilybiodegradable materials. The average biogas yield was 0.70 m3 per kg of added volatile solids. The biogascomposition was relatively constant for the entire run with the 68-73% methane(V/V) and 27-30% carbon dioxide(V/V).The produced biogas was effectively used in a dual-fuel engine-generator to produce heat and electricity.
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