Because CH4 is generated from decomposition of organic matter under anaerobic conditions, it is reasonable to assume that CH4 emission would be minimized in compost that was continuously aerated.
Nitrous oxide emissions varied seasonally, with emission factors of 0.37% (g N2O/g N; CONT) and 0.45% (g N2O/g
N; LOW) in autumn and 0.58% (g N2O/g N; CONT) and 0.60% (g N2O/g N; LOW) in summer experiments with no difference between the manures.
The reduction in the manure’s global warming potential was even higher, with a 39.1% reduction of GHG (CONT:
219.0 g/d/head, LOW: 133.4 g/d/head). The N2O emission factor of the wastewater treatment system (about 1.8% g N2O–N/g
N) was 3.7 times that ofthe composting system with aeration (about 0.5% g N2O–N/g N). In addition, the amount ofN treated
by the wastewater treatment process (22.8 g/d) was 2.8 times that treated by the composting system (8.2 g/d). As a result,
6–10 times more N2O was generated through wastewater purification than through composting. Because this wastewater
purification system is widely used as a system for treating wastewater on swine farms in Japan, feeding a low CP diet is an
effective means for reducing GHG emissions from these farms.
Because CH4 is generated from decomposition of organic matter under anaerobic conditions, it is reasonable to assume that CH4 emission would be minimized in compost that was continuously aerated. Nitrous oxide emissions varied seasonally, with emission factors of 0.37% (g N2O/g N; CONT) and 0.45% (g N2O/gN; LOW) in autumn and 0.58% (g N2O/g N; CONT) and 0.60% (g N2O/g N; LOW) in summer experiments with no difference between the manures.The reduction in the manure’s global warming potential was even higher, with a 39.1% reduction of GHG (CONT:219.0 g/d/head, LOW: 133.4 g/d/head). The N2O emission factor of the wastewater treatment system (about 1.8% g N2O–N/gN) was 3.7 times that ofthe composting system with aeration (about 0.5% g N2O–N/g N). In addition, the amount ofN treatedby the wastewater treatment process (22.8 g/d) was 2.8 times that treated by the composting system (8.2 g/d). As a result,6–10 times more N2O was generated through wastewater purification than through composting. Because this wastewaterpurification system is widely used as a system for treating wastewater on swine farms in Japan, feeding a low CP diet is aneffective means for reducing GHG emissions from these farms.
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