Assessments of Biogenic Gas Emission Processes in Cowsheds
Rolandas Bleizgys, Ligita Baležentienė
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Aleksandras Stulginskis University, Studentų 11, LT-53361 Akademija,
Kaunas r., Lithuania
Pol. J. Environ. Stud. 2014;23(4):1107–1114
Microclimatic factors rendering gas emissions from manure were evaluated during the four seasons throughout a year. The most favorable microclimatic conditions for the highest bacterial activity which fostered the NH3 emissions from manure were observed in the insulated cowsheds. The temperature did not fall below 2.1ºC, whereas it rose up to 26.9ºC during summer, thus resulting in high air humidity. The most favorable microclimate is that of a cold cowshed: -14.1ºC to 29.5ºC, with the relative humidity fluctuating within the desirable limits even in the cold period. In a cowshed, the main air pollutant is NH3; as for the other harmful gases, relatively low emissions were observed. The maximal rates of NH3 emission were observed from surfaces littered with liquid manure as well as in loci where the urine accumulated. The highest NH3 emission was observed from the floor littered with a liquid manure near the parlor – 342±21 mg·m-2·h-1 in a semi-deep cowshed. The following NH3 emission factors per livestock unit (LU) per day (d) were estimated: box-type cold – 21.9±3.2 g (LU d)-1, partially insulated box-type – 32.1±3.7 g (LU d)-1, semi-deep cowshed – 30 8±4.3 g (LU d)-1, and tie-cowshed – 27.4±2.9 g (LU d)-1.