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Title: Methane losses from floating gasholder type biogas plants in relation to global warming
Authors: Khoiyangbam, R S
Kumar, Sushil
Jain, M C
Keywords: Biogas plant
Floating gasholder
Global warming
Greenhouse gases
Methane losses
Slurry pit
Issue Date: Apr-2004
Publisher: CSIR
Series/Report no.: <b style="">Int Cl.<sup>7</sup>: G 01 W 1/100, C 01 B 3/02</b>
Abstract: Methane losses from uncovered portion of cattle dung slurry in biogas plant of various capacities (3, 6, 9, and 85 m<sup>3</sup>) are measured using closed chamber method. Measurements are conducted from January to December 2002 during a year. Mean methane flux from different exposed areas of a biogas plant of 3 m<sup>3</sup> capacity are: (i) Inlet/outlet pipes; 70 g/m<sup>2</sup>/d, (ii) Around gasholder; 87 g/m<sup>2</sup>/d, and (iii) Slurry tank; 41 g/m<sup>2</sup>/d, and increased by 15-20 per cent with the increase in plant capacity to 85 m<sup>3</sup>. Seasonal variation of slurry temperature strongly affects the methane emission. Emission rates during the summer are found to be high (125, 179, 230 and 230 g/m<sup>2</sup>/d, respectively, from the holder side of 3, 6, 9, and 85 m<sup>3</sup>) at slurry temperatures near optimum mesophilic range (32°<sup> </sup>C during June) and drop down considerably (68 to 79 per cent) during winter at slurry temperatures in the lower psychrophilic range (13°C in December). The correlation coefficient between the CH<sub>4</sub><sup> </sup>flux and the slurry temperature is found to be positive (between 0.90 and 0.96) and significant.<b style=""><i style=""></i></b>
Description: 344-347
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Appears in Collections:JSIR Vol.63(04) [April 2004]

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