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Viguria et al ggaa 2013

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Viguria et al ggaa 2013 Viguria et al ggaa 2013 Document Transcript

  • Short-term nitrous oxide emission after turning of composting cattle manure Viguria, M.1*, López, D.M.1, Alberdi, O.1, Arriaga, H.1, Merino, P.1 1NEIKER-Tecnalia, Environment Quality Department, 48160, Derio (Bizkaia), ES *Corresponding author: mviguria@neiker.net INTRODUCTION 10th April to 24th April 2012 in the North of Spain. Turning: 13th April 2012. MATERIAL & METHODS Table 1. N2O measurement characteristics. RESULTS Acknowledgment. This work was cofinanced by the Ministry of Science and Innovation (INIA. RTA 2011-00107-C02-01) AERATION Manure heap turning Increase in polluting gases emissions N2O losses (nitrification, denitrification) Important factor in manure composting Objective: to asses the effect of turning on N2O emission during on-farm composting of beef and dairy cattle manure. Frequency 1st week: daily. 2nd - 3rd week: once/week. Methodology 4 closed chambers/pile. 3.8 l volume, 314 cm2 area. Sampling 0, 20, 50 min after chamber closure. Collected in 9 ml gas vial. Concentration Gas chromatography (GC-7890A, Agilent). Emission Slope of the linear regression (R2>0.90) between concentration and time. Figure 1. (a) Beef and dairy cattle manure heaped since December 2011 (Bd and Dd, respectively) and dairy cattle manure heaped since March 2012 (Dm).; (b) Gas sampling by closed chamber. Manure (15 cm depth) and air temperature recorded by 2 thermocouples/pile (TCdirect) and a datalogger (HOBO U12-13), respectively. Unaltered manure sampled 1 hour before and after turning for density analysis. Statistical analysis: repeated measurements of N2O emission during 8 measuring days (SPSS 15.0). Bd Dm Dd Figure 2. N2O emission and temperature (ºC) during the study. Turning was carried out on day pointed by an arrow. Bd Dd Dm Density before turning (g l-1) 768 (122) 918 (91) 812 (57) Density after turning (g l-1) 767 (49) 914 (109) 504 (100) N2O peak (mg m-2 d-1) 0.0 21.4 (29.2) 80.8 (86.2) Cumulative N2O (8 days) (mg m-2) 8.7 52.4 157.7 Table 2. Density and N2O emission for Bd, Dd and Dm manure. Mean (standard deviation). (b) (a) Density in Dm decreased 38% after turning (p<0.05).  Nitrous oxide emission from dairy cattle manure decreased to background levels 2 days after turning. CONCLUSION Turning induced N2O emission in dairy cattle manure. Higher maturity of manure heap could lead to lower N2O emission after turning.