title: Effect of C/N ratio, aeration rate and moisture content on ammonia and greenhouse gas emission during the composting.
abstract: Gaseous emission (N2O, CH4 and NH3) from composting can be an important source of anthropogenic greenhouse gas and air pollution. A laboratory scale orthogonal experiment was conducted to estimate the effects of C/N ratio, aeration rate and initial moisture content on gaseous emission during the composting of pig faeces from Chinese Ganqinfen system. The results showed that about 23.9% to 45.6% of total organic carbon (TOC) was lost in the form of CO2 and 0.8% to 7.5% of TOC emitted as CH4. Most of the nitrogen was lost in the form of NH3, which account for 9.6% to 32.4% of initial nitrogen. N2O was also an important way of nitrogen losses and 1.5% to 7.3% of initial total nitrogen was lost as it. Statistic analysis showed that the aeration rate is the most important factor which could affect the NH3 (p = 0.0189), CH4 (p = 0.0113) and N2O (p = 0.0493) emissions significantly. Higher aeration rates reduce the CH4 emission but increase the NH3 and N2O losses. C/N ratio could affect the NH3 (p = 0.0442) and CH4 (p = 0.0246) emissions significantly, but not the N2O. Lower C/N ratio caused higher NH3 and CH4 emissions. The initial moisture content can not influence the gaseous emission significantly. Most treatments were matured after 37 days, except a trial with high moisture content and a low C/N ratio.
authors.affiliation: College of Resources and Environment Sciences, China Agricultural University, Beijing 100094, China. runzejiang@yahoo.cn
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.forename: Frank
authors.initials: F
authors.lastname: Schuchardt
authors.forename: Guoxue
authors.initials: G
authors.lastname: Li
authors.forename: Rui
authors.initials: R
authors.lastname: Guo
authors.forename: Yuanqiu
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000641:Ammonia / Q000032:analysis / Q000378:metabolism*; D000818:Animals; D002244:Carbon / Q000378:metabolism; D002245:Carbon Dioxide / Q000032:analysis / Q000378:metabolism*; D017752:Greenhouse Effect; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000032:analysis / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D009609:Nitrous Oxide / Q000032:analysis / Q000378:metabolism*; D012987:Soil / Q000737:chemistry*; D013552:Swine
chemical_list: D008372:Manure; D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon; D000641:Ammonia; D009609:Nitrous Oxide; D009584:Nitrogen; D008697:Methane