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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK 12 As adapted from the Handbook of Biogas Utilization , the annual air emissions from the system are provided in Table 3.5. One item worth mentioning is on air the emission calculations for particulates, nitrogen oxides, and carbon monoxide. These pollutants are computed using the AP- 42 emission factors published by the EPA for natural gas. These factors predict emissions per million cubic feet of natural gas combusted, and the results listed in Table 3.5 use the methane content of the biogas. The calculation of sulfur dioxide emissions is a two-step process: first, the emissions of hydrogen sulfide from the biogas must be calculated and converted into sulfur dioxide, and second, the sulfur dioxide emissions from an equivalent volume of natural gas are calculated per AP-42. These are summed to provide the total amount of sulfur dioxide emitted. TABLE 3.5: Plug-Flow Digester Air Emissions Estimator P ARAMETER Biogas Produced System Operation Annual Biogas Production Biogas Specific Volume Biogas Density Annual Biogas Production Methane Content Annual Methane Production Carbon Dioxide Content Annual Carbon Dioxide Production Hydrogen Sulfide Content Annual Hydrogen Sulfide Production Sulfur Dioxide Emission from Hydrogen Sulfide Annual Sulfur Dioxide Production from Hydrogen Sulfide Sulfur Dioxide Emission Rate per AP-42 Sulfur Dioxide Emitted Rate per AP-42 Total Sulfur Dioxide Emitted Particulate Emission Rate per AP-42 Annual Particulate Emissions Nitrogen Oxides Emission Rate per AP-42 Total Nitrogen Oxides Emissions Carbon Monoxide Emission Rate per AP-42 Total Carbon Monoxide Emissions QUANTITY 35,700 SCF/day 365 days/year 13,030,500 SCF Year 13.429 SCF/lb 0.0745 lb/SCF 485 tons/year 62.3% 303 tons/year 37.6% 182 tons/year 1,500 ppm 0.94 tons/year 1.78 lb/lb H2S 1.67 tons/year 0.60 lb/million SCF 0.00 tons/year 1.67 tons/year 13.70 lb/per million SCF 0.09 tons/year 140.00 lb/million SCF 0.91 tons/year 35.00 lb/million SCF 0.23 tons/year The AP-42 emission factors also provide a number for calculating sulfur dioxide emissions from natural gas. The natural gas number is added to the amount of sulfur dioxide contributed by combusting biogas containing hydrogen sulfide. It was assumed that the biogas would contain 12 Regional Biomass Energy Program. p. 7-10. Ross, C., et al. (1996). Handbook of Biogas Utilization, Second Edition. Muscle Shoals, AL: Southeastern 3-12PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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