40 C.F.R. § 98.363
Where:
MMSC = Manure management systems component.
TVSAT = Total volatile solids excreted by animal type, calculated using Equation JJ-3 of this section (kg/day).
VSMMSC = Fraction of the total manure for each animal type that is managed in MMS component MMSC, assumed to be equivalent to the fraction of VS in each MMS component.
VSss = Volatile solids removal through solid separation; if solid separation occurs prior to the MMS component, use a default value from Table JJ-4 of this section; if no solid separation occurs, this value is set to 0.
(B0)AT = Maximum CH4-producing capacity for each animal type, as specified in Table JJ-2 of this section (m3 CH4/kg VS).
MCFMMSC = CH4 conversion factor for the MMS component, as specified in Table JJ-5 of this section (decimal).
Where:
TVSAT = Daily total volatile solids excreted per animal type (kg/day).
PopulationAT = Average annual animal population contributing manure to the manure management system by animal type (head) (see description in § 98.363(a)(i) and (ii) below).
TAMAT = Typical animal mass for each animal type, using either default values in Table JJ-2 of this section or farm-specific data (kg/head).
VSAT = Volatile solids excretion rate for each animal type, using default values in Table JJ-2 or JJ-3 of this section (kg VS/day/1000 kg animal mass).
Where:
PopulationAT = Average annual animal population (by animal type).
Days onsiteAT = Average number of days the animal is kept at the facility, by animal type.
NAPAAT = Number of animals produced annually, by animal type.
Where:
CH4 EmissionsAD = CH4 emissions from anaerobic digestion (metric tons/yr).
AD = Number of anaerobic digesters at the manure management facility.
CH4C = CH4 flow to digester combustion device, calculated using Equation JJ-6 of this section (metric tons CH4/yr).
CH4D = CH4 destruction at digesters, calculated using Equation JJ-11 of this section (metric tons CH4/yr)
CH4L = Leakage at digesters calculated using Equation JJ-12 of this section (metric tons CH4/yr).
Where:
CH4C = CH4 flow to digester combustion device (metric tons CH4/yr).
V = Average annual volumetric flow rate, calculated in Equation JJ-7 of this subsection (cubic feet CH4/yr).
C = Average annual CH4 concentration of digester gas, calculated in Equation JJ-8 of this section (%, wet basis).
0.0423 = Density of CH4 lb/scf (at 520 °R or 60 °F and 1 atm).
T = Average annual temperature at which flow is measured, calculated in Equation JJ-9 of this section (°R).
P = Average annual pressure at which flow is measured, calculated in Equation JJ-10 of this section (atm).
Where:
V = Average annual volumetric flow rate (cubic feet CH4/yr).
OD = Operating days, number of days per year that that the digester was operating (days/yr).
Vn = Daily average volumetric flow rate for day n, as determined from daily monitoring as specified in § 98.364 (acfm).
Where:
C = Average annual CH4 concentration of digester gas (%, wet basis).
OD = Operating days, number of days per year that the digester was operating (days/yr).
Cn = Average daily CH4 concentration of digester gas for day n, as determined from daily monitoring as specified in § 98.364 (%, wet basis).
Where:
T = Average annual temperature at which flow is measured (°R).
OD = Operating days, number of days per year that the digester was operating (days/yr).
Tn = Temperature at which flow is measured for day n(°R).
Where:
P = Average annual pressure at which flow is measured (atm).
OD = Operating days, number of days per year that the digester was operating (days/yr).
Pn = Pressure at which flow is measured for day n (atm).
Where:
CH4D = CH4 destruction at digester combustion device (metric tons/yr).
CH4C = Annual quantity of CH4 flow to digester combustion device, as calculated in Equation JJ-6 of this section (metric tons CH4).
DE = CH4 destruction efficiency from flaring or burning in engine (lesser of manufacturer's specified destruction efficiency and 0.99). If the gas is transported off-site for destruction, use DE = 1.
OH = Number of hours combustion device is functioning in reporting year.
Hours = Hours in reporting year.
Where:
CH4L = Leakage at digesters (metric tons/yr).
CH4C = Annual quantity of CH4 flow to digester combustion device, as calculated in Equation JJ-6 of this section (metric tons CH4).
CE = CH4 collection efficiency of anaerobic digester, as specified in Table JJ-6 of this section (decimal).
Where:
Nex AT = Daily total nitrogen excreted per animal type, calculated using Equation JJ-14 of this section (kg N/day).
Nex,MMSC = Fraction of the total manure for each animal type that is managed in MMS component MMSC, assumed to be equivalent to the fraction of Nex in each MMS component.
Nss = Nitrogen removal through solid separation; if solid separation occurs prior to the MMS component, use a default value from Table JJ-4 of this section; if no solid separation occurs, this value is set to 0.
EFMMSC = Emission factor for MMS component, as specified in Table JJ-7 of this section (kg N2O-N/kg N).
Where:
Nex AT = Total nitrogen excreted per animal type (kg/day).
PopulationAT = Average annual animal population contributing manure to the manure management system by animal type (head) (see description in § 98.363(a)(i) and (ii) ).
TAMAT = Typical animal mass by animal type, using either default values in Table JJ-2 of this section or farm-specific data (kg/head).
NAT = Nitrogen excretion rate by animal type, using default values in Tables JJ-2 or JJ-3 of this section (kg N/day/1000 kg animal mass).
Where:
CH4 emissionsMMS = From Equation JJ-2 of this section.
CH4 emissionsAD = From Equation JJ-5 of this section.
21 = Global Warming Potential of CH4.
Direct N2O emissions = From Equation JJ-13 of this section.
310 = Global Warming Potential of N2O.
40 C.F.R. §98.363