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40 C.F.R. § 98.353

Calculating GHG emissions.

§ 98.353 Calculating GHG emissions.

(a) For each anaerobic reactor and anaerobic lagoon, estimate the annual mass of CH4 generated according to the applicable requirements in paragraphs (a)(1) through (a)(2) of this section.

(1) If you measure the concentration of organic material entering the anaerobic reactors or anaerobic lagoon using methods for the determination of chemical oxygen demand (COD), then estimate annual mass of CH4 generated using Equation II–1 of this section.

er12jy10.012.gif

Where:

CH4Gn = Annual mass CH4 generated from the nth anaerobic wastewater treatment process (metric tons). n = Index for processes at the facility, used in Equation II–7. w = Index for weekly measurement period. Floww = Volume of wastewater sent to an anaerobic wastewater treatment process in week w (m /week), measured as specified in § 98.354(d). CODw = Average weekly concentration of chemical oxygen demand of wastewater entering an anaerobic wastewater treatment process (for week w)(kg/m ), measured as specified in § 98.354(b) and (c). B0 = Maximum CH4 producing potential of wastewater (kg CH4/kg COD), use the value 0.25. MCF = CH4 conversion factor, based on relevant values in Table II–1 of this subpart. 0.001 = Conversion factor from kg to metric tons.

(2) If you measure the concentration of organic material entering an anaerobic reactor or anaerobic lagoon using methods for the determination of 5-day biochemical oxygen demand (BOD5), then estimate annual mass of CH4 generated using Equation II–2 of this section.

er29no11.001.gif

Where:

CH4Gn = Annual mass of CH4 generated from the anaerobic wastewater treatment process (metric tons). n = Index for processes at the facility, used in Equation II–7. w = Index for weekly measurement period. Floww = Volume of wastewater sent to an anaerobic wastewater treatment process in week w(m /week), measured as specified in § 98.354(d). BOD5,w = Average weekly concentration of 5-day biochemical oxygen demand of wastewater entering an anaerobic wastewater treatment process for week w(kg/m ), measured as specified in § 98.354(b) and (c). B0 = Maximum CH4 producing potential of wastewater (kg CH4/kg BOD5), use the value 0.6. MCF = CH4 conversion factor, based on relevant values in Table II–1 to this subpart. 0.001 = Conversion factor from kg to metric tons.
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