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REGULATION FOR THE MANDATORY REPORTING OF GREENHOUSE GAS EMISSIONS - page 132 / 137

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(h) Methane and Nitrous Oxide Emission Factors for Wastewater Treatment

The method to derive an emission factor for fugitive methane and nitrous oxide emissions from wastewater treatment specified below is based on 2006 IPCC guidelines. This method is provided for use with section 95113(c)(1)(A)-(B) of the regulation.

Table 12. Default MCF Values for Industrial Wastewater

Type of Treatment and Discharge Pathway or System

Sea, river and lake discharge

Comments

Untreated

Rivers with high organic loading may turn anaerobic, however this is not considered here

MCF

Range

0.1

0 - 0.2

Well maintained, some CH4 may be emitted from settling basins

0

0 – 0.1

Not well maintained, overloaded

0.3

0.2 – 0.4

CH4 recovery not considered here

0.8

0.8 – 1.0

CH4 recovery not considered here

0.8

0.8 – 1.0

Depth less than 2 meters Depth more than 2 meters

0.2 0.8

0 – 0.3 0.8 – 1.0

Aerobic treatment plant

Aerobic treatment plant

Anaerobic digester for sludge

Anaerobic reactor

Anaerobic shallow lagoon Anaerobic deep lagoon

Treated

Source: Intergovernmental Panel on Climate Change, 2006 IPCC Guidelines for National Greenhouse Gas Inventories (2006), Volume 5, Waste, Chapter 6: Wastewater Treatment and Discharge. Prepared by the National Greenhouse Gas Inventories Programme, Eggleston H.S., Buendia L., Miwa K., Ngara T. and Tanabe K. (eds).

MCF = methane correction factor – the fraction of waste treated anaerobically

B =CH4 generation capacity (kg CH4/kg COD) Default factor = 0.25 kg CH4/kg COD

COD = chemical oxygen demand (kg COD/m3)

Emission factor for N2O from discharged wastewater EFN2O = 0.005 kg N2O-N/kg-N

Appendix A-16

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