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Equation 8.10 Organic content and emission factors in domestic wastewater55

TOWi = P × BOD × I × 365 EFj = Bo × MCFj × Ui × Ti. j

Description TOWi

For domestic wastewater: total organics in wastewater in inventory year, = kg BOD/yr

P BOD

City’s population in inventory year (person)

Value Computed User input56

= City-specific per capita BOD in inventory year, g/person/day

User input

I

= Correction factor for additional industrial BOD discharged into sewers

In the absence of expert judgment, a city may apply default value 1.25 for collected wastewater, and 1.00 for uncollected.57

EFi

= Emission factor for each treatment and handling system

Computed

Bo

= Maximum CH4 producing capacity

User input or default value: • 0.6 kg CH4/kg BOD • 0.25 kg CH4/kg COD

MCFj

= Methane correction factor (fraction)

User input58

Ui

= Fraction of population in income group i in inventory year

Ti. j

=

Degree of utilization (ratio) of treatment/discharge pathway or system, j, for each income group fraction i in inventory year

User input59

Source: 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Volume 5, chapter 6: Wastewater Treatment and Discharge

55. Due to the complexity, the GPC only provides guidance for assumption of TOW and EF for domestic wastewater treatment. For industrial wastewater treatment please consult section 6.2.3 of chapter 6, volume 5 of 2006 IPCC Guidelines for National Greenhouse Gas Inventories. 56. If city-specific data are not available, city can consult national specific data or reference the default national value provided by 2006 IPCC Guidelines for National Greenhouse Gas Inventories (table 6.4 of Volume 5, Chapter 6: Wastewater Treatment and Discharge) 57. Based on expert judgment by the authors, it expresses the BOD from industries and establishments (e.g., restaurants, butchers or grocery stores) that is co-discharged with domestic wastewater. In some countries, information from industrial discharge permits may be available to improve i. Otherwise, expert judgment is recommended. 58. Or consult with default value provided by 2006 IPCC Guidelines for National Greenhouse Gas Inventories (table 6.3 (domestic) and table 6.8 (industrial) of Volume 5, Chapter 6: Wastewater Treatment and Discharge) 59. Or consult with default value provided by 2006 IPCC Guidelines for National Greenhouse Gas Inventories (table 6.5 of Volume 5, Chapter 6: Wastewater Treatment and Discharge)

102 Global Protocol for Community-Scale Greenhouse Gas Emission Inventories


Global Protocol for Community-Scale Greenhouse Gas Emission Inventories