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Last reviewed on November 2, 2011 at 10:06

Documentation of California's Greenhouse Gas Inventory (First Edition - Last updated on 11/19/2007)

♦ Category: Waste

IPCC: 4D1 - Wastewater Treatment and Discharge - Domestic Wastewater Treatment and Discharge
Sector: Industrial : Waste Water Treatment : Domestic Waste Water

♦ Activity: California population -

♦ Greenhouse gas: Methane ( CH4 )

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► Year 1990 —

● Greenhouse gas emission estimate —

Amount: 95,599 tonnes of CH4 Emitted (2,007,575 tonnes CO2 Eq.)
Basis: Calculation
Calculation: [California Population] * [Per Capita biological organic demand (BOD5)] * [Average number of days per year] * [Proportion of BOD5 anaerobically digested] * [BOD5 CH4 emission factor]
Reference: USEPA (2007). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2005. United States Environmental Protection Agency. EPA 430-R-07-002. Chapter 8: Waste. April 15, 2007. Washington DC. http://www.epa.gov/climatechange/emissions/usgginv_archive.html

● Activity level used in calculations —

Activity: California population = 29,828,000 person
Basis: Data
Reference: CDOF (2007). California Department of Finance, California Demographic Research Unit: Population Estimates and Projections. Accessed online at: http://www.dof.ca.gov/HTML/DEMOGRAP/ReportsPapers/ReportsPapers.php

● Parameters and Constants used in calculations —

Parameter: BOD5 CH4 emission factor = 0.6 g / g
Reference: USEPA (2007). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2005. United States Environmental Protection Agency. EPA 430-R-07-002. Chapter 8: Waste. April 15, 2007. Washington DC. http://www.epa.gov/climatechange/emissions/usgginv_archive.html
Parameter: Per Capita biological organic demand (BOD5) = 90 g / person / day
Reference: USEPA (2007). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2005. United States Environmental Protection Agency. EPA 430-R-07-002. Chapter 8: Waste. April 15, 2007. Washington DC. http://www.epa.gov/climatechange/emissions/usgginv_archive.html
Parameter: Proportion of BOD5 anaerobically digested = 0.163
Reference: USEPA (2007). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2005. United States Environmental Protection Agency. EPA 430-R-07-002. Chapter 8: Waste. April 15, 2007. Washington DC. http://www.epa.gov/climatechange/emissions/usgginv_archive.html
Constant: Average number of days per year = 365.2425 day
Reference: USNO (2004). U.S. Naval Observatory, Astronomical Applications Department, Leap Years. Accessed online at: http://aa.usno.navy.mil/faq/docs/leap_years.php
Constant: Global warming potential of CH4 = 21
Reference: IPCC (1996). Second Assessment Report. Climate Change 1995: WG I - The Science of Climate Change. Intergovernmental Panel on Climate Change; J.T. Houghton, L.G. Meira Filho, B.A. Callander, N. Harris, A. Kattenberg, and K. Maskell (eds.); Cambridge University Press. Cambridge, U.K.

● Greenhouse gas emitted per unit activity —

Amount: 3,205 g (i.e. 3.21 kg) of CH4 per person
67,305 g (i.e. 67.31 kg) of CO2eq. per person