Abstract
Globally, various practical data and scholarly estimations of the electricity potentials of landfill gas (LFG) have been forwarded and these can be juxtaposed for estimations in the megacity called Lagos. The calculated values were between 63.22- 700MW of derivable electricity. However, in order to limit observable disparities and ambiguities in these derivations and thus allow for more accurate projections, these estimations can be gauged using as template; -stoichiometry, establishing 50% of landfill gas as methane, assuming 50% of this volume as recoverable, and using a proposed engine efficiency of 30%. This standardization projects a theoretical mean achievable electrical power of 121.69 MW for the Lagos area from a population of about 21 million with a generation per capita (GPC) of 0.63kg with biodegradable content of about 60%. The yearly electrical energy was placed at 1,066,004.4 MWh with tariff revenue in excess of US$ 106.6 million /yr. An accruing carbon credit of about US$75.59 million /yr is expected from certified emission reduction (CER). The projected derivations can be used as models for evaluation of the landfill gas and electricity potentials in many parts of the world.
Highlights
Anaerobic degradation of biomass in the Lagos landfills in the presence of excess water, bacteria and a pH of about 7 produces methane which can be harnessed for electricity
In order to limit observable disparities and ambiguities in these derivations and allow for a more accurate projection, these estimations can be standardized using as template: stoichiometry, establishing 50% of landfill gas as methane, assuming 50% of this volume as recoverable, and by using engine efficiencies of 30%
Methane is lighter than air and can accumulate beneath structures and buildings, resulting in vegetational stress and toxicity due to H2S and volatile organic compounds (VOCs), corrosion due to CO2–created acidity, greenhouse gases and air emissions
Summary
Anaerobic degradation of biomass in the Lagos landfills in the presence of excess water, bacteria and a pH of about 7 produces methane which can be harnessed for electricity. Methane is lighter than air and can accumulate beneath structures and buildings, resulting in vegetational stress and toxicity due to H2S and volatile organic compounds (VOCs), corrosion due to CO2–created acidity, greenhouse gases and air emissions. It is explosive above 5 to 15% by volume and causes subsurface migration offsite (up to 150 m). The thrust of this study is to standardize some previous attempts at the estimation of the green energy potential & environmental benefits of the landfill gas (LFG) from around the globe for estimations in the Lagos area. It attempts to establish a benchmark and threshold for these estimations in the Lagos context using stoichiometry and gas laws
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