Estimation of landfill gas and its renewable energy potential in Lagos, Nigeria

Abstract

Estimation of the landfill gas (LFG) and electricity potential is one of the significant aspects of an integrated landfill development. In view of this, geological surveys were undertaken in all the government operated landfills in Lagos to appraise ground conditions for the exploitation of the anaerobically generated LFG. Thereafter, attempts were made to estimate the electricity potentials based on various equations and models. The geology of the landfill areas is essentially that of the Oligocene to Pleistocene Coastal Plain Sands except for that of Epe landfill area which is of Recent Deposits. The lithologies of the landfills in the Coastal Plain Sands areas seem suitable for landfill gas capture upon capping. Using stoichiometry, an achievable electrical power of 123.75 MW was deduced. By juxtaposition with an established Malaysian scenario, the yearly electrical energy was placed at 646,663.2 MWh with a tariff revenue in excess of US$64.68 million/year. Furthermore, an accruing carbon credit of about US$31.73 million/year is expected from certified emission reduction (CER) under the Kyoto Protocol. However, estimations by comparison with gas capturing sites across the globe yielded a mean of 38.35 MW. This is about 30 % of the theoretical and is capable of providing electricity to over 230,000 inhabitants. Hinged on actuality, this latter evaluation may aid to eradicate spurious estimations for practical purposes, and is critical in terms of global LFG capture economics. The concomitant benefits of LFG exploitation are expected to be exponentially higher in terms of reduction of greenhouse gases and mitigation of environmental hazards.

Sustainable Amelioration of Heavy Metals in Soil Ecosystem: Existing Developments to Emerging Trends

“…Industrial waste is composed of various harmful substances, especially HMs as well as other organic pollutants that affect the quality of the soil. Currently, more than 40% of bio-waste is landfilled, producing both carbon dioxide and methane [122]. Unlimited greenhouse gas creation from bio-waste landfills that endanger the environment and environmental issues require scientific intervention.…”

Intergovernmental panel on climate change’s landfill methane protocol: Reviewing 20 years of application

“…In ideal conditions, food waste may degrade quite quickly (Machado et al, 2009; Wang et al, 2015). However, landfills are not ideal anaerobic environments and it is unknown how long even readily degradable components require to degrade fully anaerobically (Idehai and Akujieze, 2015; Wangyao et al, 2010). Figure 6 shows the absolute maximum and minimum values of k defined by the IPCC, represented as the high and low boundaries of the boxes.…”

Electricity generation from landfill gas in Turkey

“…The gas generation factors of the site (Table 4) show that the recovered fraction is smaller than the generated amount. Table 4 gives a comparison of the LFG generation factors calculated for the site investigated with the published results of several researchers (Idehai and Akujieze, 2015;Taherzadeh, 2009;Johari et al 2012;Tsai 2007;Scarlat et al, 2015;Themelis and Ulloa 2007;Berenyi, 1999). Table 4 is a compilation of both field results and model estimates of published literature.…”