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(equivalent to the end of methanogenesis). The diagram depicts the final, fifth stage of organic decomposition as the end of anaerobic decomposition and gradual fading of methane generation by landfilled waste. Figure 1 shows a typical organic decomposition model, distinguishing five key stages of chemical and biochemical processes leading to landfill gas generation. Stage 1: oxygen decomposition Stage 2: acidic fermentation Stage 3: unsteady methanogenesis Stage 4: steady methanogenesis. Stage 5: end of decomposition Figure 1. Organic decomposition phases. Source: [3] Decomposition stages Duration: 7 – 30 days Duration: 1 – 6 months Duration: 3 – 36 months Duration: 5 – 50 years Duration: 10 – 40 years. Landfill gas generation have been relatively well researched. However, the gas generation process is affected by so many factors that, given the significantly variable site conditions, any theoretical assessment of the gas generation rate is overly complicated. Empirical models were developed as a result at the need to accurately assess/estimate the volume of methane emissions. Some of the models may be conveniently applied to calculation of the energy potential of a LFG energy project. However, one should remember that any such estimates are prepared using mathematical models, and that modeling requires a wealth of data waste of landfill characteristics, such as waste composition, compaction, age, temperature, moisture content, type of cover, and landfill closure design etc. Calculations are made using various kinetic models of organic decomposition, while algorithms, due to difficulties with obtaining the necessary data, contain a large number of simplifying assumptions [1]. 7 Component concentration [%]PDF Image | Landfill Gas Energy Technologies
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