Biogas recovery methods are still the most usual way of extracting biogas from the landfill waste mass. However, a huge potential of biogas recovery remains inside the landfill mass. Due to the usual lack of monitoring, how efficient should we expect biogas recovery methods to be on MSW landfills?
Javier, you must take into consideration many conditions of the landfill, one of the most relevant is if the landfill (or landfill cell) is properly capped. Other conditions such as the bottom lining, the level of lechate (or perched levels), type of disposed waste and mixing with inert wastes, disposal methods, etc. may compromise gas extraction.
The gas collection network (gas wells or trenches) density and extraction system have also a relevant role.
From a conservative point of view, 60-75% of LFG could be reasonable values as far as the landfill is capped and there is no issue about the leachate level. Some bibliographic references mention up to 90% from capped landfills ("Methane mass balance at three landfill sites: What is the efficiency
of capture by gas collection systems?", K. Spokas et al.).
From a practical experience, 75% could be a good reference figure (compared with some generation models), but a detail assessment shall be made.
Javier Rodrigo-Ilarri Recovery of methane or biogas from MSW landfills is an interesting topic and I have been associated with a project in India where soon the recovery and upgradation shall be started...stay tuned for the results which i am gonna share within the next 4 months
Javier Rodrigo-Ilarri
Biogas recovery from Landfill link
Chapter Biogas recovery from landfills
Biogas recovery from land fill sites is very important and interesting. We can use specific strains of microbes to make it more efficient. Use of leak-proof sides of the site may help us to stop loss of biogas and pollution.
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