The advantage of processing the organic fraction of solid waste in biogas reactors rather than in landfills is that biogas does not end even after 30-40 years. As long as fresh waste comes in, there is biogas production. In landfills, gas production ends in 3-7 years. However, due to its low cost the method of producing biogas in landfills is also popular.
There are of two landfill types in terms of waste collection and gas production: organized and unorganized.
In solid waste landfills, the same biogas is generated as in biogas plants. The same processes of anaerobic fermentation occur faster in biogas reactors and slower in landfills.
In the organized landfill, horizontal perforated pipes for biogas collection are laid in the body of the landfill at the time of installation. Vertical pipes are laid at the time of laying the landfill or wells are drilled after landfill is filled. The landfill itself is waterproofed from all sides including from above. In this case, there is no biogas leakage from the landfill resulting in maximum gas output. Landfills are created sufficiently deep 80-100 m.
Garbage is collected and documented the logbook which indicates which garbage was put in which part of the landfill and at what time. Biogas from such a landfill can be extracted for as long as 8-12 years.
In an unorganized landfill, waste is dumped without laying horizontal pipes and often even without waterproofing. Vertical wells are drilled and vertical pipes are laid. The well top is concreted. Wells are drilled at the distance of 15-25 m from one another.
The well action range should overlap the zones between the wells. The depth of landfills varies from 20 to 40 m. Biogas is extractable for just 3-7 years.
The biogas is pumped out of the vertical pipes and collected in gasholders. Then biogas is dried, cleaned of impurities, compressed, and fed to a generator or torch.
Biogas from landfills has a low methane content (30-45%) and a high content of impurities, hydrogen sulfide - up to 3000-5000 ppm. Therefore, the installation of good filters is required.
Gas collection organization and gas production in landfills
Biogas plants are technically more complicated than landfills. Zorg Biogas has significant experience in the gas preparation of biogas and power generation installations within biogas plant projects.
Components for solid waste landfills torches and gas blowers were supplied as well. If necessary, Zorg Biogas will carry out drilling projects.
To calculate a quotation for a biogas extraction project from a landfill, please fill out the questionnaire for landfills.
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