Regenerative Energie
Due to anaerobic processes of organic matter, on landfill sites will be formed landfill gas containing methane, as well as leachate with a high concentration of organics metals, over decades or even centuries. Leachate and gas muss be collected and treated, to avoid severe damage to the public health and the environment. In consequence over ground land-filling of untreated municipal waste has been stopped in some countries (Germany 2006).
However, landfill sites which have been in operation until long time will require constant aftercare for the next decades. This aftercare time causes high economical costs to the owners of these landfills. To reduce the landfill aftercare period, several techniques have been developed in the last years, most of which using some form of aeration to accelerate the microbial processes within the landfill body. The discussion about landfill aftercare time mainly has been focused on when and under which conditions the aftercare phase of a landfill ends. The methods for stabilization of the waste are important. Therefore, some studies recently have been focused on aerobic processes, in order to reduce the aftercare period and stabilize the waste mass in the landfill body. Such reduction is given because of the aerobic biodegradation rates are faster than anaerobic degradation. The concept of the aerobic landfill basically involves the composting of readily and moderately degradable solid waste constituents. Each landfill must have the emissions of both, leachate and landfill gas, under an environmentally acceptable level, and using the technologies which aim to accelerate microbiological processes. Aerobic metabolism is not only quicker than that of anaerobic microorganisms, it also produces no harmful gases and nor bad odors. In order to supply oxygen to the landfills, most techniques attempt to distribute air inside the waste body. However, several possible disadvantages have been identified: expensive technical equipment, odor emissions by purging still existing landfill gas, uneven distribution of air due to the channeling or stop of microbial processes by drying out of waste. One of the principal objectives of this project tries to find out if these disadvantages can be avoided by the use of a solution of Hydrogen Peroxide (H2O2) as an alternative of oxygen source. H2O2 is quickly decomposed by aerobic microorganisms to oxygen and water, thus providing dissolved oxygen for the respiration of these microorganisms.
| Copyright: | © DGAW - Deutsche Gesellschaft für Abfallwirtschaft e.V. |
| Quelle: | 2. Wissenschaftskongress März 2012 - Rostock (März 2012) |
| Seiten: | 5 |
| Preis: | € 2,50 |
| Autor: | M.Sc. -Ing. Carlos A. Pacheco Bustos o. Prof. Dr.-Ing. Martin Kranert |
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