Effects of environmental factors on methane generation: Test Cell Study

This paper presents that how environmental factors such as temperature, pH, and ammonia nitrogen affected on methane production within a test cell. Test cell covered an area of 54 m2 and had a final waste height of average 3 meters by filling approximately 147 tons of municipal solid waste (MSW). Results showed that pH level did not affected on methane production from MSW deposited after changed waste policy, which limits food waste landfilling; however, ammonia nitrogen level and waste temperature affected on methane prodution. Especially, the inhibition of methane production within landfills was severe when waste temperature is below 15ĀŽ and during initial anaerobic decomposition process.

Anaerobic decomposition of municipal solid waste (MSW) deposited within landfills generates significant amounts of landfill gas comprising 60% methane and 40% carbon dioxide (v/v), together with numerous trace gases (Christensen et al., 1996). Landfills have been implicated as the largest anthropogenic source of atmospheric methane in the world (Bogner et al., 1995). As estimated 37% of Korea global methane emissions is attributed to landfills (KEEI, 2003). Landfills function as a closed system, thus, it was considered as an anaerobic reactor. Many environmental factors affected on methane production from MSW within a landfill. In the last a few years, the waste management policy in Korea has led to major changes in the composition of MSW deposited within landfills. Main waste policy was included the reduction of food waste generated through a nation-wide campaign, the obligatory buiding of facilities for food waste resourcification, the banning the direct landfill of food waste, the control of packaging material waste generation, the recycling of business designation system, etc. Shift in waste composition results in the change of methane potential of MSW and environmental factors, which affect on methane production. Each waste component has different methane potential as well as different biodegradability. The water content within a landfill has been dropped due to decreasing the amount of organic wastes with high water content. The nature of the organic material deposited within a landfill has been changed from relatively rapidly degradable to less well degradable nature. Temperature within a landfill has been changed due to the lack of rapidly degradable materials.



Copyright: © IWWG International Waste Working Group
Quelle: General Session B (Oktober 2007)
Seiten: 7
Preis: € 7,00
Autor: Han Seock Cho
Ph.D. Kyoung-Hoon Shim
Ph.D. Joung Yeon Kim

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