Evolution on qualities of leachate and landfill gas in thesemi-aerobic landfill
HUANG Qifei , YANG Yufei , PANG Xiangrui , WANG Qi
DOI:
Received June 26, 2007,Revised August 23, 2007, Accepted , Available online
Volume 20,2008,Pages 499-504
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To study the characteristics of stabilization in semi-aerobic landfill, large-scale simulated landfill was constructed based on the semiaerobic
landfill theory. Consequently, the concentrations of chemical oxygen demand (COD), ammonia nitrogen, and nitrite nitrogen,
and the pH value in leachate, as well as the component contents of landfill gas composition (methane, carbon dioxide, and oxygen) in
landfill were regularly monitored for 52 weeks. The results showed that COD and ammonia concentrations declined rapidly and did not
show the accumulating rule like anaerobic landfill, and remained at about 300 and 100 mg/L, respectively, after 48 weeks. Meanwhile,
the descending rate reached 98.9% and 96.9%, respectively. Nitrate concentration increased rapidly after 24 weeks and fluctuated
between 220–280 mg/L after 43 weeks. The pH values were below 7 during the first 8 weeks and after that leachates appeared to be
alkaline. Carbon dioxide was the main composition in landfill gas and its concentration remained at a high level through the whole
stabilization process. The average contents of carbon dioxide, oxygen, and methane varied between 19 vol.%–28 vol.%, 2 vol.%–8
vol.%, and 5 vol.%–13 vol.%, respectively. A relative equilibrium was reached after 48 weeks. The highest temperature in the landfill
chamber could amount to 75.8 degrees centigrade.
