The stabilization properties of agedrefuse in fiveyearold semiaerobic and anaerobic landfills were compared

such as volatile solid (VS)

total organic carbon content (TOC)

humic matters

and so on. It was found that VS and TOC content in agedrefuse were obviously lower than those in fresh refuse after five years disposal. However

the VS and TOC content of agedrefuse in semiaerobic landfill were slightly lower than anaerobic ones

whilst the difference was not significant. Surface settlements of semiaerobic landfills were higher than that of anaerobic ones (P<0.05). Moreover

there was negative correlation between VS content and surface settlements. Both leachate and water recycling methods did not lead to significant VS content difference

while leachate recycling would cause obviously uneven surface settlement. Biological degradable materials (BDM) value of agedrefuse in semiaerobic landfill and anaerobic one was similar. Furthermore

BDM value increased with the increase of air pipe distance and depth. The greater the air pipe distance is

the bigger the difference of BDM value between the layers is. In addition

total extraction ratios of humic matters and HA/FA in semiaerobic and anaerobic landfill agedrefuse had no significant differences.