Abstract
It is expected that marginally aerobic layer around the leachate collection pipe has enough capacity to stabilize the leachate in semi-aerobic landfills. To model such marginally aerobic zone, artificial incombustible refuse, artificial mixed refuse and crushed stones were packed in columns respectively and TOC removal capacity of the leachate in each column was measured.
Consequently the following results were obtained.
1) Aerobic decomposition of acetic acid occurred almost as a single reactor condition in artificial refuse and crushed stones layer.
2) Saturation coefficient Km in Monod equation is estimated to be about 2% in mixed refuse layer, about 1% in the others.
3) When oxygen gas concentration was more than 1-2%, TOC removal efficiency was almost 100% with less than 100g/(m3·d) of TOC inlet load.
