关键词: 微生物;沥出物;回收;降解;城市垃圾

Abstract: Biodegradation of waste in landfill is a slow process requiring decades for completion.
Accelerated degradation of municipal refuse in modulated landfill environments may
alleviate or eliminate pollution to the land, water and air. In this work, nineteen
effective microorganisms (EMs) were isolated fromold landfill refuse by enrichment
culturing techniques and used for the inoculum of municipal refuse. The preliminary
experiments demonstrate that a combination of EMs inoculation in landfill with leachate
recycle resulted in increased rates of decomposition and faster process stability. The
concentrations of COD, VFA and SO4^2- in digester with EMs inoculation and leachate recycle
decreased more rapidly than others. Gas production from digester with EMs inoculation and
leachate recycle commenced around 32 days, which is a week shorter than with leachate
recycle only. And peak cumulative gas production was obtained much earlier in digester with
EMs inoculation and leachate recycle (150 days) compared to 180 days with leachate recycle
only. Moreover, in the first two months, the rate of settlement in digester with EMs
inoculation and leachate recycle was more rapid than others.

Key words: municipal refuse, landfill, leachate recycle, effective microorganisms inoculation