Effect of leachate inoculum on biopretreatment of municipal solid waste by acombined hydrolytic-aerobic process
ZHANG Dongqing , HE Pinjing , SHAO Liming
DOI:
Received August 21, 2008,Revised October 20, 2008, Accepted , Available online
Volume 21,2009,Pages 1162-1168
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The biopretreatment of municipal solid waste by a combined hydrolytic-aerobic process has become of great interest for
biostabilization or biodrying. The study aimed at investigating the e ect of leachate inoculum on the biopretreatment. During the
hydrolytic stage, the inoculum addition at the ratio of leachate to waste (LWR) of 5% and 7% stimulated the start-up of hydrolysis
and enhanced the hydrolysis rate by 27.4% and 24.2%, respectively; whereas the inoculation at LWR of 1% had almost no e ect on
the hydrolysis rate and the inoculation at LWR of 10% reduced the hydrolysis rate by 12.7%. During the subsequent aerobic stage,
the inoculations at LWRs greater than 5% decreased organics degradation rate. As a whole, compared with none inoculation, the total
degradation rates of organics for inoculating trials at LWRs of 5%, 7% and 10% decreased by 14.5%, 14.3% and 32.7%, respectively.
Correspondingly, their net water removal rates were reduced by 4.4%, 5.8% and 19.0%. The inoculation at LWR of 1% could not
significantly a ect the biopretreatment. The inoculum addition at LWR of 5% and 7% could shorten hydrolytic stage and thus accelerate
the whole combined process. Moreover, the inoculations at LWRs greater than 5% were favorable for lignocelluloses degradation.
