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Bio-drying of municipal solid waste with high water content by aeration procedures regulation and inoculation

Author:
Zhang, Dong-Qing, He, Pin-Jing, Jin, Tai-Feng, Shao, Li-Ming
Source:
Bioresource technology 2008 v.99 no.18 pp. 8796-8802
ISSN:
0960-8524
Subject:
municipal solid waste, water content, drying, aeration, hydrolysis, aerobic conditions, biodegradation, lignocellulose, microbial colonization, microorganisms
Abstract:
To improve the water content reduction of municipal solid waste with high water content, the operations of supplementing a hydrolytic stage prior to aerobic degradation and inoculating the bio-drying products were conducted. A 'bio-drying index' was used to evaluate the bio-drying performance. For the aerobic processes, the inoculation accelerated organics degradation, enhanced the lignocelluloses degradation rate by 10.4%, and lowered water content by 7.0%. For the combined hydrolytic-aerobic processes, the inoculum addition had almost no positive effect on the bio-drying efficiency, but it enhanced the lignocelluloses degradation rate by 9.6% and strengthened the acidogenesis in the hydrolytic stage. Compared with the aerobic processes, the combined processes had a higher bio-drying index (4.20 for non-inoculated and 3.67 for the inoculated trials). Moreover, the lowest final water content occurred in the combined process without inoculation (50.5% decreased from an initial 72.0%).
Agid:
736917