Research Progress in Anaerobic Digestion of High Moisture

Guangqing Liu, Ruihong Zhang, Zhenjun Sun, Xiujin Li, Renjie Dong

Abstract


High moisture organic waste constitutes a large fraction of municipal solid waste and caused
a nuisance. Anaerobic digestion of this high degradable fraction has been developed during
the past 20 years. Parameters such as characteristic of substrates, temperature, organic
loading rate and hydraulic retention time were studied. The most important conversion of
intermediate of volatile fatty acid was observed as a indicator of digestion efficiency. One
stage and two stage system are based on the stage separated into acidogenic phase and
methnogenis phase. Two stage digestion of this kind of wastes were proved a better
efficiency than single stage digestion. Batch system and continuous system are conducted in
single stage and two-stage system. One stage system are split between wet system(Total solid
less than 15%) and dry system( total solid higher than 15%) according to the characteristics
of feedstock. Two-stage solid bed system are observed more and more popular in the
digestion of solid state VFW and food waste experimental studies, however the large majority
of industrial application use single stage systems. Two stage digestion of HMOW will be
applied to industrial scale due to its larger resistance to high loading rate, high and stable gas
production.

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