The role of phase separation and feed cycle length in leach beds coupled to methanogenic reactors for digestion of a solid substrate (Part 2): Hydrolysis, acidification and methanogenesis in a two-phase system

作者：Cysneiros Denise^*; Banks Charles J; Heaven Sonia; Karatzas Kimon Andreas G

来源：Bioresource Technology, 2011, 102(16): 7393-7400.

DOI：10.1016/j.biortech.2011.05.042

• Acidification
• Anaerobic digestion
• Hydrolysis
• Leach bed reactor
• Methanogenesis

The effect of phase separation and batch duration on the trophic stages of anaerobic digestion was assessed for the first time in leach beds coupled to methanogenic reactors digesting maize (Zea mays). The system was operated for consecutive batches of 7, 14 and 28 days for similar to 120 days. Hydrolysis rate was higher the shorter the batch, reaching 8.5 gTS(destroyed) d(-1) in the 7-day system. Phase separation did not affect acidification but methanogenesis was enhanced in the short feed cycle leach beds. Phase separation was inefficient on the 7-day system, where similar to 89% of methane was produced in the leach bed. Methane production rate increased with shortening the feed cycle, reaching 3.523 ld(-1) average in the 7-day system. Low strength leachate from the leach beds decreased methanogenic activity of methanogenic reactors' sludges. Enumeration of cellulolytic and methanogenic microorganisms indicated a constant inoculation of leach beds and methanogenic reactors through leachate recirculation.

• 出版日期2011-8