Methane phase digester

Cations on the Methane Phase in Continuous Digestion Systems, /. Water Pollut. Contr. Fed., in press. 

C, application of this equation indicated that optimum conversion of glucose can be achieved at 0 s of 4 h and 4 days in the acid- and methane-phase reactors. For cellulosics and activated biosolids, the corresponding ffs are much higher, about 1 to 2 days for acid-phase digestion and 5 to 8 days for methane-phase digestion. 

The relationship of the acid and methane phases to the scheme in Fig. 12.1 raises several interesting questions, such as where the acetogenic bacteria are located and whether methane is formed exclusively from acetate or from both carbon dioxide reduction and acetate in the methane-phase reactor. The experimental data useful in answering these questions include the observations that for a glucose-fed, two-phase digestion system, more than 96% of the products from the acid-phase reactor were carbon dioxide, hydrogen, acetate. 

TabI V. THERMOPHILIC (BEX) ACID-PHASE AND MESOPHILIC OB C) METHANE-PHASE DIGESTION OF PRETREATED HYACINTH-QRASS-MSW-SLUDOE BLEND... 

Fig. 4. Microbial phases in anaerobic digestion A, hydrolysis B, acidification C, methane fermentation.

Thereafter, only one side of the system was fed raw sludge. The organisms of Phase II of the process had to receive their substrate through the membrane. In this application, (Digester No. 2), the unfed side of the system, rapidly became an enrichment culture of methane organisms. 

The optimal values were established by an electrical poising device previously described (10). The system response however was strictly that of two single-stage digesters in series. No amount of acidification appeared to stop the formation of the bulk of the methane in Phase I as long as changes were made gradually. This aspect of the study seemed... 

The process of leachate formation in a landfill covers several phases, starting with initial decomposition to an acid forming period then to the methane formation phase. This biological process in which organic matter is catabolised to methane and carbon dioxide is anaerobic digestion. 

Digester gases were recycled at various recycle ratios from 2 to 125. The best methane yield of 3.95 SCF/lb VS added, which was about 15% higher than the baseline yield, was observed at a gas recycle ratio of 39 (Table III). The gas-phase dilution rate at this recycle ratio was about 0.2 hr. The existence of an optimum gas recycle ratio is rationalized as follows As the gas recycle... 

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