Research And Development And Operational Characteristics Of Anaerobic Fermentation Device For Cold Regions

On the basis of the two-phase fermentation process, solar energy technology, ultrasonic cracking technology, and tourmaline-enhanced microbiology technology have been introduced to develop a new type of anaerobic fermentation device suitable for use in cold regions. The operational characteristics and gas production of the device were studied experimentally. Test results showed that the solar temperature control was 35 degrees C +/- 0.5 degrees C. Fresh cow dung was used as the substrate for fermentation. In the acid-producing phase, if the initial TS percentage concentration was high, the pH dropped quickly and the acid production rate increased. however, local volatile fatty acid accumulation occurred. For the partial or staged accumulation of volatile fatty acids, acid-phase 40-day organic acid terminal fermentation products starting with 8% TS were suitable as the methanogenic substrates. Increasing the organic load in the IC methanogenic phases increased the biogas production. However, it also easily led to an excessive accumulation of volatile acids, making the system unstable. While increasing the organic load of the system is a strategy to increase biogas production, an appropriate increase in HRT is needed to maintain stable and efficient system operation. When the HRT was 40 days and the OLR was 2.5 kgVS(add)gdm(-3)d(-1) in the methanogenic phase, the maximum volumetric capacity of biogas reached a high value of 1,280 Lm(reactor)(-3)d(-1), with the entire fermentation system remaining both stable and efficient.(1)