A dry-wet two-step biogas fermentation device and method

Abstract

The invention relates to a wet -dry two-step biogas fermentation device and method. The biogas fermentation device comprises a primary dry fermentation mechanism and a secondary wet fermentation mechanism, wherein the primary dry fermentation mechanism comprises a dry fermentation tank filled with a material fluid, a net box which is filled with materials and is immersed in the material fluid, and a water seal cover sealed at top part of the net box; an upper discharge tube and a first air guide tube are respectively arranged on the side wall of the dry fermentation tank; the secondary wet fermentation mechanism comprises a wet fermentation tank which is integrally arranged at bottom part of the dry fermentation tank and is connected with the bottom part of the dry fermentation tank, a heat exchanger which is arranged inside the wet fermentation tank and is connected with the circulation hot water, and a biological membrane which is suspended and fixed in the wet fermentation tank; a second air guide tube, a drain tube and a lower discharge tube are respectively arranged on the side wall of the wet fermentation tank. By adopting the biogas fermentation device, appropriate facultative anaerobic and whole anaerobic good living environments can be provided for the flora with different breath types, the easy blockage of the sludge pump is solved, the degrading time of the fiber material is shortened, the utilization rate of the fermenting raw material is increased, the volume biogas production of the device is increased and the content of the methane in the biogas is increased.

Description

technical field [0001] The invention relates to a biogas fermentation device and method, in particular to a dry-wet two-step method capable of processing organic waste such as high-fiber carbon-rich straw, kitchen waste, and nitrogen-rich livestock and poultry manure to produce biogas and organic fertilizer. A biogas fermentation device and method belong to the technical field of biogas fermentation. Background technique [0002] With the rapid development of my country's new rural construction, the increasingly serious domestic waste pollution is worrying. Domestic waste and straw are piled up randomly, livestock manure can be seen everywhere, and domestic sewage flows underground. If these environmental pollution problems are not scientifically treated as soon as possible, they will be destroyed It will seriously affect the process of building a new socialist countryside. The commonly used method for treating organic waste is anaerobic fermentation, which can turn waste in...

AI Technical Summary

Problems solved by technology

At present, the conventional anaerobic fermentation device generally adopts a fully mixed fermenter (CSTR). Oxygen fermentation, on the one hand, due to the low density of straw, it is often easy to float on the top of the fermentation tank, which may easily cause crusting on the top of the material or short circuit of the material, and easily lead to blockage of the sludge pump; The biogas fermentation process needs to go through the acidification stage first, and the suitable bacteria group in the acidification stage is facultative anaerobic bacteria, and the full-mixed biogas fermentation device is used to try to anaerobically ferment all materials, which leads to a decrease in the utilization rate of straw materials , resulting in a decrease in the volumetric gas production rate, increasing the construction cost of the device, and poor cost performance, which is not conducive to use and promotion

Images