Anaerobic digestion device for enhancing biogas production by utilizing self-sustaining air floatation

Abstract

The invention provides an anaerobic digestion device for enhancing biogas production by utilizing self-sustaining air floatation, which comprises an anaerobic digestion main tank unit, a self-sustaining air floatation screening unit and a biogas metering and collecting unit, wherein the self-sustaining air floatation screening unit comprises an air floatation screening part, a material precipitation part, an active reflux part and a three-phase separation part which are sequentially connected from bottom to top; digested materials in the anaerobic digestion main tank unit are pumped into the air floatation screening part, overflow into the material precipitation part, then are lifted to the active reflux part, and gas generated by the three-phase separation part and the anaerobic digestionmain tank unit enter the biogas metering and collecting unit. According to the anaerobic digestion device disclosed by the invention, based on the phenomenon that organic matters are degraded in an anaerobic process to produce methane, the self-sustaining air flotation screening unit is added, so that the self-sustaining air flotation-screening-backflow of high-activity microorganisms and the discharge of materials which are more difficult to degrade are realized, and the problem of insufficient degradation caused by short flow of materials in the anaerobic digestion process of organic solidwastes is effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of anaerobic digestion of organic solid waste, and in particular relates to an anaerobic digestion device for strengthening biogas production by self-sustaining air flotation. Background technique [0002] At this stage, my country's organic solid waste mainly includes: domestic sources (urban sludge, domestic waste, garden waste, etc.), agricultural sources (agricultural straw, mulch, livestock and poultry manure, etc.) waste, etc.), the annual output exceeds 6 billion tons, accounting for more than 60% of the total solid waste generation, but a scientific and reasonable management and safe disposal technology system has not yet been formed. Organic solid waste has typical pollution properties, with complex components and many harmful media. It occupies an area of ​​land and forms multi-phase compound cross-contamination with the surrounding environment. [0003] The utilization methods of organic solid was...

AI Technical Summary

Problems solved by technology

[0004] With the emergence of the second-generation anaerobic reactor represented by the upflow anaerobic sludge bed (UASB) and the third-generation anaerobic reactor represented by the expanded granular sludge bed (EGSB), the anaerobic treatment of sewage The organic load (OLR) was increased to 50kg COD(m 3 d) -1 Even 100kg COD(m 3 d) -1 As mentioned above, anaerobic technology has made great achievements in the field of sewage treatment, and anaerobic theory is relatively perfect, but the progress of anaerobic technology in the field of organic solid waste is still slow

Due to its complex structure, organic solid waste has many technical difficulties in the anaerobic fermentation process, and the development of reactors for organic solid waste is relatively lagging behind

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