Novel vertical flexible covering film anaerobic fermentation device

Abstract

The invention provides a novel vertical flexible covering film anaerobic fermentation device, comprising an anaerobic fermentation reactor and a flexible covering film fixed to the anaerobic fermentation reactor, wherein the anaerobic fermentation reactor is provided with, from bottom to top, a methane stirring device, a multipoint self-rotating water distributing device and a four-phase separator. The device is a novel vertical flexible covering film anaerobic fermentation device having the characteristics of: being low constant pressure and anaerobic, high-efficiency production of methane, long sludge age, low energy consumption and convenient operation and maintenance.

Description

【Technical field】 [0001] The invention relates to an anaerobic fermentation device, in particular to a novel vertical flexible film-covered anaerobic fermentation device. 【Background technique】 [0002] Continuous stirred tank reactor (continuous stirred tank reactor) referred to as CSTR, is a closed tank reactor with stirring device, which is the most widely used anaerobic fermentation device in the past. Through continuous stirring, the substrate and microorganisms in the reactor are always in a completely mixed state, and the new raw material can be quickly mixed with the entire fermentation liquid in the reactor, and the substrate concentration is kept relatively low, especially suitable for Anaerobic fermentation of feed liquors with high suspended solids content. The material distribution in the CSTR anaerobic fermentation device is uniform, the heat transfer is balanced, the contact between the substrate and the microorganism is good, the reaction is fast, efficient,...

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Problems solved by technology

The material distribution in the CSTR anaerobic fermentation device is uniform, the heat transfer is balanced, the contact between the substrate and the microorganism is good, the reaction is fast, efficient, the impact load resistance is strong, and there is no scum crusting, clogging, poor gas escape and channeling, etc. phenomenon, but because HRT, SRT and MRT are completely equal, the substrate concentration of the discharged feed liquid is equal to that of the fermentation liquid, and the microorganisms are also discharged when the feed is discharged, resulting in a high discharge concentration and serious loss of microorganisms; and in order to make the growth The proliferation of slow methanogenic bacteria and the speed of flushing out are kept in balance. The HRT requires a long time, generally 10-15 days or longer. The frequency is high, the operation and maintenance costs are high, and it is difficult to achieve complete mixing in large-scale production scales, and the treatment effect is not good; this kind of fermentation device is still a closed whole, it is inconvenient to disassemble and assemble, it is difficult to feed in and out, and it is difficult for the device to be airtight and resistant. The requirements for compressive strength are high, the production is difficult, and the service life is short; there is no slag discharge device in the device, and the scum flows out or accumulates with the effluent, which affects the quality of the effluent and is not conducive to the generation of biogas

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