Multistage anaerobic reaction device and method for preparing methane by utilizing same

Abstract

The invention discloses a multistage anaerobic reaction device which comprises a first stage reaction tank, a second stage reaction tank and a third stage reaction tank which are arranged in sequence and connected end to end, wherein the first stage reaction tank is provided with a stirring rank, the second stage reaction tank is provided with a stirring tank and / or a filler tank and the third stage reaction tank is provided with a filler tank; or the second stage reaction tank is provided with more than two stirring tanks and / or filler tanks connected end to end in series; a clapboard is arranged above each stirring tank and a stirring pump is arranged below the clapboard; and a clapboard is arranged in each filler tank and filler is arranged on the clapboard. By adopting the device disclosed by the invention, the gas producing efficiency of methane can be effectively improved.

Description

Technical field [0001] The invention relates to the field of sewage treatment and new energy, in particular to a multi-stage anaerobic reaction device and a method for preparing methane. Background technique [0002] Anaerobic wastewater treatment can produce by-product methane, and anaerobic reactors are needed in wastewater treatment. [0003] The prior art anaerobic reaction device has the following structural forms: [0004] Chinese patent, ZL200910025896.8, title of invention: Anaerobic reactor, using a single reactor. [0005] Chinese Patent, ZL200610118705.9, Title of Invention: A column-type anaerobic reactor adopts three stages in series, among which the first stage and the second stage are solid-liquid two-phase series and gas-phase parallel; the second stage and the first stage Between the three stages is a solid-liquid-gas three-phase series connection. Electrodes are added in the second stage; in the reactor, microorganisms grow in suspension; there is no mixing device ...

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Problems solved by technology

[0007] In the process of realizing the present invention, the inventors found that the prior art has at least the following problems: the first reactor: a small improvement of the traditional method, without considering the external suitable conditions for the growth of microorganisms in each stage of anaerobic degradation; the efficiency of anaerobic degradation is not enough High, methane content in the produced gas is not high

The second type of reactor: the external suitable conditions for the growth of microorganisms in each stage of anaerobic degradation are considered, but the symbiotic relationship of microorganisms in each stage is not fully considered, so that the efficiency of anaerobic degradation is not high enough, and the methane content in the output gas is still not high enough

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