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 fields of sewage treatment and new energy, in particular to a multistage anaerobic reaction device and a method for preparing methane. Background technique [0002] Anaerobic treatment of sewage can produce methane as a by-product, and anaerobic reaction devices need to be used in sewage treatment. [0003] The anaerobic reaction device of prior art has following structural form: [0004] Chinese patent, ZL200910025896.8, invention name: anaerobic reactor, using a single reaction tank. [0005] Chinese patent, ZL200610118705.9, title of invention: a column-type anaerobic reactor, which adopts three-stage series connection, wherein the solid-liquid two-phase series connection and gas-phase parallel connection between the first stage and the second stage; the second stage and the second stage The solid-liquid-gas three-phase series is connected between the three stages. Electrodes are added in the second stage; in the reac...

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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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