Up-flow anaerobic sludge bed reactor and operation method

Abstract

The invention relates to an up-flow anaerobic sludge bed reactor and an operation method, in particular to an up-flow anaerobic sludge bed reactor with functions of inner circulation, outer circulation, inner heating, outer heat exchange and cracking and an operation method thereof. The up-flow anaerobic sludge bed reactor comprises a tank body of the reactor, diversion heating devices, a methane circulation system and a dirty water circulation system, wherein the inner part of the tank body is divided into a sludge bed area, a floating area and a depression area; a plurality of diversion heating devices composed of diversion tubes and heating coils are arranged in the floating area; and the methane circulation system and the dirty water circulation system are respectively provided with external pipelines to form a circulation path with the tank body of the reactor, so that the operations of anaerobic treatment, diversion and circulation mixing, heating, backflushing, outer circulation, sludge disposal, cracking and the like can be carried out. The up-flow anaerobic sludge bed reactor has the advantages that the contact time of dirty water and sludge is long, the anaerobic digestion reaction temperature is uniform, the organic loading rate is high, the gas production rate is high, crusting is difficult, the cracking is easy after crusting, the energy is saved compared with an expended granular sludge bed reactor and the like. The up-flow anaerobic sludge bed is suitable for dealing with organic dirty water with high solid content.

Description

[technical field] [0001] The invention relates to an upflow anaerobic sludge bed reactor and an operation method, in particular to an upflow anaerobic sludge bed reaction with functions of internal circulation, external circulation, internal heating, external heat exchange and shell breaking device and its method of operation. [Background technique] [0002] Biogas engineering technology is a very effective technology to control organic waste pollution and convert organic waste into usable substances such as biogas. Its principle is to use the decomposition of anaerobic bacteria to pass organic matter (carbohydrates, proteins and fats) The digestion reaction converts to biogas. At present, the anaerobic digestion equipment used to treat high-solid sewage (solid content ≥ 5%) mainly includes buried anaerobic digesters, complete mixing reactors (CSTR), and upflow solid reactors (USR). [0003] (1) The buried anaerobic digester is in a natural sedimentation state in the diges...

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Problems solved by technology

[0003] (1) The buried anaerobic digester is in a natural sedimentation state in the digester, and the place where the anaerobic digestion activity is vigorous is limited to the active layer, so the treatment efficiency of the buried anaerobic digester is low

[0004] (2) The fully mixed reactor has a large volume and is easy to start, but its sludge residence time is equal to the hydraulic residence time, so it cannot accumulate sufficient concentration of sludge in the reactor, and the concentration of reactants in the reactor is reduced due to total mixing. Low, processing efficiency is not high

[0007] The scum on the liquid surface of the anaerobic reactor usually produces crusts. The domestic patent application CN102191172A discloses a biogas digester structure without crusting. Protrusions are set in the biogas digester body, and the fermentation chamber liquid is used for gas production and gas consumption. The lifting of the surface, the protrusions cut through the scum on the feed liquid in the fermentation chamber to achieve the effect of breaking the shell. The shell breaking strength and range of this shell breaking method are too small to be used in the reactor.

[0008] The upflow solid reactor usually increases the reaction contact time by increasing the internal circulation. The domestic patent CN101891302A discloses an internal circulation upflow anaerobic sludge bed reactor. The two ends of the reactor are equipped with overflow There is a three-phase separator in the middle of the outflow water weir, which is equipped with baffles on the reactor tank at both ends of the three-phase separator, and cooperates with the raised weir on the three-phase separator to increase internal circulation, but this internal circulation The circulation outlet of the method is a slender pipe, which is easy to cause blockage, and its circulation outlet is aimed at the sludge bed, which is easy to wash away the sludge, resulting in a decrease in concentration and a decrease in reaction efficiency

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