Anaerobic treatment method

Abstract

In an anaerobic treatment method in which contaminated water is introduced into an acidification tank to decompose polymer components in the contaminated water into organic acids, and the effluent from the acidification tank is introduced into a methane production tank containing non-biological fluidized carriers so as to convert the acids into methane, the treatment is carried out stably and continuously by preventing the occurrence of floating of carriers in the methane production tank. The CODcr concentration of polymer components other than organic acids in the acidification tank effluent to be introduced into the methane production tank is controlled to be not more than 300 mg / L. This control prevents the occurrence of acid production reactions in the methane production tank and the consequent proliferation of microorganisms, and thereby suppresses sticking of carriers as well as the occurrence of floating and blockage by the carriers.

Description

technical field [0001] The invention relates to a method of introducing treated water into an acid generating tank and decomposing the polymer components in the treated water into organic acids, and then introducing the effluent water from the acid generating tank into a methane generating tank filled with a fluid non-biological carrier for methane Anaerobic treatment method of fermentation treatment. Background technique [0002] As an anaerobic treatment method for organic waste water, large granular sludge with sedimentation properties is formed at a high density in the reaction tank, and the organic waste water containing soluble BOD is passed in an upward flow to form The UASB (Upflow Anaerobic Sludge Blanket: Upflow Anaerobic Sludge Blanket) method in which the state of the sludge bed (Sluge blanket) is contacted and treated at a high load and high speed. In this method, the solid organic matter with a slow digestion rate is separated and treated separately, and only ...

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Problems solved by technology

[0004] For these methods using granular sludge, the COD concentration in the effluent is higher (in COD Cr Concentration meter is about 2000mg / L or more), the efficiency is very high, but when the COD concentration is low (COD Cr Concentration meter is about 2000mg / L or less), so a large amount of water must flow into the reaction tank, and the particles are easy to flow out, sometimes unable to exert stable performance

[0005] When using these methods to treat wastewater of a type or composition that is difficult to form granules, the granules that were initially charged will slowly disintegrate and become inoperable.

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