Biological treatment device and biological treatment method

Abstract

This makes it possible to decompose difficult-to-decompose substances with high efficiency even at low microbial concentrations. [Solution] A biological treatment device that decomposes substances to be decomposed using microorganisms, comprising a tubular member extending in the vertical direction, at least one upward flow generating section that generates an upward flow in an outer flow space formed outside the tubular member or an inner flow space formed inside the tubular member, and a plurality of blade sections, the inner flow space and the outer flow space being connected to each other on the upper and lower sides of the tubular member and configured to be able to form a circulation flow path that circulates a mixed liquid containing microorganisms and substances to be decomposed, and the plurality of blade sections are arranged so as not to be rotatable on the circulation flow path.

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