Wastewater treatment device and its start-up or restart method

Abstract

[Problem] This invention provides a novel wastewater treatment apparatus capable of maintaining excellent wastewater treatment capacity, and a method for starting or restarting the treatment apparatus. [Solution] The treatment apparatus 10 includes: a packed tower 20 having a catalyst layer 22 filled with a solid catalyst 21; a discharge pipe 30 connected to a position above the catalyst layer; and a liquid supply unit 40 capable of supplying liquid to a position below the catalyst layer. The liquid supply unit can supply either a first liquid 41 or a second liquid 42 with a COD (Cr) greater than that of the first liquid.

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