PROBLEM TO BE SOLVED: To provide a water treatment apparatus and water treatment method that efficiently perform treatment on organic material in rearing water used in an aquarium, cultivation, etc. to enable stable supply of clarified rearing water whose chromaticity is reduced.SOLUTION: A water treatment apparatus 1 for circulating at least part of rearing water for aquatic biotas to perform treatment on organic material included in the rearing water comprises: a visible part absorbance measurement apparatus 14 for measuring visible part absorbance of rearing water from a water tank 10 in which the aquatic biotas are reared an ozone treatment apparatus 16 that has an ozone generator 24 for performing organic material treatment on the rearing water return piping 48 for returning at least part of treatment water on which the organic material treatment has been performed, to the water tank 10 and a control unit 30 for making the measured visible part absorbance and treatment strength of the ozone treatment apparatus 16 be interlocked.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】水族館や養殖等に用いられる飼育水の有機物の処理を効率よく行い、色度が低減された清澄な飼育水を安定して供給することができる水処理装置および水処理方法を提供する。【解決手段】水中生物の飼育水の少なくとも一部を循環させ、飼育水中に含まれる有機物の処理を行う水処理装置1であって、水中生物を飼育する水槽10からの飼育水の可視部吸光度を測定する可視部吸光度測定装置14と、飼育水の有機物処理を行うオゾン発生装置24を備えるオゾン処理装置16と、有機物処理を行った処理水の少なくとも一部を水槽10に返送する返送配管48と、測定した可視部吸光度とオゾン処理装置16における処理強度とを連動させる制御部30とを備える水処理装置1である。【選択図】図1
