METHOD OF TREATING TO-BE-TREATED WATER CONTAINING HYDROGEN PEROXIDE AND HYDROGEN PEROXIDE REMOVAL APPARATUS

• Main Authors: YAMAOKA HIROYUKI, OTANI SHINICHIRO, SUHARA SADAYOSHI, KOKUBO KOJI, HARADA YOSHIKATSU, FUJII TERUAKI, TOYAMA KOICHIRO
• Format: Patent
• Language: English; Japanese
• Published: 30.10.2014
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide a method of treating drainage which decomposes hydrogen peroxide present in drainage to reduce the concentration of hydrogen peroxide to such a level as to allow easy reuse in cleaning of electronic parts and a hydrogen peroxide removal apparatus for realization of the method.SOLUTION: A hydrogen peroxide removal apparatus is provided with a method of decomposing hydrogen peroxide by adjusting the amount of oxygen dissolved in to-be-treated water containing hydrogen peroxide to a level equal to or lower than a predetermined value and decomposing hydrogen peroxide by using UV rays and a photocatalyst, a dissolved oxygen reduction unit, and a hydrogen peroxide decomposition tank housing a photocatalyst and a UV light source capable of irradiating the photocatalyst with UV rays. 【課題】 排水中に存在する過酸化水素を効果的に分解し、電子部品の洗浄に容易に再利用できるような濃度にまで低減することができる排水処理方法と、それを具現化する過酸化水素除去装置を提供する。【解決手段】 過酸化水素を含む被処理水中の溶存酸素を所定値以下にした上で、紫外線および光触媒を用いて過酸化水素を分解する方法と、溶存酸素低減装置と、光触媒と該光触媒に紫外線を照射可能な紫外線光源とを収容する過酸化水素分解槽とを備えた過酸化水素除去装置を提供する。【選択図】 図１