JP2013013846A - 排水の処理方法 - Google Patents
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Abstract
【解決手段】脱硫剤として使用後、回収されたリモナイト等の硫化水素と接触させたリモナイトを、直接、あるいは造粒または焼結して得られる固体触媒に、過酸化物等の前記固体触媒との反応により活性酸素種を生成する化合物を添加した排水を接触させ、フェントン様反応により生成するヒドロキシルラジカルを利用して排水中の有機化合物やアンモニア態窒素等を酸化分解する排水の処理方法。
【選択図】図1
Description
すなわち、本発明は下記の[1]〜[4]記載の排水の処理方法を提供する。
[1] 硫化水素、硫化物イオン、水硫化物イオン、チオールおよびスルフィドのいずれかと接触させたリモナイトを含む固体触媒に、前記固体触媒との反応により活性酸素種を生成する化合物を添加した排水を接触させる排水の処理方法。
[2] 前記固体触媒が、脱硫剤として使用後、回収されたリモナイトである上記[1]記載の排水の処理方法。
[3] 前記過酸化物が過酸化水素である上記[1]または[2]記載の排水の処理方法。
[4] 前記過酸化物が過酸化水素である上記[4]記載の排水の処理方法。
本発明の一実施の形態に係る排水の処理方法(以下、「排水の処理方法」または「処理方法」と略称する場合がある。)において、硫化水素と接触させたリモナイトを含む固体触媒に、過酸化物を添加した排水を接触させ、フェントン様反応により生成するヒドロキシルラジカルを利用して排水中の有機化合物やアンモニア態窒素等を酸化分解する。
(1)メチレンブルー水溶液の脱色実験
16μMメチレンブルー水溶液を70mLずつビーカーに取り、何も加えないもの(Blank)を2個、脱硫剤として使用したリモナイトを回収したもの(脱硫剤)、未処理のリモナイト(未処理)、リモナイトの焼結体(焼結)、炭酸水素ナトリウムを加えて焼結したもの(NaHCO3)をそれぞれ2.2gずつ添加したビーカーを各2個用意した。これらの5組のビーカーの一方にのみ、30%過酸化水素100μLを添加し、マグネチックスターラーで撹拌しながら、665nmでの吸光度の経時変化を測定した。過酸化水素を添加しなかった群における測定結果を図1(A)に、過酸化水素を添加した群における測定結果を図1(B)に示す。なお、吸光度は、撹拌開始直前の吸光度に対する百分率(C/C0(%))で示している。
難分解性のビリルビン水溶液および畜舎より回収した屎尿の試料を用いて、上記(1)と同様の手順により分解実験を行い、ビリルビンに由来する吸収帯の吸光度の経時変化を観測した。メチレンブルー水溶液を用いた実験と同様、脱硫剤として使用したリモナイトを回収したものを添加した試料については、ビリルビン水溶液および屎尿の両者とも、吸光度の急速な減少が観測された。
ヒドロキシルラジカルと反応して、2,3−または2,5−ジヒドロキシ安息香酸(DHBA)を生成するサリチル酸をトラップ剤として用い、ヒドロキシルラジカルの生成について検討を行った。
この結果から、脱硫剤として使用したリモナイトを回収したものを固体触媒として使用した場合、過酸化水素を添加すると、ヒドロキシルラジカルの濃度は速やかに増大し、数分以内で極大に達することが確認された。
Claims (4)
- 硫化水素、硫化物イオン、水硫化物イオン、チオールおよびスルフィドのいずれかと接触させたリモナイトを含む固体触媒に、前記固体触媒との反応により活性酸素種を生成する化合物を添加した排水を接触させることを特徴とする排水の処理方法。
- 前記固体触媒が、脱硫剤として使用後、回収されたリモナイトであることを特徴とする請求項1記載の排水の処理方法。
- 前記固体触媒との反応により活性酸素種を生成する前記化合物が過酸化物であることを特徴とする請求項1または2記載の排水の処理方法。
- 前記過酸化物が過酸化水素であることを特徴とする請求項3記載の排水の処理方法。
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Cited By (2)
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JP2016098460A (ja) * | 2014-11-21 | 2016-05-30 | カースル株式会社 | 機能性不織布 |
CN107720930A (zh) * | 2017-11-20 | 2018-02-23 | 华东理工大学 | 一种含硫化物的工业废水处理用试剂及其反应方法 |
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Cited By (2)
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JP2016098460A (ja) * | 2014-11-21 | 2016-05-30 | カースル株式会社 | 機能性不織布 |
CN107720930A (zh) * | 2017-11-20 | 2018-02-23 | 华东理工大学 | 一种含硫化物的工业废水处理用试剂及其反应方法 |
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