JP2017064649A - 有害物質含有液の浄化処理方法及びこれを実施するための有害物質含有液の浄化処理装置 - Google Patents
有害物質含有液の浄化処理方法及びこれを実施するための有害物質含有液の浄化処理装置 Download PDFInfo
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- JP2017064649A JP2017064649A JP2015194360A JP2015194360A JP2017064649A JP 2017064649 A JP2017064649 A JP 2017064649A JP 2015194360 A JP2015194360 A JP 2015194360A JP 2015194360 A JP2015194360 A JP 2015194360A JP 2017064649 A JP2017064649 A JP 2017064649A
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Abstract
【解決手段】有害物質を含有する有害物質含有液に溶存オゾンを添加、混合した後、前記含有液を、BET比表面積が80m2/g以上である、オゾンを吸着し、且つ、有害物質を吸着する遷移金属含有酸化物と接触させて流し、前記有害物質の溶存オゾンによる酸化を促進させ、高効率な酸化分解を行なう有害物質含有液の浄化処理方法、及びこれを実施するための有害物質含有液の浄化処理装置。
【選択図】 なし
Description
液中の溶存オゾンの液相酸化分解反応は、溶存オゾンの混合溶液濃度〔O3〕と、有害物質濃度〔NH4OH〕の積〔O3〕・〔NH4OH〕に比例して進行する。一方、本発明を構成する吸着剤相には、溶存オゾンと有害物質が、選択的に且つ同時に吸着されるため、吸着剤が存在していない単なる液相に比べて、吸着剤内での溶存オゾン濃度〔O3〕及び有害物質濃度〔NH4OH〕は、それぞれ10〜100倍程度に達する。従って、吸着剤表面での〔O3〕・〔NH4OH〕は、液相中での100〜10000倍に達すると予想される。
すなわち、本発明を特徴づける吸着剤上でのオゾンとアンモニアとの反応は、下記の(1)〜(4)の少なくともいずれかから構成されると考えられる。本発明者らの検討によれば、本発明の浄化処理方法では、(1)、(2)>>(3)、(4)の反応の選択性があり、HNO3、HNO2が殆ど生成しないことを確認した。
(1):NH4OH+5/6O3→1/2N2+5/2H2O
(2):2NH4OH+7/3O3→2NO+5H2O
(3):NH4OH+4/3O3→HNO3+2H2O
(4):NH4OH+O3→HNO2+2H2O
[実施例1〜4、比較例1、参考例1];
図1に示したフロー図の試験装置(但し、リークした溶存オゾンの分解剤層6bは設けず)を用いて、溶存オゾンによる液中のトリクロロベンゼンの浄化処理試験を行った。使用した各吸着剤を表1に示した。また、装置の構成と試験条件等を表2に示した。具体的には、トリクロロベンゼン10ppmを含有する模擬排液を、溶存オゾンとトリクロロベンゼンの質量比が1.5になるように設定して浄化処理を行った。そして、図1に示した処理液排出配管7の部分でサンプリングした各処理液中におけるトリクロロベンゼン濃度及び溶存オゾン濃度を測定し、それぞれ出口濃度として表3に測定結果を示した。
先に行った評価試験で最も高いトリクロロベンゼン除去率を示した「S−5」の吸着剤構成を用い、先に行った評価試験と同様の、反応温度25℃、溶存オゾン/トリクロロベンゼン質量比1.5(w/w)の条件で、SV値を1〜40[1/h]で変更して浄化試験を行った。そして、得られたトリクロロベンゼン除去率を用いて評価した。「S−5」の吸着剤構成は、吸着剤充填塔における液の流れの前方に「S−1」を配置し、後方に「S−3」を配置し、両者の体積比が1:1となるようにした。吸着剤の形状は、ハニカム(板厚0.2mm、ピッチ2mm)構造を有する。この結果、図2に示したように、SV値1〜40[1/h]の全領域で、対象の有害物質であるトリクロロベンゼンの除去率は、90%以上と極めて高効率であることが確認された。
実施例5と同様に、先に行った評価試験で最も高いトリクロロベンゼン除去率を示した「S−5」の吸着剤構成を用い、SV値は10[1/h]と一定として、処理対象のトリクロロベンゼンに対する添加する溶存オゾンの量を変更して、浄化試験を行った。具体的には、溶存オゾン/トリクロロベンゼン質量比(w/w)を0.5〜3で変更して、得られたトリクロロベンゼン除去率で評価した。この結果、図3に示したように、溶存オゾン/トリクロロベンゼン質量比(w/w)1〜3の全領域で、トリクロロベンゼン除去率が90%以上の高効率であることが確認された。また、図3に示したように、この処理条件であれば、溶存オゾン/トリクロロベンゼン質量比が0.7と、溶存オゾン量を少なくしてもトリクロロベンゼン除去率80%が維持されることがわかった。
図1のフローの試験装置(但し、リークした溶存オゾンの分解剤層6bは設けず)を用いて、溶存オゾンによるアンモニアの処理試験を行った。使用した吸着剤は、表1と同一であり、試験条件等は表2に示したのと同一である。すなわち、アンモニアの処理試験では、処理対象を、アンモニア10ppmを含有する模擬排液とし、該排液に、溶存オゾン濃度が15ppmとなるように溶存オゾンを添加して、溶存オゾンとアンモニアの質量比が1.5になるように設定して浄化処理した。その他は、表2の条件で浄化処理した。評価は、トリクロロベンゼン含有排水の場合と同様に、図1に示した処理液排出配管7の部分(出口部分)でサンプリングした処理液中における、アンモニア濃度とオゾン濃度を測定し、アンモニア除去率と、オゾン除去率を算出して、結果を表4に示した。
2:排液導出(供給)配管
3:排液輸送ポンプ
4:溶存オゾンとの混合器
5:溶存オゾン発生器
6:吸着剤充填塔
6a:吸着剤層
6b:水溶性酸化剤又は水溶性酸化剤と溶存オゾンの混合溶液からなる分解剤層
6c:仕切
7:処理液排出配管
Claims (9)
- 有害物質を含有する有害物質含有液に溶存オゾンを添加、混合した後、前記含有液を、BET比表面積が80m2/g以上である、オゾンを吸着し、且つ、有害物質を吸着する遷移金属含有酸化物と接触させて流し、前記有害物質の溶存オゾンによる酸化を促進させ、高効率な酸化分解を行なうことを特徴とする有害物質含有液の浄化処理方法。
- 前記遷移金属含有酸化物が、Co、Mn及びCuからなる群から選ばれる少なくともいずれかの酸化物、或いは、前記群から選ばれる2種以上の複合酸化物である請求項1に記載の有害物質含有液の浄化処理方法。
- 前記遷移金属含有酸化物が、Co、Mn及びCuの複合酸化物、或いは、Coの酸化物である請求項1に記載の有害物質含有液の浄化処理方法。
- 前記遷移金属含有酸化物が、Co、Mn及びCuから選ばれる少なくともいずれかの金属塩の水溶液、或いは、前記群から選ばれる2種以上の金属塩の混合水溶液を、アルカリ溶液と混合することにより生成した沈殿物を用いて形成した超微粒子である請求項1〜3のいずれか1項に記載の有害物質含有液の浄化処理方法。
- 前記遷移金属含有酸化物の形状が超微粒子であり、且つ、ハニカム状の高シリカ吸着剤に担持されている請求項1〜4のいずれか1項に記載の有害物質含有液の浄化処理方法。
- 更に、前記有害物質含有液を流して接触させる前記遷移金属含有酸化物に対して、上流側又は下流側に、前記有害物質と前記溶存オゾンとを共吸着する高シリカ吸着剤を配置し、前記有害物質含有液を前記高シリカ吸着剤に接触させて流すように構成する請求項1〜5のいずれか1項に記載の有害物質含有液の浄化処理方法。
- 前記高シリカ吸着剤が、高シリカペンタシルゼオライト、脱アルミニウムフォージャサイト及びメソポーラスシリケートからなる群から選ばれるいずれかの材料からなるものである請求項5又は6に記載の有害物質含有液の浄化処理方法。
- 請求項1〜7のいずれか1項に記載の有害物質含有液の浄化処理方法を実施するための有害物質含有液の浄化処理装置であって、少なくとも前記遷移金属含有酸化物が単独又は混合物の形態で内部に配置されている吸着剤充填塔と、該吸着剤充填塔に有害物質含有液を供給するための供給配管と、該供給管に接続され、有害物質含有液中に溶存オゾンを添加するための溶存オゾン発生器と、前記吸着剤充填塔から浄化処理済みの処理液を排出する処理液排出配管とを備えてなることを特徴とする有害物質含有液の浄化処理装置。
- 前記吸着剤充填塔に配置されている遷移金属含有酸化物の単独又は混合物の形態が、超微粒子粉体、粒状、ペレット状、ラシヒリング状及びハニカム状からなる群から選択されるいずれかである請求項8に記載の有害物質含有液の浄化処理装置。
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