TWI733660B - 有害物質含有液之淨化處理方法及用以實施其之有害物質含有液之淨化處理裝置 - Google Patents
有害物質含有液之淨化處理方法及用以實施其之有害物質含有液之淨化處理裝置 Download PDFInfo
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- TWI733660B TWI733660B TW105104593A TW105104593A TWI733660B TW I733660 B TWI733660 B TW I733660B TW 105104593 A TW105104593 A TW 105104593A TW 105104593 A TW105104593 A TW 105104593A TW I733660 B TWI733660 B TW I733660B
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Abstract
本發明提供一種有害物質含有液之淨化處理方法及用以實施其之有害物質含有液之淨化處理裝置,其使用高安全性氧化劑之溶存臭氧,可高效率地對有害物質含有液進行淨化處理。
本發明之有害物質含有液之淨化處理方法及用以實施其之有害物質含有液之淨化處理裝置,係於含有有害物質之有害物質含有液中添加、混合溶存臭氧之後,使上述含有液與BET比表面積為80m2/g以上之吸附臭氧且吸附有害物質之含過渡金屬氧化物接觸而流過,以促進上述有害物質之藉由溶存臭氧之氧化,從而進行高效率之氧化分解。
Description
本發明係關於一種含有各種有機系污染物、惡臭成分、細菌類等有害物質之液(以下稱為有害物質含有液)之無害化處理方法及無害化處理裝置,尤其是關於藉由高安全性氧化劑之溶存臭氧處理而提高無害化效率的有害物質含有液之淨化處理方法及裝置。本發明對供水和污水之淨化處理、或養殖水槽中之淡水或海水之淨化較為有用。
作為含有有機系污染物等有害物質之污染液之無害化處理方法之一,有生物活性處理,但依存於微生物之生物化學反應,故其處理速度較慢,又,需要分解有害物質之微生物槽,而其操作、維護需要極多之注意與經驗。有機系污染物等有害物質之微生物之分解一般係於好氧性環境氣體中進行有害物質之氧化,但於藉由消化菌去除屬於惡臭成分之氨之方面,留有氨氧化後之pH值調整、硝酸之處理等問題。另一方面,作為以低濃度含有各種COD(Chemical Oxygen Demand,化學需氧量)成分或氨等惡臭成分等有害物質之水之無害化處理方法之一,有利用臭氧之氧化分解處理方法。而且,為了提高其處理效率,業界提出各種方案。例如,亦嘗試過利用含
氧鹵化物或過氧化氫等水溶性氧化劑與溶存臭氧之混合溶液的氧化處理方法(專利文獻1、2),但低濃度有害物質與水溶性氧化劑或水溶性氧化劑與溶存臭氧之混合溶液的反應速度並沒有那麼大,因此尚未達到單獨形式之實用化。然而,水溶性氧化劑與溶存臭氧之混合溶液會進行自分解,因此該等殘存於處理液中而對人體產生影響之危險性較少,從而被預測今後將會作為清潔之處理劑而擴大利用領域,若可利用作為處理有害物質含有液之氧化劑,則將會被期待作為非常有效之處理方法。
又,關於利用溶存臭氧之有害物質之氧化分解處理,為了高效率地進行,業界提出一種關於吸附有害物質且吸附臭氧之高矽吸附劑(專利文獻3、4)。此外,近年來,替代使臭氧氣體溶解而獲得溶存臭氧之方法,業界提出一種藉由電解而直接製造臭氧水之方法及裝置,所得之臭氧水可利用於含有戴奧辛之有機氯化合物之分解、廢液處理等(專利文獻5、6)。
專利文獻1:日本專利特開2008-55312號公報
專利文獻2:日本專利特開2009-297629號公報
專利文獻3:日本專利第3377733號公報
專利文獻4:日本專利第3611278號公報
專利文獻5:日本專利第5113891號公報
專利文獻6:日本專利第5113892號公報
於上述之狀況下,本發明者等人意識到:利用溶存臭氧之淨化處理係藉由於有害物質含有液中注入溶存臭氧而進行,但通常作為處理對象之有害物質含有液中之有害物質之濃度非常地稀薄,故於有助於有害物質之氧化分解之前,會進行溶存臭氧之自分解,因此必需注入大大地超過化學計量比率之過量之溶存臭氧而不具備經濟性;此外,關於過量之溶存臭氧之注入,必需於其後對多餘之臭氧進行分解處理,於此方面亦不具備經濟性。又,意識到:除了上述之方面以外,亦取決於處理對象之有害物質,臭氧氧化反應速度並沒有那麼大的情況較多,從而存在無害化效率較低之問題,若該等方面不予以改善,則利用溶存臭氧之淨化處理之實用化較難實現。
因此,本發明之目的在於解決上述習知技術中之問題點,並提供一種有害物質含有液之淨化處理方法及用以實施其之有害物質含有液之淨化處理裝置,其係使用高安全性氧化劑之溶存臭氧,可高效率地對有害物質含有液進行淨化處理。
上述之目的藉由下述之本發明而達成。即,本發明提供一種有害物質含有液之淨化處理方法,其特徵在於:於含有有害物質之有害物質含有液中添加、混合溶存臭氧之後,使上述含有液與BET比
表面積為80m2/g以上之吸附臭氧且吸附有害物質之含過渡金屬氧化物接觸而流過,以促進上述有害物質之藉由溶存臭氧之氧化,從而進行高效率之氧化分解。
作為本發明之有害物質含有液之淨化處理方法之較佳形態,可列舉下述事項上述含過渡金屬氧化物係選自由Co、Mn及Cu所組成之群組中之至少任一種氧化物,或選自上述群組中之兩種以上之複合氧化物;上述含過渡金屬氧化物為Co、Mn及Cu之複合氧化物,或Co之氧化物;上述含過渡金屬氧化物係使用藉由選自Co、Mn及Cu中之至少任一種金屬鹽之水溶液或選自上述群組中之兩種以上之金屬鹽之混合水溶液與鹼溶液混合而生成之沈澱物來形成之含過渡金屬之氧化物之超微粒子;上述含過渡金屬氧化物之形狀為超微粒子,且擔載於蜂巢狀之高矽吸附劑;進而,對於使上述有害物質含有液流過而接觸之上述含過渡金屬氧化物,以於上游側或下游側配置共吸附上述有害物質與上述溶存臭氧之高矽吸附劑,從而使上述有害物質含有液與上述高矽吸附劑接觸而流過的方式構成;上述高矽吸附劑包含選自由高矽五元環沸石、去鋁八面沸石及中孔洞矽酸鹽所組成之群組中之任一種材料。
作為另一實施形態,本發明提供一種有害物質含有液之淨化處理裝置,其係用以實施上述任一種有害物質含有液之淨化處理方法者,其特徵在於具備:至少於內部以單獨或混合物之形態配置有上述含過渡金屬氧化物的吸附劑填充塔、用以供給有害物質含有液至該吸附劑填充塔的供給配管、與該供給管連接且用以添加溶存臭氧
於有害物質含有液中的溶存臭氧發生器、以及將淨化處理完畢之處理液自上述吸附劑填充塔排出的處理液排出配管。
作為本發明之有害物質含有液之淨化處理裝置之較佳形態,配置於上述吸附劑填充塔中之含過渡金屬氧化物之單獨或混合物之形態係選自由超微粒子粉體、粒狀、丸狀、拉西環狀及蜂巢狀所組成之群組中之任一種。
根據本發明之有害物質含有液之淨化處理方法,於有害物質含有液之藉由溶存臭氧之處理中,使用可高效率地吸附溶存臭氧且吸附有害物質之吸附劑,藉此可提高溶存臭氧之混合溶液之有效利用率,從而可進行處理速度快且效率高之供水和污水之淨化處理、以及養殖水槽之淡水或海水之淨化。又,由於溶存臭氧之混合溶液之利用率(對有害物質之氧化等之貢獻率)提高、及溶存臭氧之混合溶液之吸附力較高等,故洩漏至被排出之處理完畢之液中之溶存臭氧量亦較少,進而,可根據需要,藉由設置活性碳等溶存臭氧之分解劑層而完全地防止溶存臭氧之洩漏。又,根據本發明之裝置,可以較高之效率且較低之操作成本進行有害物質含有液之藉由溶存臭氧之處理。
1‧‧‧主工廠
2‧‧‧排液導出(供給)配管
3‧‧‧排液輸送泵
4‧‧‧與溶存臭氧之混合器
5‧‧‧溶存臭氧發生器
6‧‧‧吸附劑填充塔
6a‧‧‧吸附劑層
6b‧‧‧包含水溶性氧化劑或水溶性氧化劑與溶存臭氧之混合溶液之分解劑層
6c‧‧‧隔板
7‧‧‧處理液排出配管
圖1係表示本發明之淨化處理方法之處理流程之一例的示意性概要圖。
圖2係表示實施例5中之SV值與屬於處理對象之三氯苯去除率之關係的圖。
圖3係表示實施例6中之溶存臭氧與處理對象之三氯苯之質量比、與三氯苯去除率之關係的圖。
列舉本發明之較佳實施形態來詳細地說明本發明。本發明之有害物質含有液之淨化處理方法之特徵在於:將下述設為基本構成,(A)於有害物質含有液中添加混合溶存臭氧、(B)使之流過填充有吸附溶存臭氧且亦吸附有害物質之特定吸附劑的填充塔、及(C)藉由溶存臭氧之作用對液中之有害物質進行無害化,於此時,作為吸附劑,係使用BET比表面積為80m2/g以上之含過渡金屬氧化物。
於本發明中,作為淨化處理對象之有害物質含有液,例如,可列舉符合環境局所指定之COD(chemical oxygen demand,化學需氧量)限制值之有害物質顯示為高值之排水、或含有屬於惡臭物質之氨等之養殖水槽之水等。
作為本發明所使用之用以供給溶存臭氧之溶存臭氧之混合溶液發生器(臭氧發生器),公知之無聲放電方式、紫外線燈方式、水電解方式、或近年來所提出之藉由電解而直接製造臭氧水之方式等中之任一方式者均可應用。作為於有害物質含有液中添加溶存臭氧之方法,一般為於上游配置之噴射器中抽吸溶存臭氧而使之與處理對象之有害物質含有液混合的方法、及利用插入至液相中之氣相臭
氧之散氣管產生微泡而藉由氣-液接觸來注入的方法。溶存臭氧之添加量只要根據處理對象之有害物質含有液中之有害物質之種類、濃度等適當設定即可,但於習知所進行之通常之污水液處理中,相對於1莫耳之有害物質為1~20莫耳,較佳為3~10莫耳左右。
本發明所使用之吸附劑係吸附溶存臭氧且吸附有害物質者,其中,其特徵在於:其係BET比表面積為80m2/g以上之含過渡金屬氧化物。作為本發明所使用之更佳吸附劑,可列舉選自由Co、Mn及Cu所組成之群組中之至少任一種含過渡金屬氧化物、或選自上述群組中之兩種以上之複合氧化物,尤佳為超微粒子。
如上所述,已知藉由使用吸附有害物質且吸附臭氧之高矽吸附劑,可謀求利用溶存臭氧之有害物質之氧化分解處理之效率提高。本發明者等人意識到即便利用此種習知技術亦不充分,為了達到實用化,要求利用溶存臭氧之有害物質之氧化分解處理之進一步效率提高,於是努力地進行研究,結果完成了本發明。具體而言,本發明者等人發現:藉由使用具有本發明特徵之「BET比表面積為80m2/g以上之含過渡金屬氧化物」,臭氧氧化反應速度將會加快而使無害化高效率地進行,從而完成本發明。此外,經確認:由於本發明中較適宜之含過渡金屬氧化物為超微粒子,故可容易地與習知技術所提出之吸附有害物質且吸附臭氧之高矽吸附劑併用,藉由如此之構成可實現利用溶存臭氧之有害物質之氧化分解處理之進一步效率提高。
關於藉由使用具有本發明特徵之「BET比表面積為80m2/g以上之含過渡金屬氧化物」,可達成利用溶存臭氧之有害物質之氧化分解處理之效率提高的原因,本發明者等人認為其原因如下。本發明所使用之含過渡金屬氧化物係作為同時吸附溶存臭氧與有害物質之吸附劑而發揮功能,此外,於該吸附劑中,臭氧及有害物質被濃縮,從而,於吸附劑之晶體(或非晶質)構造內,臭氧不會被分解而被吸附,其結果,產生使有害物質被高效率地氧化分解之效果。如上所述,具有本發明特徵之吸附劑係BET比表面積高達80m2/g以上而具有大量吸附部位,從而可實現對來自液中溶存臭氧之臭氧的較高吸附能力,而且所吸附之溶存臭氧本身於混合溶液中之分解率較低,且亦具有吸附有害物質之特性,因此可於液相中對有害物質進行穩定之臭氧氧化處理。
以下,對作為具有本發明特徵之吸附劑而有用之選自由Co、Mn及Cu所組成之群組中之至少任一種含過渡金屬氧化物、或選自該群組中之兩種以上之複合氧化物進行說明。具體而言,以由Co、Mn及Cu三種所組成之複合氧化物及Co氧化物為例進行說明。
本發明中較適宜之Co、Mn及Cu之複合氧化物之製備較佳係利用以下之濕式法進行,利用此種方法所製備之複合氧化物係平均粒徑為0.1μm以下之超微粒子,且其BET比表面積容易達到80m2/g以上。首先,準備Co、Mn、Cu之各金屬鹽水溶液與鹼水溶液,於水介質中滴加該等水溶液,以使各金屬之共同沈澱物析出。繼而,對所得之共同沈澱物進行過濾、水洗、乾燥後,於100~500℃之範圍
內進行熱處理,藉此可獲得目標之超微粒子之含有Co、Mn及Cu之複合氧化物。作為上述所使用之金屬鹽水溶液之製備中使用之各金屬之鹽,只要為市售之金屬鹽則均可使用,例如,可使用硫酸鹽、硝酸鹽、氯化物等。又,作為上述鹼水溶液之製備中使用之鹼,可使用苛性鈉、蘇打灰、小蘇打等一般性之鹼。關於所混合之三種金屬鹽之比率,較適宜為:以各金屬之相對於整體之莫耳比計,Co為40莫耳%以下,Mn為30~70莫耳%,Cu為25~45莫耳%之範圍。又,關於所使用之金屬鹽水溶液之濃度,大約為5~50質量%之範圍較為適合。
作為沈澱條件,若沈澱pH值處於各過渡金屬沈澱範圍之pH值範圍內,則可析出微細之沈澱,大約5~14之範圍較為適合。又,根據本發明者等人之研究,藉由於沈澱析出時促進液相中之氧化,可有利於後段之熱處理時之反應特性。因此,藉由通氣之起泡或氧化劑之添加亦具有效果。作為在上述目的中可使用之氧化劑,可使用氯酸鈉、次氯酸鈉或該等之鉀鹽、過氧化氫等。上述所得之沈澱物接近非晶質,為了使其特性穩定,較為有效的是進行熱處理,作為熱處理溫度,較佳為100~500℃之範圍。若熱處理溫度過高,則所得之氧化物粒子之比表面積減少,從而吸附部位減少,故在用於有害物質含有液之淨化時之處理能力降低,因而欠佳。以上述之方式而獲得之Co、Mn及Cu之複合氧化物之平均粒徑較佳為0.1μm以下。BET比表面積為80m2/g以上,進而較理想為100m2/g以上。
繼而對Co氧化物之製備進行說明,但基本上與上述之複合氧化
物之情形相同。首先,準備Co之金屬鹽水溶液與鹼水溶液,於水介質中滴加該等而使Co之沈澱物析出。繼而,對所得之沈澱物進行過濾、水洗、乾燥後,於100~800℃之範圍內進行熱處理,藉此可獲得目標之超微粒子之含Co氧化物。此時所使用之Co金屬之鹽,只要為市售之金屬鹽則均可使用,可使用硫酸鹽、硝酸鹽、氯化物等。又,關於所使用之鹼,可使用苛性鈉、蘇打灰、小蘇打等一般性之鹼。又,關於金屬鹽之濃度,大約5~50質量%之範圍較為適合。作為沈澱條件,若沈澱pH值處於Co金屬沈澱範圍之pH值範圍內,則可析出微細之沈澱,大約5~14之範圍較為適合。所得之沈澱物接近非晶質,但一部分結晶化,進而為了特性之穩定化,較有效為進行熱處理,作為熱處理溫度,較佳為100~800。℃之範圍。若熱處理溫度過高,則所得之氧化物粒子之比表面積減少,從而吸附部位減少,故在用於有害物質含有液之淨化時之處理能力降低,因而欠佳。以上述之方式而獲得之Co氧化物之平均粒徑較佳為0.1μm以下。BET比表面積為80m2/g以上,進而較理想為100m2/g以上。
關於上述之本發明所使用之含過渡金屬氧化物,若其BET比表面積不存在問題,則利用所謂之「乾式混合法」亦可製造,該方法係組合各金屬之氧化物或碳酸鹽、鹼性碳酸鹽、草酸鹽等而進行乾式混合並燒成。然而,各金屬之氧化物等之混合原料之一次粒子較大,於乾式混合後進行燒成而獲得之粉末之粒徑以次微米為極限,該極限以下之粒徑將難以製成。因此,將會成為比表面積為數m2/g左右且吸附部位較少之粉末,從而無法成為本發明所規定之BET比表面積為80m2/g以上之含過渡金屬氧化物。相對於此,利用上述記
載之「濕式法」所獲得之含過渡金屬氧化物之粒徑為0.02~0.1μm,例如,可獲得0.05μm左右之超微粒子,根據情形可獲得比表面積超過100m2/g之含過渡金屬氧化物,因而成為對本發明之有害物質含有液之淨化處理方法極為有用者。
本發明者等人於進行溶存臭氧之吸附試驗中發現:上述之特定吸附劑可高效率地吸附溶存臭氧,而且藉由吸附屬於處理對象之有害物質的臭氧,可高效率地進行無害化,基於該結果而完成本發明。即,若於由具有本發明特徵之含過渡金屬氧化物所構成之吸附劑的存在下,使有害物質與溶存臭氧之混合溶液流過,並使該等共存,則混合液中之溶存臭氧與有害物質將會吸附於吸附劑,結果混合液中之有害物質之藉由吸附有溶存臭氧之臭氧而進行之氧化分解將會高效率地進行,從而可獲得本發明之顯著效果。
雖非限定本發明者,若以氨之藉由溶存臭氧之促進反應為例示,則可考慮下述之氧化分解機制。液中之溶存臭氧之液相氧化分解反應係與溶存臭氧之混合溶液濃度[O3]與有害物質濃度[NH4OH]之乘積[O3]‧[NH4OH]成比例而進行。另一方面,由於構成本發明之吸附劑相有選擇性地且同時地吸附溶存臭氧與有害物質,故與不存在吸附劑之單一液相相比,吸附劑內之溶存臭氧濃度[O3]及有害物質濃度[NH4OH]分別達到10~100倍左右。因此,預測吸附劑表面之[O3]‧[NH4OH〕達到液相中之100~10000倍。
又,作為本發明之值得特別說明之特長,可列舉習知之使用消化菌之NH4OH之氧化分解中生成之HNO3或HNO2,於具有本發明特徵之過渡金屬超微粒子材料上之NH4OH-O3反應中幾乎不生成。即,認為:於具有本發明特徵之吸附劑上之臭氧與氨之反應係由下述之(1)~(4)中之至少任一項所構成。由本發明者等人之研究確認:於本發明之淨化處理方法中,存在(1)、(2)>>(3)、(4)之反應之選擇性,且幾乎不生成HNO3、HNO2。
(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
具有本發明特徵之吸附劑可分別根據使用目的而以單獨或混合物之形態來使用,例如,可直接作為超微粒子粉體,或成形為粒狀、丸狀、拉西環狀、蜂巢狀等任意之形狀來使用。例如,較佳為以下之構成:使習知技術中使用之吸附臭氧且吸附有害物質之高矽吸附劑形成為蜂巢狀,並使之擔載有以上述之方式獲得之含過渡金屬氧化物之超微粒子粉體。
具有本發明特徵之吸附劑之使用量會根據其使用目的而有所不同。例如,若設為除溶存臭氧以外亦併存有含氧鹵化物或過氧化氫等水溶性氧化劑之系統時,則通常於污染物質為1~1000ppm(w/w)、水溶性氧化劑與溶存臭氧之混合溶液量為1~10000ppm(w/w)之條件下,以每1m3之吸附劑之流量[m3/h]之SV值計,為1~250(l/h)左右。具有本發明特徵之吸附劑之性能會根據其使用目
的而有所不同,但如下所述,其顯示出80%以上之非常高之去除率。
根據本發明者等人之研究,於液相中,溶存臭氧會與有害物質以外之第三物質碰撞而無助無害化,且分解次數較多,因而藉由溶存臭氧之無害化之效率有限。然而,藉由使用具有本發明特徵之吸附劑,於本發明所能進行之吸附劑表面之藉由溶存臭氧之有害物質之無害化處理中,吸附劑將會有選擇性地吸附溶存臭氧及有害物質,因此與第三物質之碰撞所導致之溶存臭氧之分解的機率將會大幅度地降低,從而使溶存臭氧用於有害物質之無害化而有選擇性地且有效率地被消耗。
於液相中之有害物質之無害化處理效率較差之習知方法(例如,使用消化菌之生物活性處理)中,通常有裝置體積較大;因液組成之變動、競爭之微生物之侵入而消化菌之活性大幅度地降低之顧慮,從而強烈要求於經濟性、保守性方面予以改善。關於上文所列舉作為習知技術之有害物質之藉由水溶性氧化劑或該水溶性氧化劑與溶存臭氧之混合溶液氧化反應之均勻液相反應之排水處理,其效率非常低,因此未曾被單獨採用過,但已被採用作為生物活性處理之下游處理以減少一般性之COD成分。然而,以此方式,設置於生物活性處理之上游,有因洩漏溶存臭氧而導致生物活性槽之性能降低的顧慮,因此未曾被採用。相對於此,於本發明之有害物質含有液之淨化處理方法中,未反應之溶存臭氧會以被具有本發明特徵之吸附劑吸附之狀態滯留,因此幾乎沒有向下游洩漏之虞,且根據本發明者等人之研究,洩漏之溶存臭氧濃度為習知之1/10以
下,未必需要設置用於分解洩漏之溶存臭氧的分解劑層。
然而,於本發明中,亦作為特殊細菌之殺菌等而添加大量溶存臭氧之情形、或因一些原因而未反應之溶存臭氧洩漏之情形之對策,較佳為於進行溶存臭氧無害化(淨化)處理之吸附劑填充塔之處理液出口部分設置用以分解洩漏之溶存臭氧的分解劑層。以如此之構成,可確實地分解未反應之溶存臭氧。作為此情形所使用之溶存臭氧之混合溶液分解劑,可列舉與洩漏之溶存臭氧接觸而自行被氧化為CO2之消耗型吸附劑的活性碳或氧化鋁系化合物等。再者,分解劑層亦可設於吸附劑填充塔之出口部分之內側,又,亦可另行設於填充塔之外側。如上所述,於本發明之有害物質含有液之淨化處理方法中,由於洩漏之溶存臭氧之濃度較低,故溶存臭氧之交換頻率亦可達到大幅度地延長為習知之10倍左右,從而可實現經濟性之處理。
再者,可根據需要,於向有害物質含有液之溶存臭氧之混合溶液注入點之上游側及/或溶存臭氧之混合溶液吸附反應器(吸附劑填充塔)之下游側,設置去除液中之粉塵的過濾材料層。過濾材料層之設置與否、設置位置等只要根據裝置之狀況、有害物質含有液之性狀等適當地予以規定即可。
繼而,參照圖式對本發明之處理裝置進行說明。圖1係表示於來自工場排水之排液處理中應用本發明之有害物質含有液之淨化處理方法之有害物質含有液之處理流程之一例。於圖1中,來自主
工廠1之有害物質含有液利用排液輸送泵3經由排液導出配管2被送至與溶存臭氧混合之混合器4中,臭氧自臭氧發生器5注入而作為含有溶存臭氧之排水被導入至吸附劑填充塔6中。吸附劑填充塔6中填充有具有本發明特徵之特定吸附劑,導入液中之有害物質及溶存臭氧共同共吸附於吸附劑,於高濃度之狀態下進行反應而使有害物質被臭氧氧化分解。通常溶存臭氧不會向自處理液排出配管7排出之處理完畢之處理液洩漏,但亦可根據需要於吸附劑填充塔6內之處理液出口側或吸附劑填充塔6之下游設置活性碳等溶存臭氧之分解劑層。再者,圖1係表示於吸附劑填充塔6內之吸附劑層6a之處理液出口側,經由隔板6c設置溶存臭氧分解劑層6b之例。溶存臭氧分解劑層6b包含水溶性氧化劑或水溶性氧化劑與溶存臭氧之混合溶液。
以下列舉實施例、比較例及參考例來更詳細地說明本發明。除非另有註明,否則文中記載之「份」及「%」為質量基準。
使用圖1所示之流程圖之試驗裝置(但,洩漏之溶存臭氧之分解劑層6b未設置),進行藉由溶存臭氧之液中之三氯苯之淨化處理試驗。所使用之各吸附劑示於表1。又,裝置之構成與試驗條件等示於表2。具體而言,以使溶存臭氧與三氯苯之質量比成為1.5之方式設定含有10ppm之三氯苯之模擬排液而進行淨化處理。然後,測定於圖1所示之處理液排出配管7之部分所抽取之各處理液中之三氯苯濃度及溶存臭氧濃度,分別將測定結果以出口濃度之形式示於表3。
作為吸附劑,使用下述之S-1~S-5五種。作為「S-1」,只使用由高矽沸石之Ultra Stable Y-type Zeolite(超穩定Y型沸石,以下簡略記為USY)(SiO2/Al2O3比為200)所構成之具有蜂巢構造之基材,設為比較例1。關於蜂巢構造,板厚為0.2mm,間距為2mm,吸附劑之形狀設為圓筒。作為「S-2」,使用於上述蜂巢基材擔載Co氧化物超微粒子(粒徑為0.02μm,比表面積為100m2/g)而成者,設為實施例1。作為「S-3」,使用於上述蜂巢基材擔載Co、Mn及Cu之複合氧化物超微粒子(Co:Mn:Cu=0.2:0.7:0.4之組成(莫耳比))而成者,設為實施例2。作為(S-4),將前方使用上述「S-1」、後方使用上述「S-2」、填充該等(以1:1之體積比)而成者用於吸附劑,設為實施例3。作為「S-5」,將前方使用上述「S-1」、後方使用上述「S-3」、填充該等(以1:1之體積比)而成者用於吸附劑,設為實施例4。進而,除上述以外,作為「S-6」,不使用吸附劑而於未填充之狀態下進行處理而成者,設為參考例1。
上述所使用之超微粒子分別以下述之方式進行製備。關於構成「S-2」之Co氧化物超微粒子之製備,首先,製備使56.8份之硫酸鈷溶解於100份之溶解水中的硫酸鈷水溶液。繼而,作為鹼溶液,製備使25份之蘇打灰溶解於100份之溶解水中的鹼水溶液。一邊攪拌,一邊於預先準備好的210份之沈澱用水中滴加該等水溶液,將滴加後之pH值調整為7,從而製成目標之Co氧化物前驅物。所得之Co氧化物前驅物於其後進行水洗、乾燥,於300。℃下進行熱處理,從而獲得目標之Co氧化物超微粒子。所得之Co氧化物超微粒子之粒
徑為0.02μm,比表面積為100m2/g。
關於構成「S-3」之Co、Mn及Cu之複合氧化物超微粒子(Co:Mn:Cu=0.2:0.7:0.4之組成(莫耳比))之製備,使用混合鹽水溶液,並以幾乎與「S-2」之製備順序同樣之方式進行。具體而言,混合鹽水溶液係將34.9份之硫酸銅、44份之硫酸錳、18.3份之硫酸鈷溶解於300份之溶解水中而製備。作為沈澱劑之鹼水溶液係將42.6份之苛性鈉溶解於320份之溶解水中而製備。一邊攪拌,一邊於預先準備好的270份之沈澱水中滴加該等水溶液,將滴加後之pH值調整為12.5,從而製成目標之Co、Mn及Cu之複合氧化物超微粒子前驅物。此時,為了促進液相中之氧化,添加24份之稀釋為35%之過氧化氫。所得之前驅物進行水洗、乾燥,於300℃下進行熱處理,從而獲得目標之Co、Mn、Cu之複合氧化物超微粒子。所得之Co、Mn及Cu之複合氧化物超微粒子之粒徑為0.05μm,比表面積為200m2/g。
使用具有與「S-1」之構成同樣之蜂巢構造的USY製之圓筒狀之基材,於上述基材分別擔載以上述之方式所得之Co氧化物超微粒子與Co、Mn及Cu之複合氧化物超微粒子,以獲得「S-2」、「S-3」之吸附劑,於表1所示之各態樣下供性能評價試驗使用。將各性能評價試驗(淨化處理試驗)所使用之吸附劑之構成之概要示於表1。又,將此時所使用之裝置之構成與試驗條件等示於表2。
將評價試驗結果示於表3。如上所述,評價試驗係將處理對象設為含有10ppm之三氯苯的模擬排液,以使溶存臭氧濃度成為15ppm之方式於該排液中添加溶存臭氧,以使溶存臭氧與三氯苯之質量比成為1.5之方式設定而進行淨化處理。關於評價,測定於圖1所示之處理液排出配管7之部分(出口部分)所抽取之處理液中之三氯苯濃度與臭氧濃度,算出出口/入口三氯苯濃度比而設為三氯苯之去除率,算出出口/入口O3濃度比而設為臭氧之去除率,將該等值示於表3。又,於表3中,將不使用吸附劑、僅添加溶存臭氧而進行淨化處理之參考例之結果作為標準,相對地判斷實施例及比較例之結
果,以下述之標準顯示評價結果。即,將與參考例1之去除率相比顯示3倍以上之去除率之情形評價為◎,將顯示2.5倍以上之去除率之情形評價為○,將顯示2倍以上之去除率之情形評價為△。
如表3所示,於三氯苯之藉由溶存臭氧之分解中,「S-1」~「S-5」均大大地超過參考例1之未填充之三氯苯去除率30%。然而,關於屬於已公知之促進氧化法的藉由高矽沸石之分解,其上限為70%左右。於此方面發現:擔載過渡金屬超微粒子之蜂巢之「S-2」、「S-3」為75%、80%,相對於習知技術具有優越性。此外,關於在高矽沸石「S-1」之下游填充「S-2」、「S-3」之填充有高矽沸石與過渡金屬超微粒子兩種的部分填充,(S-4)為90%,「S-5」為95%,分解性能進一步地提高。
使用於以上所進行之評價試驗中顯示最高之三氯苯去除率的「S-5」之吸附劑構成,與以上所進行之評價試驗同樣,於反應溫度為25℃、溶存臭氧/三氯苯質量比為1.5(w/w)之條件下,以1~40[l/h]變更SV值來進行淨化試驗。然後,使用所得之三氯苯去除率進
行評價。「S-5」之吸附劑構成設定為:吸附劑填充塔之液流之前方配置「S-1」、後方配置「S-3」、兩者之體積比成為1:1。吸附劑之形狀具有蜂巢(板厚為0.2mm,間距為2mm)構造。經確認:其結果如圖2所示,於SV值1~40[l/h]之整個範圍內,屬於對象有害物質之三氯苯之去除率為90%以上,效率極高。
與實施例5同樣地使用於以上所進行之評價試驗中顯示最高之三氯苯去除率的「S-5」之吸附劑構成,將SV值固定為10[l/h],變更對處理對象之三氯苯所添加之溶存臭氧之量而進行淨化試驗。具體而言,以0.5~3變更溶存臭氧/三氯苯質量比(w/w),以所得之三氯苯去除率進行評價。經確認:其結果如圖3所示,於溶存臭氧/三氯苯質量比(w/w)1~3之整個範圍內,三氯苯去除率為90%以上之高效率。又,如圖3所示,可知:於該處理條件下,溶存臭氧/三氯苯質量比為0.7,且即便減少溶存臭氧量,三氯苯去除率亦維持在80%。
使用圖1之流程之試驗裝置(但,洩漏之溶存臭氧的分解劑層6b未設置),進行氨之藉由溶存臭氧之處理試驗。所使用之吸附劑與表1相同,且試驗條件等與表2所示者相同。即,於氨之處理試驗中,處理對象設為含有10ppm之氨的模擬排液,以使溶存臭氧濃度成為15ppm之方式於該排液中添加溶存臭氧,以使溶存臭氧與氨之質量比成為1.5之方式設定而進行淨化處理。其他則於表2之條件下進行淨化處理。關於評價,與含三氯苯排水之情形同樣,測定於圖1所
示之處理液排出配管7之部分(出口部分)所抽取之處理液中之氨濃度與臭氧濃度,算出氨去除率與臭氧去除率,將結果示於表4。
根據表4,於氨之藉由溶存臭氧之分解中,「S-1」~「S-5」均大大地超過參考例2之未填充之氨去除率10%。又,如表4所示,於已公知之促進臭氧氧化之比較例2之使用具有蜂巢構造之USY製成之基材之系統之分解中,亦以氨去除率為85%左右,獲得較高之分解性。相對於此,如表4所示,擔載過渡金屬超微粒子之蜂巢的「S-2」、「S-3」為88%、90%,從而可確認:與比較例2之使用具有蜂巢構造之USY製成之基材之系統相比,於氨分解方面具有優越性。此外,於在包含比較例2之具有蜂巢構造之USY製成之基材的吸附劑「S-1」之下游填充有「S-2」之以「S-4」作為吸附劑之實施例9、或填充有「S-3」之以「S-5」作為吸附劑之實施例10中,「S-4」為95%,「S-5」為98%,可知:氨之藉由臭氧之分解性能進一步地提高。關於評價,氨去除率為90%以上之情形評價為◎,80%以上之情形評價為○。
1‧‧‧主工廠
2‧‧‧排液導出(供給)配管
3‧‧‧排液輸送泵
4‧‧‧與溶存臭氧之混合器
5‧‧‧溶存臭氧發生器
6‧‧‧吸附劑填充塔
6a‧‧‧吸附劑層
6b‧‧‧包含水溶性氧化劑或水溶性氧化劑與溶存臭氧之混合溶液之分解劑層
6c‧‧‧隔板
7‧‧‧處理液排出配管
Claims (6)
- 一種有害物質含有液之淨化處理方法,係於含有有害物質之有害物質含有液中添加並混合溶存臭氧之後,使上述含有液與BET比表面積為80m2/g以上之吸附臭氧且吸附有害物質之含過渡金屬之氧化物接觸而流過,促進上述有害物質之藉由溶存臭氧之氧化,並進行80%以上之高效率之氧化分解;其特徵在於:上述含過渡金屬之氧化物為由Co、Mn及Cu三種所組成之複合氧化物,且為使用藉由Co、Mn及Cu之各金屬鹽之混合水溶液與鹼水溶液混合而共同沈澱之沈澱物所形成的平均粒徑為0.1μm以下之超微粒子。
- 如請求項1之有害物質含有液之淨化處理方法,其中,上述含過渡金屬之氧化物之形狀為超微粒子,且擔載於蜂巢狀之高矽吸附劑。
- 如請求項1之有害物質含有液之淨化處理方法,其進而以下述方式構成:對於使上述有害物質含有液流過而接觸之上述含過渡金屬之氧化物,於上游側或下游側配置共吸附上述有害物質與上述溶存臭氧之高矽吸附劑,使上述有害物質含有液與上述高矽吸附劑接觸而流過。
- 如請求項2之有害物質含有液之淨化處理方法,其中,上述高矽吸附劑包含選自由高矽五元環沸石、去鋁八面沸石及中孔洞矽酸鹽所組成之群組中之任一種材料。
- 一種有害物質含有液之淨化處理裝置,其係用以實施請求項1至4中任一項之有害物質含有液之淨化處理方法者,其特徵在於具備:至少於內部以單獨或混合物之形態配置有上述含過渡金屬之氧 化物的吸附劑填充塔、用以供給有害物質含有液至該吸附劑填充塔的供給配管、與該供給管連接且用以添加溶存臭氧於有害物質含有液中的溶存臭氧發生器、以及將淨化處理完畢之處理液自上述吸附劑填充塔排出的處理液排出配管。
- 如請求項5之有害物質含有液之淨化處理裝置,其中,配置於上述吸附劑填充塔中之含過渡金屬之氧化物之單獨或混合物之形態係選自由超微粒子粉體、粒狀、丸狀、拉西環狀及蜂巢狀所組成之群組中之任一種。
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CN109019824B (zh) * | 2018-09-17 | 2021-08-27 | 深圳市南科大资产经营管理有限公司 | 一种高效催化氧化有机废水处理系统 |
CN113101942A (zh) * | 2021-03-11 | 2021-07-13 | 江西省东茂环保材料有限公司 | 一种用于臭氧催化氧化的分子筛复合催化材料及其制备方法 |
CN116393132A (zh) * | 2023-04-17 | 2023-07-07 | 中国科学技术大学 | 四氧化三钴/铜单原子复合材料、其制备方法及其应用 |
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CN108137359A (zh) | 2018-06-08 |
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EP3333131A1 (en) | 2018-06-13 |
TW201711965A (zh) | 2017-04-01 |
CN108137359B (zh) | 2021-07-06 |
EP3333131B1 (en) | 2021-04-21 |
US10493423B2 (en) | 2019-12-03 |
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