オゾンおよび過酸化水素併用処理におけるノニルフェノールエトキシレートの分解特性  [in Japanese] Decomposition Characteristics of Nonylphenol Ethoxylates by Ozonation and Ozone/Hydrogen Peroxide Process  [in Japanese]

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Author(s)

    • 水野 忠雄 MIZUNO Tadao
    • 京都大学大学院工学研究科附属環境質制御研究センター Research Center for Environmental Quality Control, Kyoto University
    • 山田 春美 YAMADA Harumi
    • 京都大学大学院工学研究科附属環境質制御研究センター Research Center for Environmental Quality Control, Kyoto University
    • 津野 洋 TSUNO Hiroshi
    • 京都大学大学院工学研究科附属環境質制御研究センター Research Center for Environmental Quality Control, Kyoto University

Abstract

Though alkylphenol ethoxylates (APEOs) are hydrophilic, their biologicial degradation by-products, alkylphenols (APs), are hydrophobic and are known to affect the endocrine system. Therefore, it is necessary to decompose the aromatic ring of APs and APEOs before their load to the environment, as the biological decomposition of them is very difficult.<br>In this study, we focused on decomposition characteristics of nonylphenol ethxylates (NPEs) by ozonation (O<sub>3</sub>) and ozone/hydrogen peroxide process (O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub>). Acetate, oxalate, and formate ions were detected as their oxidation by-products. The aromatic ring was easily broken down by O<sub>3</sub> alone, however the higher decomposition ratio of NPEs to acetic acid was achieved by using smaller doses of ozone with hydrogen peroxide. For example, at ozone gas concentration of 1.9mg·<i>l</i><sup>-1</sup>, the ozone dose required to degrade NPEs (10<i>μ</i>M) to acetic acid of 154<i>μ</i>M (<i>i.e</i>., 88% decomposition) was 70<i>μ</i>M O<sub>3</sub> with H<sub>2</sub>O<sub>2</sub> dose of 76<i>μ</i>M, while 392<i>μ</i>M O<sub>3</sub> without H<sub>2</sub>O<sub>2</sub> (O<sub>3</sub> alone).<br>It was confirmed that O<sub>3</sub> and O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub> processes could be used to increase the biodegradability of recalcitrant; smaller doses of ozone can be sufficient to change the structure of the recalcitrant, making it more amenable to bacteriological breakdown.

Journal

  • Journal of Japan Society on Water Environment

    Journal of Japan Society on Water Environment 25(1), 46-52, 2002-01-10

    Japan Society on Water Environment

References:  24

Cited by:  10

Codes

  • NII Article ID (NAID)
    10008006359
  • NII NACSIS-CAT ID (NCID)
    AN10372439
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09168958
  • NDL Article ID
    6042363
  • NDL Source Classification
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL Call No.
    Z16-1045
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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