成果報告書詳細
管理番号20110000000917
タイトル*平成22年度中間年報 省水型・環境調和型水循環プロジェクト 水循環要素技術研究開発 高効率難分解性物質分解技術の開発 うち難分解性化学物質分解(H21-H23)
公開日2011/7/28
報告書年度2010 - 2010
委託先名住友精密工業株式会社
プロジェクト番号P09011
部署名環境部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 (1)促進酸化処理による実排水中1,4-ジオキサンの分解除去に関する研究開発(住友精密工業(株)) 1)生物処理による分解特性調査 研究目標である1,4-ジオキサン0.5mg/L以下の低減と50%の処理エネルギー低減を達するために、1,4-ジオキサンの分解特性を把握する。 今年度は、文献で生物処理が難しいとされる1,4-ジオキサンについて生物処理を実施した。その結果、汚泥の違いで低減速度が異なっていることがわかった(図1)。これは特別な1,4-ジオキサン分解菌を使用せず、馴養した汚泥でジオキサンが低減したことを意味する。
英文要約This target of investigation is that reductions of both the concentration of 1,4-dioxane to less than 0.5mg/L and the energy required for the new treatment system by 50%.This experiment was performed to evaluate the effects of biological treatment, with industrial waste water contained 1,4-dioxane that is biodegradable. 1,4-dioxane was rapidly decreased by more activated sludge. It shows that, not special bacillus but more activated sludge is effective for this decomposition. 1,4-dioxane was decreased from 500 mg/L to 10mg/L by biological continuous treatment during 4 days and below 0.5mg/L by AOPs treatment. The energy and costs of only ozone treatment, only AOPs and biological-AOPs in systems were calculated. The energy and costs of biological-AOPs is the lowest. Survey was carried out for some model chemical factories' wastewater which contains 1,4-dioxane. To decrease 1,4-dioxane discharge into wastewater, water saving technologies around the manufacturing process in the factory were studied. Four kinds of wastewater and six kinds of new treatment system were investigated and set up with its quantity and quality. Energy consumption amount was calculated not only for the operation period, but for the construction of the treatment plant and for the breaking up of the plant after the life span. Most of the treatment systems which use newly developing technology showed 50% or less energy consumption than conventional system. The investigation of the degradation of 1,4-dioxane showed that the respective methods such as ozonization alone, UV irradiation and hydrogen peroxide can degrade the original structures of 1,4-dioxane and hardly decrease the DOC concentration, and that aeration can release 1,4-dioxane to the air to some extent by increasing the intensity. On the other hand, the investigation also showed that the degradation of 1,4-dioxane was effectively increased by AOPs such as O3/UV and H2O2. That is, in the case of the initial concentration of 150 mg/l, 1,4-dioxane was completely degraded in 60 to 120 min-reaction, and DOC concentration was gradually decreased. These showed the effectiveness of AOPs compared to the respective methods.
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