微生物の無毒化作用による新たなセレン処理プロセスの開発

利用微生物解毒作用开发硒处理新工艺

• 批准号: 15H00299
• 负责人: 國分 修三
• 金额: $ 0.32万
• 依托单位: Oita University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Encouragement of Scientists
• 财政年份: 2015
• 资助国家: 日本
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15H00299/
• 关键词: セレン; 生物学的廃水処理; 環境技術

研究目的廃水処理におけるセレンの無毒化を行う処理方法に、低コストが期待され、二次汚染の心配がないバイオレメディエーションに着目した。この方法は微生物により、セレン酸および亜セレン酸を毒性の弱い元素態セレンに還元するものである。本研究ではこのうち比較的反応が速い元素態セレンへの異化還元を対象として、生物処理について検討を行い、実排水である石炭火力発電所における脱硫廃水に含まれるセレンの除去についてアプローチする。研究実施計画および研究結果セレン還元菌の入手が困難なことから、活性汚泥を元汚泥として亜セレン酸とセレン酸で馴養(純粋培養)することにより、低コストで2種類のセレン還元汚泥を得る。この汚泥を用いてセレンの無毒化を行う処理方法の検討を行った。・セレン還元汚泥による温度依存性、pH依存性の検討馴養で得られた2種類の汚泥を使用したセレン還元反応は0次的還元反応であることが判明した。還元速度の温度依存性についてアレニウスプロットで整理した結果、いずれも良好な直線が得られた。求められた活性化エネルギーは亜セレン酸の還元では約70kJ、セレン酸の還元では約40kJを示した。pH依存性については、亜セレン酸還元においてはpH≒7.2付近で最大値を示すベル型の依存性が得られた。一方、セレン酸還元においては、亜セレン酸還元と異なり酸性域で速度が上昇する傾向を示し、ベル型の依存性は見られなかった。温度依存性ならびにpH依存性の結果から、亜セレン酸とセレン酸の還元挙動に差があるため、それぞれの還元に関わる菌体が異なる可能性も示唆された。・セレン還元汚泥による硝酸態窒素共存時のセレン還元挙動の検討Se(VI)の還元は硝酸態窒による阻害を受けずに進行した。Se(VI)汚泥によるSe(IV)の還元は硝酸態窒濃度が高いほど影響を受け、20mg-N/ℓ共存時にはほぼ完全にSe(IV)の還元反応が停止した。これらより、硝酸態窒素共存時の亜セレン酸とセレン酸の還元阻害の受け方の違いは、馴養時に使用した溶解性セレンの違いによってもたらされたものと考えられる。

The purpose of the study is to study the method of non-toxic treatment, and the second treatment. The method is based on the determination of microorganisms, acid, toxicity, weak elements, state, and so on. In this study, the results show that there are significant differences in the quality of the elements in this study. The results are as follows: in this study, the results of the study are as follows: in this study, the results of this study are as follows: in this study, there are significant differences in the characteristics of the elements in this study, such as chemical reaction, biological analysis, thermal analysis, and so on. the desulphurization water of the charcoal firepower plant contains the chemical compound, which is used to remove the temperature. The results of the study were compared with the results of the study. The results of the study showed that there were significant differences between the two groups in terms of the results of the study, the results of the study showed In this way, you can use the non-toxic method to make sure that you are not poisoned. Based on the temperature dependence and pH dependence, the temperature dependence and the pH dependence on the temperature and the temperature dependence on the temperature, the temperature dependence and the temperature dependence on the temperature dependence, the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the temperature dependence and the temperature dependence on the The speed is temperature dependent, the temperature is dependent, and the results are in good order. The results show that the straight line is good. Please make sure that you can reduce the amount of 70kJ and 40kJ by reducing the amount of acid. The pH dependence test and pH reduction test show that there is a significant difference between the two types of dependence. On the one hand, the temperature of the acid is higher than that of the acid, the speed of the acid domain is higher than that of the acid domain, and the dependence of the acid on the temperature is different. Temperature dependence test pH dependence test results, temperature dependence test, temperature dependence, temperature dependence, temperature dependence, In the presence of nitric acid asphyxiant, it is necessary to determine the amount of Se (VI) and nitric acid to prevent the damage caused by nitrate. Se (VI), Se (IV), nitric acid, nitric In the case of the coexistence of asphyxiant nitrate and asphyxiant nitrate, it is necessary to prevent the affected party from being affected by the presence of asphyxiant nitrate, and the use of chemical solubility compounds in the presence of sodium chloride and asphyxiant nitrate.