Characteristics of Nitrous Oxide Production Originated from Aerobic Denitrification of Nitrite by Poly-Phosphate Accumulating Organisms

聚磷酸盐积累生物亚硝酸盐好氧反硝化产一氧化二氮的特性

• 批准号: 21510089
• 负责人: SAITO Toshiaki
• 金额: $ 2.75万
• 依托单位: Nihon University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21510089/
• 关键词: 環境負荷低減技術; ポリリン酸蓄積細菌; 亜酸化窒素; 排水処理; 好気脱窒; 温室効果ガス; 亜硝酸; 溶存酸素; 地球温暖化; 活性汚泥; 包括酸素移動容量係数

Potentials of Nitrous Oxide(N_2O) production by Poly-Phosphate Accumulating Organisms(PAOs) were examined to reduce N_2O emission from wastewater treatment plants. Acetic acid, peptone and their mixture were used as organic substrates to cultivate the sludge enriched with different types of PAOs having different denitrification capability. Several findings were obtained as follows ; 1) Rhodocyclus-related PAO(R-PAO) can denitrify nitrite aerobically and produces N_2O as one of some final products. On the other hands, Actinobacteria-related PAO(A-PAO) does have little aerobic denitrification capability, hence, N_2O production is negligible. 2) Influencing factors on N_2O production by R-PAO are nitrite concentration, partial pressure of oxygen, and denitrification capability of R-PAO. The high nitrite concentration causes the higher aerobic denitrification rate of nitrite and the higher nitrite conversion to N_2O. The higher partial pressure of oxygen results in the higher nitrite conversion to N_2O and the lower aerobic denitrification rate of nitrite. Hence, the N_2O production rate depends on their balance. The higher denitrification capability of R-PAO results in the higher aerobic denitrification rate of nitrite and the lower nitrite conversion to N_2O. Hence, the N_2O production rate also depends on their balance.

为减少污水处理厂N_2O排放，研究了聚磷菌（PAOs）产生N_2O的潜力。以乙酸、蛋白胨及其混合物为有机基质，培养富含不同类型反硝化能力的聚磷菌的污泥。研究结果表明：1）红环菌相关的PAO（R-PAO）能好氧降解亚硝酸盐，最终产物为N_2O。而放线菌相关的聚磷菌（A-PAO）则不具备好氧反硝化能力，因此N_2O的产生量可以忽略不计。2)影响R-PAO产N_2O的因素有亚硝酸盐浓度、氧分压和R-PAO的反硝化能力。亚硝酸盐浓度越高，亚硝酸盐的好氧反硝化速率越高，亚硝酸盐转化为N_2O的速率也越高。氧分压越高，亚硝酸盐转化为N_2O的转化率越高，亚硝酸盐的好氧反硝化速率越低。因此，N_2O的产生速率取决于它们之间的平衡。R-PAO的反硝化能力越强，亚硝酸盐的好氧反硝化速率越高，亚硝酸盐转化为N_2O的速率越低。因此，N_2O的产生速率也取决于二者的平衡。

项目成果

リン蓄積細菌の亜酸化窒素生成に及ぼす溶存酸素濃度の影響

溶解氧浓度对富磷细菌产生一氧化二氮的影响

• 发表时间: 2010
• 作者: Iwabuchi N;et al;齋藤利晃
• 通讯作者: 齋藤利晃

活性汚泥中のアンモニア酸化細菌による亜酸化窒素生成条件の検討

活性污泥中氨氧化细菌产生一氧化二氮的条件研究

• 发表时间: 2010
• 作者: 齋藤利晃;平井鐘太郎;大嶽祐介;鈴木重浩
• 通讯作者: 鈴木重浩