• 关键词：污水生物处理  硝化系统  硝化细菌  衰减速率  活性  耗氧速率

• 基金项目：国家自然科学基金项目(No.50678017);荷兰皇家科学院国际合作项目(No.03CDP008);北京市属市管高等学校人才强教计划资助项目(No.BJE10016200611)

• 郝晓地
• 北京建筑工程学院可持续环境生物技术研发中心, 北京 100044

• 朱景义
• 北京建筑工程学院可持续环境生物技术研发中心, 北京 100044

• 曹秀芹
• 北京建筑工程学院可持续环境生物技术研发中心, 北京 100044

• 曹亚莉
• 北京建筑工程学院可持续环境生物技术研发中心, 北京 100044

• 摘要：污水生物处理过程中由于硝化反应分两步进行,因而对于硝化细菌的衰减速率也应该分别测定.通过实验测定了氨氮氧化细菌(AOB)和亚硝酸氮氧化细菌(NOB)在好氧饥饿状态下的衰减速率.实验结果显示,AOB和NOB具有不同的衰减特征.前者在衰减过程中其活性匀速下降,而后者的活性则是先迅速下降再平缓降低.通过对比分析还发现,SBR系统中AOB和NOB的衰减速率差异较大,而在常规活性污泥系统中AOB和NOB的衰减速率基本相当.

• Abstract：Because nitrification is a two-stage process, the decay rates of Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) need to be separately measured. In this work, the decay rates of both AOB and NOB were experimentally determined under aerobic starvation conditions, using sludge samples from a lab-scale sequencing batch reactor (SBR) nitrifying system. The decay features of AOB are different from those of NOB. The activity of AOB decreased smoothly over the whole decay period, whereas that of NOB dropped sharply within the first day and then became smooth over the following₆ days. Comparatively, the decay rates of AOB and NOB from ordinary activated sludge systems are of the same order of magnitude, but are quite different from those from the SBR nitrifying system.

• Key words：biological wastewater treatment  nitrifying system  AOB and NOB  decay rate  activity  Oxygen Uptake Rate (OUR)

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