短程脱氮中不同分段进水模式下氧化亚氮产量

王莎莎^{1, 2}，汪传新¹，巩有奎¹，杨庆¹，彭永臻¹

(1. 北京工业大学 北京市水质科学与水环境恢复工程重点实验室，北京，100124；
2. 镇江市水业总公司，江苏 镇江，212001)

摘 要：利用SBR反应器，控制曝气量为60 L/h，考察实际生活污水在不同分段进水模式下短程脱氮过程中N₂O的产量。结果表明：N₂O主要产生在硝化阶段；随着分段进水段数的增加，NO₂^-的积累减少。不同进水方式下SBR短程脱氮N₂O产量不同，3种进水方式N₂O产量由小到大顺序为：3次进水，2次进水，1次进水。其原因是由于氨氧化细菌(AOB)主要是以NO₂^-为电子受体，以还原性氢或者氨为电子供体进行好氧反硝化。

关键词：生活污水；NO₂^-；分段进水；N₂O

Production of N₂O of shortcut biological nitrogen removal with different step-feeding modes

WANG Sha-sha^{1, 2}, WANG Chuan-xin¹, GONG You-kui¹, YANG-qing¹, PENG Yong-zhen¹

(1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,
Beijing University of Technology, Beijing 100124, China;
2. Zhenjiang Water Industry Company, Zhenjiang 212001, China)

Abstract:The production of N₂O of domestic sewage with different step-feeding modes was inspected during shortcut biological nitrogen removal. Sequencing batch reactor was used in the experiment and the aeration was controlled at 60 L/h. The results show that N₂O is mainly produced in the nitrification stage; the accumulation of NO₂^- decreases along with the increase of steps. The N₂O output increasing order with different feeding modes is as follows one-step influent, two-step influent, and three-step influent. The reason is that ammonia-oxidizing bacteria used nitrite as electron acceptors and reducing hydrogen or ammonia as electron donors for aerobic denitrification.

Key words:domestic sewage; nitrite; step-feeding; N₂O