PN/A工艺在热水解污泥消化液处理工程中的应用研究

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摘要利用短程硝化厌氧氨氧化(PN/A)工艺在北京某污水处理厂成功启动了处理热水解污泥消化液的工程,调试运行结果表明:在接种生物膜填料数占总填料数18%和生物膜上厌氧氨氧化菌(AnAOB)占比为6.8%的情况下可快速启动PN/A系统,并在3个月内可以达到设计处理水量,总氮去除负荷为0.26kg/(m³·d),总氮去除率达到80%以上.通过定量PCR检测和高通量数据发现AOB和AnAOB丰度不同的空间分布特点,项目调试过程中氨氧化菌(ammonia oxidizing bacteria,AOB)和AnAOB均呈稳定增长的趋势,经过3个月启动培养后絮体中AOB丰度达到10¹¹数量级,生物膜中的AnAOB达到10¹²数量级.实际运行数据证明该旁侧处理系统对水厂主流区产生积极影响,可降低日处理量为40×10⁴t的污水厂2.9mg/L的进水总氮.另外,在该项目后期运行过程中出现反应池缺氧段和末端游离氨(free ammonia,FA)浓度不足的情况,导致短程硝化过程不稳定,通过控制反应池首端与末端FA浓度及剩余氨氮浓度,可实现对短程硝化过程的快速恢复.

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	王晓聪
	韩晓宇
	张树军
	李伟
	黄京
	焦佳童
	王倩
	王之敏
	曲之明

关键词 ：污水处理, 厌氧氨氧化, 脱氮, 污泥消化液

Abstract：The partial nitrification-anaerobic ammonium oxidation (PN/A) process was successfully launched in a sewage treatment plant in Beijing for the treatment of sludge-digestion liquid treatment by thermal hydrolysis. The optimal operation conditions were proposed based on the project commissioning. Specifically, the PN/A system could be quickly initiated when the proportion of biofilm-inoculated carrier was 18% of the total carrier and the relative abundance of anaerobic ammonium oxidation bacteria (AnAOB) on the biofilm reached 6.8%. The designed water treatment capacity could be achieved within 3months, where the total nitrogen removal load was 0.26kg/(m³·d) and the total nitrogen removal efficiency reached 80%. Quantitative PCR and high-throughput sequencing analysis showed that different spatial distribution characteristics of AOB and AnAOB abundance, and proportions of both ammonia oxidizing bacteria (AOB) and AnAOB increased steadily during the commissioning; and the respective abundance of AOB in flocs and AnAOB on the biofilm reached the magnitude of 10¹¹ and 10¹² after 3 months of cultivation. Data from practical operation demonstrated that the sidestream treatment system has a positive impact on the mainstream, where a 2.9 mg/L decrease of the total nitrogen was observed with the influent for a sewage treatment plant of 40×10⁴t/d. At the last running stage of the project, an insufficient supply of free ammonia (FA) was observed in the anoxic zone of the reaction tank, which resulted in the unstable performance of the PN/A system. However, the system could be quickly restored by controlling the FA concentration at the beginning and end of the reaction tank and the remaining ammonia nitrogen concentration.

Key words： sewage treatment anammox nitrogen removal sludge-digestion liquid

收稿日期: 2023-11-13

PACS:

X703.1

通讯作者: 韩晓宇,正高级工程师,hanxiaoyu@bdc.cn E-mail: hanxiaoyu@bdc.cn

作者简介: 王晓聪(1994-),男,北京人,工程师,硕士,主要从事高氨氮废水厌氧氨氧化技术研发与应用.发表论文1篇.937532404@qq.com.

引用本文:

王晓聪, 韩晓宇, 张树军, 李伟, 黄京, 焦佳童, 王倩, 王之敏, 曲之明. PN/A工艺在热水解污泥消化液处理工程中的应用研究[J]. 中国环境科学, 2024, 44(7): 3698-3706. WANG Xiao-cong, HAN Xiao-yu, ZHANG Shu-jun, LI Wei, HUANG Jing, JIAO Jia-tong, WANG Qian, WANG Zhi-min, QU Zhi-ming. Research on the application of the PN/A process in projects of sludge-digestion liquid treatment by thermal hydrolysis. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(7): 3698-3706.

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