侧流FNA处理的CANON工艺恢复策略及脱氮路径

任志强; 李冬; 张杰

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中国环境科学 ›› 2022, Vol. 42 ›› Issue (10) : 4588-4595.

水污染与控制

侧流FNA处理的CANON工艺恢复策略及脱氮路径

任志强¹, 李冬¹, 张杰^1,2

作者信息 +

CANON process recovery strategy and nitrogen removal pathway for side flow FNA treatment

REN Zhi-qiang¹, LI Dong¹, ZHANG Jie^1,2

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文章历史 +

摘要

为探究侧流游离亚硝酸（FNA）处理后的颗粒-絮体污泥全程自养脱氮（CANON）工艺重新建立的有效策略，采用序批式反应器（SBR）进行实验，探讨不同恢复方式对系统长期运行性能的影响，实现CANON工艺长期稳定运行.结果显示，不同恢复方式对CANON系统重新建立有很大影响，采用非原位高曝气恢复策略的R1经过19d的运行重新建立了稳定的CANON工艺，而采用原位低曝气恢复策略的R2和原位高曝气恢复策略的R3均未能有效重新建立稳定的CANON工艺.R1稳定运行34d时再次出现了亚硝酸盐氧化菌（NOB）增殖的现象.定期水力筛分排出絮状污泥进行FNA处理，达到溶解氧（DO）控制+侧流FNA处理的“双抑制”，能够有效抑制NOB实现CANON工艺的长期稳定运行.典型周期分析结果表明，在恢复过程中，R1内氨氧化菌（AOB）、厌氧氨氧化菌（AnAOB）活性均高于R2和R3，并且有效抑制了反应器内残余NOB的活性.随着R1中CANON工艺的重新建立，亚硝化/厌氧氨氧化（SNA）脱氮路径占比由第15d的8.91%增加到了第45d的19.39%，提高了NH₄⁺-N的去除率.

Abstract

In order to explore an effective strategy for the re-establishment of the granular-flocculation sludge completely autotrophic nitrogenremoval over nitrite (CANON) process after the side flow free nitric acid (FNA) treatment, the sequence batch reactors (SBR) reactor was used to conduct experiments to explore the influence of different recovery methods on the long-term operation performance of the system, so as to realize the long-term stable operation of the CANON process. Different recovery methods had a great impact on the reconstruction of the CANON system. The R1using the ex-situ high aeration recovery strategy re-established a stable CANON process after 19days of operation, while the in-situ low aeration recovery strategy was used. Neither R2nor R3with an in-situ high aeration recovery strategy was able to effectively re-establish a stable CANON process. When R1ran stably for 34days, nitrite oxidizing bacteria (NOB) proliferation appeared again. Regular hydraulic sieving to discharge flocculent sludge for FNA treatment to achieve the "double suppression" of dissolved oxygen (DO) control + side flow FNA treatment, which can effectively suppress NOB and achieve long-term stable operation of CANON process. Typical cycle analysis results showed that during the recovery process, the activities of ammonia oxidizing bacteria (AOB) and anaerobic ammonia oxidizing bacteria (AnAOB) in R1 were higher than those in R2 and R3, and the activity of residual NOB in the reactor was effectively inhibited. With the re-establishment of the CANON process in R1, the proportion of simultaneous nitrosation and anaerobic ammonia oxidation (SNA) denitrification pathway increased from 8.91% on the 15th day to 19.39% on the 45th day, which improved the removal rate of NH₄⁺-N.

导出引用

任志强, 李冬, 张杰. 侧流FNA处理的CANON工艺恢复策略及脱氮路径[J]. 中国环境科学. 2022, 42(10): 4588-4595

REN Zhi-qiang, LI Dong, ZHANG Jie. CANON process recovery strategy and nitrogen removal pathway for side flow FNA treatment[J]. China Environmental Science. 2022, 42(10): 4588-4595

中图分类号： X703.1

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