LIUXin-yi,LIWen-qian,CAIQin,et al.Research Advancement in Common NOB Suppression Strategies in One?stage PN/A System[J].China Water & Wastewater,2023,39(8):23-32.
Research Advancement in Common NOB Suppression Strategies in One?stage PN/A System
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第8期
Page:
23-32
Column:
Date of publication:
2023-04-17
- Keywords:
- Anammox; one-stage PN/A; nitrite accumulation; NOB suppression
- Abstract:
- Anammox is the most potential, low-energy consuming and efficient biological denitrification technology for wastewater. One-stage partial nitritation/Anammox (one-stage PN/A) system is commonly used in Anammox and partial nitrification is the key step to provide substrate nitrite for Anammox. The presence of nitrite oxidizing bacteria (NOB) may consume a large amount of nitrite, leading to the unstable operation of PN/A system. Therefore, the methods for NOB suppression have become a hot research topic. Two common NOB in wastewater treatment plants were introduced, and several common NOB suppression strategies were discussed in detail. The inhibition thresholds of free ammonia (FA) and free nitrous acid (FNA) on NOB and other functional bacteria were summarized, and the alternative treatment of FA and FNA and their application in sidestream treatment were discussed. The aeration strategies include adjusting dissolved oxygen, intermittent aeration as well as real-time control, and the setting of specific parameters has a great impact on NOB suppression. Sludge retention time (SRT) control of biofilm and granular sludge that are commonly used in one-stage PN/A system can effectively wash out NOB enriched in floc sludge. Finally, some suggestions for future NOB suppression strategies were proposed.
Last Update:
2023-04-17