Enhancing nitrogen removal through directly integrating anammox into mainstream wastewater treatment: Advantageous, issues and future study

• Published in: Bioresource technology 2022-10, Vol.362, p.127827-127827, Article 127827
• Main Authors: Zhang, Liang, Jiang, Ling, Zhang, Jiangtao, Li, Jialin, Peng, Yongzhen
• Format: Article
• Language: English
• Subjects: Engineering; Mainstream; Nitrogen removal; Partial anammox; WWTP
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2022.127827

[Display omitted] •Anammox bacteria exist in conventional processes wide from 107–1010 copies/g VSS.•In-situ enrich anammox bacteria by adding carriers and controlling DO/organics.•Anammox coupled with denitridation/nitritation conducts partial mainstream anammox.•Contribution of mainstream anammox needs to enhance to 15%.•Novel technologies and control strategies for enhancing anammox need to explore. Anaerobic ammonium oxidation (anammox) has great potential to be applied to the process of nitrogen removal from mainstream wastewater. However, directly applying complete anammox to the mainstream is typically hindered by low temperatures, a low ammonia concentration, and high organic matter concentrations. Directly integrating anammox into mainstream treatment by enhancing the in-situ enrichment of anammox bacteria in wastewater treatment plants (WWTPs) could effectively improve the nitrogen removal efficiency and reduce the treatment cost. A certain anammox bacteria abundance in full-scale WWTPs provides the feasibility of directly integrating anammox into mainstream treatment and realizing partial mainstream anammox. The technical development status of partial anammox and the mechanisms of achieving partial mainstream anammox by aeration and organic control are summarized. This review provides an enhanced understanding of this novel technical route of partial mainstream anammox treatment for improving the quality, performance, and prospects for this technology to be used in upgrading WWTPs.