Du Rui, Li Cong, Peng Yongzhen, Cao Shenbin
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China; College of Architecture and Civil Engineering, Faculty of Architecture, Civil and Transportation Engineering (FACTE), Beijing University of Technology, Beijing 100124, PR China; Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, Garching 85748, Germany.
Bioresour Technol. 2023 Feb;369:128460. doi: 10.1016/j.biortech.2022.128460. Epub 2022 Dec 9.
Partial denitrification (PD) is another important pathway producing nitrite for anammox, however, whether its performance is affected by overlong reaction time, a situation that often takes place is still unknown. Three sequencing batch reactors were operated for PD to evaluate this factor on nitrite production. Results indicated effluent nitrite was very close despite reaction time even extending to four times longer than control (i.e., nitrate-to-nitrite transformation ratio (NTR) of 94.4%-89.8%). Meanwhile, it was found PD could recover to the normal after suffering from high organics shocking. Cycle studies suggested produced nitrite would not be further reduced with prolonged time, as indicated by changing trend of pH and alkalinity. Microbial analysis revealed PD functional bacteria, Thauera, slightly decreased with prolonged reaction, while it was always predominated. Taken together, this study indicated overlong reaction time had minor influence on PD, demonstrating its robustness with great technological superiority in supplying nitrite for anammox.
部分反硝化作用（PD）是为厌氧氨氧化产生亚硝酸盐的另一条重要途径，然而，其性能是否会受到过长反应时间的影响（这种情况经常发生）仍不清楚。运行了三个序批式反应器进行部分反硝化作用，以评估该因素对亚硝酸盐产生的影响。结果表明，尽管反应时间延长至对照的四倍（即硝酸盐到亚硝酸盐的转化率（NTR）为94.4%-89.8%），出水亚硝酸盐仍非常接近。同时，发现部分反硝化作用在遭受高有机物冲击后能够恢复正常。循环研究表明，随着时间延长，产生的亚硝酸盐不会进一步减少，这从pH值和碱度的变化趋势可以看出。微生物分析显示，部分反硝化作用的功能菌陶厄氏菌属（Thauera）随着反应时间延长略有减少，但它始终占主导地位。综上所述，本研究表明过长的反应时间对部分反硝化作用影响较小，证明了其在为厌氧氨氧化提供亚硝酸盐方面具有强大的技术优势和稳健性。
