Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, College of Architectural Engineering, Beijing University of Technology, Beijing 100124, China.
Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, College of Architectural Engineering, Beijing University of Technology, Beijing 100124, China.
Bioresour Technol. 2023 Feb;370:128561. doi: 10.1016/j.biortech.2022.128561. Epub 2022 Dec 29.
A two-stage partial nitritation/anammox process based on microbial encapsulation (PN/A-E) was established. The nitrogen removal characteristics of PN/A-E under high and low ammonia nitrogen and after reactivation following a long-term shutdown were comprehensively investigated and compared with anammox granular sludge (AnGS). The stable PN process did not depend on high ammonia nitrogen, and the nitrite accumulation rate reached 95.2 ± 0.7 %. The overall nitrogen removal rate of encapsulated anammox bacteria was twice that of the AnGS, and it was more tolerant to external interference. Moreover, PN/A-E showed good reactivation performance, and the total nitrogen in the effluent was 10.0 ± 1.4 mg·L when the final hydraulic retention time was 2.18 h. The immobilized fillers support an increase in ammonia-oxidizing bacteria under restricted conditions and were more conducive to the dominance of functional bacteria and the stability of microbial community under low ammonia nitrogen. This study provides a positive method to achieve a reliable PN/A.
建立了基于微生物包埋的两段式部分亚硝化/厌氧氨氧化工艺（PN/A-E）。综合考察了 PN/A-E 在高、低氨氮条件下的脱氮特性以及长期停运后的再激活情况，并与厌氧氨氧化颗粒污泥（AnGS）进行了比较。稳定的 PN 过程不依赖于高氨氮，亚硝酸盐积累率达到 95.2±0.7%。包埋厌氧氨氧化菌的整体脱氮速率是 AnGS 的两倍，并且对外部干扰更具耐受性。此外，PN/A-E 表现出良好的再激活性能，当最终水力停留时间为 2.18 h 时，出水总氮为 10.0±1.4 mg·L。固定化填料在限制条件下支持氨氧化细菌的增加，更有利于功能细菌的优势和低氨氮下微生物群落的稳定性。本研究为实现可靠的 PN/A 提供了一种积极的方法。
